Remove interpreter paths and enforce bytecode-only execution

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/fs/LyngFsModule.kt

@@ -23,6 +23,8 @@ package net.sergeych.lyng.io.fs
 
 import net.sergeych.lyng.ModuleScope
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.miniast.*
 import net.sergeych.lyng.obj.*
 import net.sergeych.lyng.pacman.ImportManager
@@ -437,7 +439,7 @@ private suspend fun buildFsModule(module: ModuleScope, policy: FsAccessPolicy) {
             moduleName = module.packageName
         ) {
             fsGuard {
-                val chunkIt = thisObj.invokeInstanceMethod(this, "readUtf8Chunks")
+                val chunkIt = thisObj.invokeInstanceMethod(requireScope(), "readUtf8Chunks")
                 ObjFsLinesIterator(chunkIt)
             }
         }
@@ -463,7 +465,7 @@ private suspend fun buildFsModule(module: ModuleScope, policy: FsAccessPolicy) {
 
 // --- Helper classes and utilities ---
 
-private fun parsePathArg(scope: Scope, self: ObjPath, arg: Obj): LyngPath {
+private fun parsePathArg(scope: ScopeFacade, self: ObjPath, arg: Obj): LyngPath {
     return when (arg) {
         is ObjString -> arg.value.toPath()
         is ObjPath -> arg.path
@@ -472,11 +474,11 @@ private fun parsePathArg(scope: Scope, self: ObjPath, arg: Obj): LyngPath {
 }
 
 // Map Fs access denials to Lyng runtime exceptions for script-friendly errors
-private suspend inline fun Scope.fsGuard(crossinline block: suspend () -> Obj): Obj {
+private suspend inline fun ScopeFacade.fsGuard(crossinline block: suspend () -> Obj): Obj {
     return try {
         block()
     } catch (e: AccessDeniedException) {
-        raiseError(ObjIllegalOperationException(this, e.reasonDetail ?: "access denied"))
+        raiseError(ObjIllegalOperationException(requireScope(), e.reasonDetail ?: "access denied"))
     }
 }
 
@@ -668,16 +670,17 @@ class ObjFsLinesIterator(
         }
     }
 
-    private suspend fun ensureBufferFilled(scope: Scope) {
+    private suspend fun ensureBufferFilled(scope: ScopeFacade) {
         if (buffer.contains('\n') || exhausted) return
+        val actualScope = scope.requireScope()
         // Pull next chunk from the underlying iterator
-        val it = chunksIterator.invokeInstanceMethod(scope, "iterator")
+        val it = chunksIterator.invokeInstanceMethod(actualScope, "iterator")
-        val hasNext = it.invokeInstanceMethod(scope, "hasNext").toBool()
+        val hasNext = it.invokeInstanceMethod(actualScope, "hasNext").toBool()
         if (!hasNext) {
             exhausted = true
             return
         }
-        val next = it.invokeInstanceMethod(scope, "next")
+        val next = it.invokeInstanceMethod(actualScope, "next")
         buffer += next.toString()
     }
 }

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/process/LyngProcessModule.kt

@@ -20,6 +20,8 @@ package net.sergeych.lyng.io.process
 import kotlinx.coroutines.flow.Flow
 import net.sergeych.lyng.ModuleScope
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.miniast.*
 import net.sergeych.lyng.obj.*
 import net.sergeych.lyng.pacman.ImportManager
@@ -204,20 +206,21 @@ class ObjRunningProcess(
     override fun toString(): String = "RunningProcess($process)"
 }
 
-private suspend inline fun Scope.processGuard(crossinline block: suspend () -> Obj): Obj {
+private suspend inline fun ScopeFacade.processGuard(crossinline block: suspend () -> Obj): Obj {
     return try {
         block()
     } catch (e: ProcessAccessDeniedException) {
-        raiseError(ObjIllegalOperationException(this, e.reasonDetail ?: "process access denied"))
+        raiseError(ObjIllegalOperationException(requireScope(), e.reasonDetail ?: "process access denied"))
     } catch (e: Exception) {
-        raiseError(ObjIllegalOperationException(this, e.message ?: "process error"))
+        raiseError(ObjIllegalOperationException(requireScope(), e.message ?: "process error"))
     }
 }
 
-private fun Flow<String>.toLyngFlow(flowScope: Scope): ObjFlow {
+private fun Flow<String>.toLyngFlow(flowScope: ScopeFacade): ObjFlow {
-    val producer = ObjNativeCallable {
+    val producer = net.sergeych.lyng.obj.ObjExternCallable.fromBridge {
-        val builder = (this as? net.sergeych.lyng.BytecodeClosureScope)?.callScope?.thisObj as? ObjFlowBuilder
+        val scope = requireScope()
-            ?: this.thisObj as? ObjFlowBuilder
+        val builder = (scope as? net.sergeych.lyng.BytecodeClosureScope)?.callScope?.thisObj as? ObjFlowBuilder
+            ?: scope.thisObj as? ObjFlowBuilder
 
         this@toLyngFlow.collect {
             try {
@@ -229,5 +232,5 @@ private fun Flow<String>.toLyngFlow(flowScope: Scope): ObjFlow {
         }
         ObjVoid
     }
-    return ObjFlow(producer, flowScope)
+    return ObjFlow(producer, flowScope.requireScope())
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/BlockStatement.kt

@@ -28,7 +28,7 @@ class BlockStatement(
     override val pos: Pos = startPos
 
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "block statement")
+        return bytecodeOnly(scope, "block statement")
     }
 
     fun statements(): List<Statement> = block.debugStatements()

lynglib/src/commonMain/kotlin/net/sergeych/lyng/ClassInstanceDeclStatements.kt

@@ -24,7 +24,7 @@ class ClassInstanceInitDeclStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "class instance init declaration")
+        return bytecodeOnly(scope, "class instance init declaration")
     }
 }
 
@@ -42,7 +42,7 @@ class ClassInstanceFieldDeclStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "class instance field declaration")
+        return bytecodeOnly(scope, "class instance field declaration")
     }
 }
 
@@ -61,7 +61,7 @@ class ClassInstancePropertyDeclStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "class instance property declaration")
+        return bytecodeOnly(scope, "class instance property declaration")
     }
 }
 
@@ -79,6 +79,6 @@ class ClassInstanceDelegatedDeclStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "class instance delegated declaration")
+        return bytecodeOnly(scope, "class instance delegated declaration")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/ClosureScope.kt

@@ -23,7 +23,7 @@ import net.sergeych.lyng.obj.ObjRecord
 /**
  * Bytecode-oriented closure scope that keeps the call scope parent chain for stack traces
  * while carrying the lexical closure for `this` variants and module resolution.
- * Unlike interpreter closure scopes, it does not override name lookup.
+ * Unlike legacy closure scopes, it does not override name lookup.
  */
 class BytecodeClosureScope(
     val callScope: Scope,

lynglib/src/commonMain/kotlin/net/sergeych/lyng/DelegatedVarDeclStatement.kt

@@ -32,6 +32,6 @@ class DelegatedVarDeclStatement(
     override val pos: Pos = startPos
 
     override suspend fun execute(context: Scope): Obj {
-        return interpreterDisabled(context, "delegated var declaration")
+        return bytecodeOnly(context, "delegated var declaration")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/DestructuringVarDeclStatement.kt

@@ -29,6 +29,6 @@ class DestructuringVarDeclStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(context: Scope): Obj {
-        return interpreterDisabled(context, "destructuring declaration")
+        return bytecodeOnly(context, "destructuring declaration")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/EnumDeclStatement.kt

@@ -28,7 +28,7 @@ class EnumDeclStatement(
     override val pos: Pos = startPos
 
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "enum declaration")
+        return bytecodeOnly(scope, "enum declaration")
     }
 
     override suspend fun callOn(scope: Scope): Obj {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/ExtensionPropertyDeclStatement.kt

@@ -29,6 +29,6 @@ class ExtensionPropertyDeclStatement(
     override val pos: Pos = startPos
 
     override suspend fun execute(context: Scope): Obj {
-        return interpreterDisabled(context, "extension property declaration")
+        return bytecodeOnly(context, "extension property declaration")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/RegexCache.kt

@@ -20,7 +20,7 @@ package net.sergeych.lyng
 /**
  * Tiny, size-bounded cache for compiled Regex patterns. Activated only when [PerfFlags.REGEX_CACHE] is true.
  * This is a very simple FIFO-ish cache sufficient for micro-benchmarks and common repeated patterns.
- * Not thread-safe by design; the interpreter typically runs scripts on confined executors.
+ * Not thread-safe by design; the runtime typically runs scripts on confined executors.
  */
 object RegexCache {
     private const val MAX = 64
@@ -48,4 +48,4 @@ object RegexCache {
     }
 
     fun clear() = map.clear()
-}
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Scope.kt

@@ -725,7 +725,7 @@ open class Scope(
         return ns.objClass
     }
 
-    inline fun addVoidFn(vararg names: String, crossinline fn: suspend Scope.() -> Unit) {
+    inline fun addVoidFn(vararg names: String, crossinline fn: suspend ScopeFacade.() -> Unit) {
         addFn(*names) {
             fn(this)
             ObjVoid
@@ -741,8 +741,8 @@ open class Scope(
         return CmdDisassembler.disassemble(bytecode)
     }
 
-    fun addFn(vararg names: String, callSignature: CallSignature? = null, fn: suspend Scope.() -> Obj) {
+    fun addFn(vararg names: String, callSignature: CallSignature? = null, fn: suspend ScopeFacade.() -> Obj) {
-        val newFn = net.sergeych.lyng.obj.ObjNativeCallable { fn() }
+        val newFn = net.sergeych.lyng.obj.ObjExternCallable.fromBridge { fn() }
         for (name in names) {
             addItem(
                 name,

lynglib/src/commonMain/kotlin/net/sergeych/lyng/ScopeFacade.kt

@@ -18,6 +18,7 @@ package net.sergeych.lyng
 
 import net.sergeych.lyng.obj.Obj
 import net.sergeych.lyng.obj.ObjRecord
+import net.sergeych.lyng.obj.ObjString
 
 /**
  * Limited facade for Kotlin bridge callables.
@@ -31,11 +32,20 @@ interface ScopeFacade {
     suspend fun resolve(rec: ObjRecord, name: String): Obj
     suspend fun assign(rec: ObjRecord, name: String, newValue: Obj)
     fun raiseError(message: String): Nothing
+    fun raiseError(obj: net.sergeych.lyng.obj.ObjException): Nothing
+    fun raiseClassCastError(message: String): Nothing
+    fun raiseIllegalArgument(message: String): Nothing
+    fun raiseNoSuchElement(message: String = "No such element"): Nothing
     fun raiseSymbolNotFound(name: String): Nothing
     fun raiseIllegalState(message: String = "Illegal argument error"): Nothing
+    fun raiseNotImplemented(what: String = "operation"): Nothing
+    suspend fun call(callee: Obj, args: Arguments = Arguments.EMPTY, newThisObj: Obj? = null): Obj
+    suspend fun toStringOf(obj: Obj, forInspect: Boolean = false): ObjString
+    suspend fun inspect(obj: Obj): String
+    fun trace(text: String = "")
 }
 
-internal class ScopeBridge(private val scope: Scope) : ScopeFacade {
+internal class ScopeBridge(internal val scope: Scope) : ScopeFacade {
     override val args: Arguments
         get() = scope.args
     override var pos: Pos
@@ -48,6 +58,50 @@ internal class ScopeBridge(private val scope: Scope) : ScopeFacade {
     override suspend fun resolve(rec: ObjRecord, name: String): Obj = scope.resolve(rec, name)
     override suspend fun assign(rec: ObjRecord, name: String, newValue: Obj) = scope.assign(rec, name, newValue)
     override fun raiseError(message: String): Nothing = scope.raiseError(message)
+    override fun raiseError(obj: net.sergeych.lyng.obj.ObjException): Nothing = scope.raiseError(obj)
+    override fun raiseClassCastError(message: String): Nothing = scope.raiseClassCastError(message)
+    override fun raiseIllegalArgument(message: String): Nothing = scope.raiseIllegalArgument(message)
+    override fun raiseNoSuchElement(message: String): Nothing = scope.raiseNoSuchElement(message)
     override fun raiseSymbolNotFound(name: String): Nothing = scope.raiseSymbolNotFound(name)
     override fun raiseIllegalState(message: String): Nothing = scope.raiseIllegalState(message)
+    override fun raiseNotImplemented(what: String): Nothing = scope.raiseNotImplemented(what)
+    override suspend fun call(callee: Obj, args: Arguments, newThisObj: Obj?): Obj {
+        return callee.callOn(scope.createChildScope(scope.pos, args = args, newThisObj = newThisObj))
+    }
+    override suspend fun toStringOf(obj: Obj, forInspect: Boolean): ObjString = obj.toString(scope, forInspect)
+    override suspend fun inspect(obj: Obj): String = obj.inspect(scope)
+    override fun trace(text: String) = scope.trace(text)
 }
+
+inline fun <reified T : Obj> ScopeFacade.requiredArg(index: Int): T {
+    if (args.list.size <= index) raiseError("Expected at least ${index + 1} argument, got ${args.list.size}")
+    return (args.list[index].byValueCopy() as? T)
+        ?: raiseClassCastError("Expected type ${T::class.simpleName}, got ${args.list[index]::class.simpleName}")
+}
+
+inline fun <reified T : Obj> ScopeFacade.requireOnlyArg(): T {
+    if (args.list.size != 1) raiseError("Expected exactly 1 argument, got ${args.list.size}")
+    return requiredArg(0)
+}
+
+fun ScopeFacade.requireExactCount(count: Int) {
+    if (args.list.size != count) {
+        raiseError("Expected exactly $count arguments, got ${args.list.size}")
+    }
+}
+
+fun ScopeFacade.requireNoArgs() {
+    if (args.list.isNotEmpty()) {
+        raiseError("This function does not accept any arguments")
+    }
+}
+
+inline fun <reified T : Obj> ScopeFacade.thisAs(): T {
+    val obj = thisObj
+    return (obj as? T) ?: raiseClassCastError(
+        "Cannot cast ${obj.objClass.className} to ${T::class.simpleName}"
+    )
+}
+
+fun ScopeFacade.requireScope(): Scope =
+    (this as? ScopeBridge)?.scope ?: raiseIllegalState("ScopeFacade requires ScopeBridge")

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt

@@ -90,7 +90,7 @@ class Script(
             }
         }
         if (statements.isNotEmpty()) {
-            scope.raiseIllegalState("interpreter execution is not supported; missing module bytecode")
+            scope.raiseIllegalState("bytecode-only execution is required; missing module bytecode")
         }
         return ObjVoid
     }
@@ -212,15 +212,15 @@ class Script(
             addConst("Unset", ObjUnset)
             addFn("print") {
                 for ((i, a) in args.withIndex()) {
-                    if (i > 0) print(' ' + a.toString(this).value)
+                    if (i > 0) print(' ' + toStringOf(a).value)
-                    else print(a.toString(this).value)
+                    else print(toStringOf(a).value)
                 }
                 ObjVoid
             }
             addFn("println") {
                 for ((i, a) in args.withIndex()) {
-                    if (i > 0) print(' ' + a.toString(this).value)
+                    if (i > 0) print(' ' + toStringOf(a).value)
-                    else print(a.toString(this).value)
+                    else print(toStringOf(a).value)
                 }
                 println()
                 ObjVoid
@@ -233,7 +233,7 @@ class Script(
                 } else {
                     Arguments.EMPTY
                 }
-                callee.callOn(createChildScope(pos, args = rest))
+                call(callee, rest)
             }
             addFn("floor") {
                 val x = args.firstAndOnly()
@@ -331,12 +331,12 @@ class Script(
                 
                 var result = value
                 if (range.start != null && !range.start.isNull) {
-                    if (result.compareTo(this, range.start) < 0) {
+                    if (result.compareTo(requireScope(), range.start) < 0) {
                         result = range.start
                     }
                 }
                 if (range.end != null && !range.end.isNull) {
-                    val cmp = range.end.compareTo(this, result)
+                    val cmp = range.end.compareTo(requireScope(), result)
                     if (range.isEndInclusive) {
                         if (cmp < 0) result = range.end
                     } else {
@@ -359,20 +359,20 @@ class Script(
             addVoidFn("assert") {
                 val cond = requiredArg<ObjBool>(0)
                 val message = if (args.size > 1)
-                    ": " + (args[1] as Obj).callOn(this).toString(this).value
+                    ": " + toStringOf(call(args[1] as Obj)).value
                 else ""
                 if (!cond.value == true)
-                    raiseError(ObjAssertionFailedException(this, "Assertion failed$message"))
+                    raiseError(ObjAssertionFailedException(requireScope(), "Assertion failed$message"))
             }
 
             addVoidFn("assertEquals") {
                 val a = requiredArg<Obj>(0)
                 val b = requiredArg<Obj>(1)
-                if (a.compareTo(this, b) != 0)
+                if (a.compareTo(requireScope(), b) != 0)
                     raiseError(
                         ObjAssertionFailedException(
-                            this,
+                            requireScope(),
-                            "Assertion failed: ${a.inspect(this)} == ${b.inspect(this)}"
+                            "Assertion failed: ${inspect(a)} == ${inspect(b)}"
                         )
                     )
             }
@@ -380,22 +380,22 @@ class Script(
             addVoidFn("assertEqual") {
                 val a = requiredArg<Obj>(0)
                 val b = requiredArg<Obj>(1)
-                if (a.compareTo(this, b) != 0)
+                if (a.compareTo(requireScope(), b) != 0)
                     raiseError(
                         ObjAssertionFailedException(
-                            this,
+                            requireScope(),
-                            "Assertion failed: ${a.inspect(this)} == ${b.inspect(this)}"
+                            "Assertion failed: ${inspect(a)} == ${inspect(b)}"
                         )
                     )
             }
             addVoidFn("assertNotEquals") {
                 val a = requiredArg<Obj>(0)
                 val b = requiredArg<Obj>(1)
-                if (a.compareTo(this, b) == 0)
+                if (a.compareTo(requireScope(), b) == 0)
                     raiseError(
                         ObjAssertionFailedException(
-                            this,
+                            requireScope(),
-                            "Assertion failed: ${a.inspect(this)} != ${b.inspect(this)}"
+                            "Assertion failed: ${inspect(a)} != ${inspect(b)}"
                         )
                     )
             }
@@ -428,7 +428,7 @@ class Script(
                     else -> raiseIllegalArgument("Expected 1 or 2 arguments, got ${args.size}")
                 }
                 val result = try {
-                    code.callOn(this)
+                    call(code)
                     null
                 } catch (e: ExecutionError) {
                     e.errorObject
@@ -437,7 +437,7 @@ class Script(
                 }
                 if (result == null) raiseError(
                     ObjAssertionFailedException(
-                        this,
+                        requireScope(),
                         "Expected exception but nothing was thrown"
                     )
                 )
@@ -451,7 +451,7 @@ class Script(
             }
 
             addFn("dynamic", callSignature = CallSignature(tailBlockReceiverType = "DelegateContext")) {
-                ObjDynamic.create(this, requireOnlyArg())
+                ObjDynamic.create(requireScope(), requireOnlyArg())
             }
 
             val root = this
@@ -468,7 +468,7 @@ class Script(
                 val condition = requiredArg<ObjBool>(0)
                 if (!condition.value) {
                     var message = args.list.getOrNull(1)
-                    if (message is Obj && message.objClass == Statement.type) message = message.callOn(this)
+                    if (message is Obj && message.objClass == Statement.type) message = call(message)
                     raiseIllegalArgument(message?.toString() ?: "requirement not met")
                 }
                 ObjVoid
@@ -477,26 +477,26 @@ class Script(
                 val condition = requiredArg<ObjBool>(0)
                 if (!condition.value) {
                     var message = args.list.getOrNull(1)
-                    if (message is Obj && message.objClass == Statement.type) message = message.callOn(this)
+                    if (message is Obj && message.objClass == Statement.type) message = call(message)
                     raiseIllegalState(message?.toString() ?: "check failed")
                 }
                 ObjVoid
             }
             addFn("traceScope") {
-                this.trace(args.getOrNull(0)?.toString() ?: "")
+                trace(args.getOrNull(0)?.toString() ?: "")
                 ObjVoid
             }
             addFn("run") {
-                requireOnlyArg<Obj>().callOn(this)
+                call(requireOnlyArg())
             }
             addFn("cached") {
                 val builder = requireOnlyArg<Obj>()
                 val capturedScope = this
                 var calculated = false
                 var cachedValue: Obj = ObjVoid
-                ObjNativeCallable {
+                net.sergeych.lyng.obj.ObjExternCallable.fromBridge {
                     if (!calculated) {
-                        cachedValue = builder.callOn(capturedScope)
+                        cachedValue = capturedScope.call(builder)
                         calculated = true
                     }
                     cachedValue
@@ -504,7 +504,7 @@ class Script(
             }
             addFn("lazy") {
                 val builder = requireOnlyArg<Obj>()
-                ObjLazyDelegate(builder, this)
+                ObjLazyDelegate(builder, requireScope())
             }
             addVoidFn("delay") {
                 val a = args.firstAndOnly()
@@ -512,7 +512,7 @@ class Script(
                     is ObjInt -> delay(a.value)
                     is ObjReal -> delay((a.value * 1000).roundToLong())
                     is ObjDuration -> delay(a.duration)
-                    else -> raiseIllegalArgument("Expected Int, Real or Duration, got ${a.inspect(this)}")
+                    else -> raiseIllegalArgument("Expected Int, Real or Duration, got ${inspect(a)}")
                 }
             }
 
@@ -551,8 +551,9 @@ class Script(
 
             addFn("launch") {
                 val callable = requireOnlyArg<Obj>()
+                val captured = this
                 ObjDeferred(globalDefer {
-                    callable.callOn(this@addFn)
+                    captured.call(callable)
                 })
             }
 
@@ -564,7 +565,7 @@ class Script(
             addFn("flow", callSignature = CallSignature(tailBlockReceiverType = "FlowBuilder")) {
                 // important is: current context contains closure often used in call;
                 // we'll need it for the producer
-                ObjFlow(requireOnlyArg<Obj>(), this)
+                ObjFlow(requireOnlyArg<Obj>(), requireScope())
             }
 
             val pi = ObjReal(PI)
@@ -639,7 +640,7 @@ class Script(
                             is ObjInt -> delay(a.value * 1000)
                             is ObjReal -> delay((a.value * 1000).roundToLong())
                             is ObjDuration -> delay(a.duration)
-                            else -> raiseIllegalArgument("Expected Duration, Int or Real, got ${a.inspect(this)}")
+                            else -> raiseIllegalArgument("Expected Duration, Int or Real, got ${inspect(a)}")
                         }
                     }
                 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/TryStatement.kt

@@ -36,7 +36,7 @@ class TryStatement(
     )
 
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "try statement")
+        return bytecodeOnly(scope, "try statement")
     }
 
     private fun resolveExceptionClass(scope: Scope, name: String): ObjClass {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/VarDeclStatement.kt

@@ -33,6 +33,6 @@ class VarDeclStatement(
     override val pos: Pos = startPos
 
     override suspend fun execute(context: Scope): Obj {
-        return interpreterDisabled(context, "var declaration")
+        return bytecodeOnly(context, "var declaration")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/WhenStatement.kt

@@ -19,8 +19,8 @@ package net.sergeych.lyng
 import net.sergeych.lyng.obj.Obj
 
 sealed class WhenCondition(open val expr: Statement, open val pos: Pos) {
-    protected fun interpreterDisabled(scope: Scope): Nothing {
+    protected fun bytecodeOnly(scope: Scope): Nothing {
-        return scope.raiseIllegalState("interpreter execution is not supported; when condition requires bytecode")
+        return scope.raiseIllegalState("bytecode-only execution is required; when condition needs compiled bytecode")
     }
 
     abstract suspend fun matches(scope: Scope, value: Obj): Boolean
@@ -31,7 +31,7 @@ class WhenEqualsCondition(
     override val pos: Pos,
 ) : WhenCondition(expr, pos) {
     override suspend fun matches(scope: Scope, value: Obj): Boolean {
-        return interpreterDisabled(scope)
+        return bytecodeOnly(scope)
     }
 }
 
@@ -41,7 +41,7 @@ class WhenInCondition(
     override val pos: Pos,
 ) : WhenCondition(expr, pos) {
     override suspend fun matches(scope: Scope, value: Obj): Boolean {
-        return interpreterDisabled(scope)
+        return bytecodeOnly(scope)
     }
 }
 
@@ -51,7 +51,7 @@ class WhenIsCondition(
     override val pos: Pos,
 ) : WhenCondition(expr, pos) {
     override suspend fun matches(scope: Scope, value: Obj): Boolean {
-        return interpreterDisabled(scope)
+        return bytecodeOnly(scope)
     }
 }
 
@@ -64,6 +64,6 @@ class WhenStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "when statement")
+        return bytecodeOnly(scope, "when statement")
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/CmdRuntime.kt

@@ -1880,13 +1880,23 @@ private suspend fun assignDestructurePattern(frame: CmdFrame, pattern: ListLiter
 
 private suspend fun assignDestructureTarget(frame: CmdFrame, ref: ObjRef, value: Obj, pos: Pos) {
     when (ref) {
-        is ListLiteralRef -> assignDestructurePattern(frame, ref, value, pos)
+        is ListLiteralRef -> {
+            assignDestructurePattern(frame, ref, value, pos)
+            return
+        }
         is LocalSlotRef -> {
             val index = resolveLocalSlotIndex(frame.fn, ref.name, preferCapture = ref.captureOwnerScopeId != null)
             if (index != null) {
                 frame.frame.setObj(index, value)
                 return
             }
+            val scopeSlot = frame.fn.scopeSlotNames.indexOfFirst { it == ref.name }
+            if (scopeSlot >= 0) {
+                val target = frame.scopeTarget(scopeSlot)
+                val slotIndex = frame.ensureScopeSlot(target, scopeSlot)
+                target.setSlotValue(slotIndex, value)
+                return
+            }
         }
         is LocalVarRef -> {
             val index = resolveLocalSlotIndex(frame.fn, ref.name, preferCapture = false)
@@ -1894,6 +1904,13 @@ private suspend fun assignDestructureTarget(frame: CmdFrame, ref: ObjRef, value:
                 frame.frame.setObj(index, value)
                 return
             }
+            val scopeSlot = frame.fn.scopeSlotNames.indexOfFirst { it == ref.name }
+            if (scopeSlot >= 0) {
+                val target = frame.scopeTarget(scopeSlot)
+                val slotIndex = frame.ensureScopeSlot(target, scopeSlot)
+                target.setSlotValue(slotIndex, value)
+                return
+            }
         }
         is FastLocalVarRef -> {
             val index = resolveLocalSlotIndex(frame.fn, ref.name, preferCapture = false)
@@ -1901,6 +1918,13 @@ private suspend fun assignDestructureTarget(frame: CmdFrame, ref: ObjRef, value:
                 frame.frame.setObj(index, value)
                 return
             }
+            val scopeSlot = frame.fn.scopeSlotNames.indexOfFirst { it == ref.name }
+            if (scopeSlot >= 0) {
+                val target = frame.scopeTarget(scopeSlot)
+                val slotIndex = frame.ensureScopeSlot(target, scopeSlot)
+                target.setSlotValue(slotIndex, value)
+                return
+            }
         }
         else -> {}
     }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/miniast/DocRegistrationHelpers.kt

@@ -19,6 +19,7 @@ package net.sergeych.lyng.miniast
 
 import net.sergeych.lyng.ModuleScope
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
 import net.sergeych.lyng.Visibility
 import net.sergeych.lyng.obj.Obj
 import net.sergeych.lyng.obj.ObjClass
@@ -40,7 +41,7 @@ inline fun <reified T : Obj> Scope.addFnDoc(
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
     callSignature: net.sergeych.lyng.CallSignature? = null,
-    crossinline fn: suspend Scope.() -> T
+    crossinline fn: suspend ScopeFacade.() -> T
 ) {
     // Register runtime function(s)
     addFn(*names, callSignature = callSignature) { fn() }
@@ -57,7 +58,7 @@ inline fun Scope.addVoidFnDoc(
     doc: String,
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
-    crossinline fn: suspend Scope.() -> Unit
+    crossinline fn: suspend ScopeFacade.() -> Unit
 ) {
     addFnDoc<ObjVoid>(
         *names,
@@ -98,7 +99,7 @@ fun ObjClass.addFnDoc(
     visibility: Visibility = Visibility.Public,
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
-    code: suspend Scope.() -> Obj
+    code: suspend ScopeFacade.() -> Obj
 ) {
     // Register runtime method
     addFn(name, isOpen, visibility, code = code)
@@ -136,7 +137,7 @@ fun ObjClass.addClassFnDoc(
     isOpen: Boolean = false,
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
-    code: suspend Scope.() -> Obj
+    code: suspend ScopeFacade.() -> Obj
 ) {
     addClassFn(name, isOpen, code)
     BuiltinDocRegistry.module(moduleName ?: ownerModuleNameFromClassOrUnknown()) {
@@ -152,8 +153,8 @@ fun ObjClass.addPropertyDoc(
     type: TypeDoc? = null,
     visibility: Visibility = Visibility.Public,
     moduleName: String? = null,
-    getter: (suspend Scope.() -> Obj)? = null,
+    getter: (suspend ScopeFacade.() -> Obj)? = null,
-    setter: (suspend Scope.(Obj) -> Unit)? = null
+    setter: (suspend ScopeFacade.(Obj) -> Unit)? = null
 ) {
     addProperty(name, getter, setter, visibility)
     BuiltinDocRegistry.module(moduleName ?: ownerModuleNameFromClassOrUnknown()) {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Accessor.kt

@@ -20,7 +20,6 @@ package net.sergeych.lyng.obj
 import net.sergeych.lyng.Compiler
 import net.sergeych.lyng.Pos
 import net.sergeych.lyng.Scope
-import net.sergeych.lyng.ScriptError
 
 // avoid KDOC bug: keep it
 @Suppress("unused")
@@ -37,10 +36,11 @@ private class LambdaRef(
     private val getterFn: suspend (Scope) -> ObjRecord,
     private val setterFn: (suspend (Pos, Scope, Obj) -> Unit)? = null
 ) : ObjRef {
-    override suspend fun get(scope: Scope): ObjRecord = getterFn(scope)
+    override suspend fun get(scope: Scope): ObjRecord {
+        return scope.raiseIllegalState("bytecode-only execution is required; Accessor evaluation is disabled")
+    }
     override suspend fun setAt(pos: Pos, scope: Scope, newValue: Obj) {
-        val s = setterFn ?: throw ScriptError(pos, "can't assign value")
+        scope.raiseIllegalState("bytecode-only execution is required; Accessor assignment is disabled")
-        s(pos, scope, newValue)
     }
 }
 
@@ -57,4 +57,4 @@ val Accessor.getter: suspend (Scope) -> ObjRecord
 
 fun Accessor.setter(pos: Pos): suspend (Scope, Obj) -> Unit = { scope, newValue ->
     this.setAt(pos, scope, newValue)
-}
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt

@@ -562,10 +562,10 @@ open class Obj {
                 else -> del.objClass.getInstanceMemberOrNull("getValue")
             }
             if (getValueRec == null || getValueRec.declaringClass?.className == "Delegate") {
-                val wrapper = ObjNativeCallable {
+                val wrapper = ObjExternCallable.fromBridge {
                     val th2 = if (thisObj === ObjVoid) ObjNull else thisObj
                     val allArgs = (listOf(th2, ObjString(name)) + args.list).toTypedArray()
-                    del.invokeInstanceMethod(this, "invoke", Arguments(*allArgs))
+                    del.invokeInstanceMethod(requireScope(), "invoke", Arguments(*allArgs))
                 }
                 return obj.copy(
                     value = wrapper,
@@ -740,7 +740,7 @@ open class Obj {
                 returns = type("lyng.String"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisObj.toString(this, true)
+                toStringOf(thisObj, true)
             }
             addFnDoc(
                 name = "inspect",
@@ -748,7 +748,7 @@ open class Obj {
                 returns = type("lyng.String"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisObj.inspect(this).toObj()
+                inspect(thisObj).toObj()
             }
             addFnDoc(
                 name = "contains",
@@ -757,7 +757,7 @@ open class Obj {
                 returns = type("lyng.Bool"),
                 moduleName = "lyng.stdlib"
             ) {
-                ObjBool(thisObj.contains(this, args.firstAndOnly()))
+                ObjBool(thisObj.contains(requireScope(), args.firstAndOnly()))
             }
             // utilities
             addFnDoc(
@@ -766,7 +766,7 @@ open class Obj {
                 params = listOf(ParamDoc("block")),
                 moduleName = "lyng.stdlib"
             ) {
-                args.firstAndOnly().callOn(createChildScope(Arguments(thisObj)))
+                call(args.firstAndOnly(), Arguments(thisObj))
             }
             addFnDoc(
                 name = "apply",
@@ -775,11 +775,12 @@ open class Obj {
                 moduleName = "lyng.stdlib"
             ) {
                 val body = args.firstAndOnly()
+                val scope = requireScope()
                 (thisObj as? ObjInstance)?.let {
-                    body.callOn(ApplyScope(this, it.instanceScope))
+                    body.callOn(ApplyScope(scope, it.instanceScope))
                 } ?: run {
-                    val appliedScope = createChildScope(newThisObj = thisObj)
+                    val appliedScope = scope.createChildScope(newThisObj = thisObj)
-                    body.callOn(ApplyScope(this, appliedScope))
+                    body.callOn(ApplyScope(scope, appliedScope))
                 }
                 thisObj
             }
@@ -789,7 +790,7 @@ open class Obj {
                 params = listOf(ParamDoc("block")),
                 moduleName = "lyng.stdlib"
             ) {
-                args.firstAndOnly().callOn(createChildScope(Arguments(thisObj)))
+                call(args.firstAndOnly(), Arguments(thisObj))
                 thisObj
             }
             addFnDoc(
@@ -798,16 +799,16 @@ open class Obj {
                 params = listOf(ParamDoc("block")),
                 moduleName = "lyng.stdlib"
             ) {
-                args.firstAndOnly().callOn(this)
+                call(args.firstAndOnly())
             }
             addFn("getAt") {
                 requireExactCount(1)
-                thisObj.getAt(this, requiredArg<Obj>(0))
+                thisObj.getAt(requireScope(), requiredArg<Obj>(0))
             }
             addFn("putAt") {
                 requireExactCount(2)
                 val newValue = args[1]
-                thisObj.putAt(this, requiredArg<Obj>(0), newValue)
+                thisObj.putAt(requireScope(), requiredArg<Obj>(0), newValue)
                 newValue
             }
             addFnDoc(
@@ -816,7 +817,7 @@ open class Obj {
                 returns = type("lyng.String"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisObj.toJson(this).toString().toObj()
+                thisObj.toJson(requireScope()).toString().toObj()
             }
             addFnDoc(
                 name = "toJsonString",
@@ -824,7 +825,7 @@ open class Obj {
                 returns = type("lyng.String"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisObj.toJson(this).toString().toObj()
+                thisObj.toJson(requireScope()).toString().toObj()
             }
             addFnDoc(
                 name = "clamp",
@@ -836,12 +837,12 @@ open class Obj {
 
                 var result = thisObj
                 if (range.start != null && !range.start.isNull) {
-                    if (result.compareTo(this, range.start) < 0) {
+                    if (result.compareTo(requireScope(), range.start) < 0) {
                         result = range.start
                     }
                 }
                 if (range.end != null && !range.end.isNull) {
-                    val cmp = range.end.compareTo(this, result)
+                    val cmp = range.end.compareTo(requireScope(), result)
                     if (range.isEndInclusive) {
                         if (cmp < 0) result = range.end
                     } else {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjArray.kt

@@ -32,7 +32,7 @@ val ObjArray by lazy {
             doc = "Iterator over elements of this array using its indexer.",
             returns = TypeGenericDoc(type("lyng.Iterator"), listOf(type("lyng.Any"))),
             moduleName = "lyng.stdlib"
-        ) { ObjArrayIterator(thisObj).also { it.init(this) } }
+        ) { ObjArrayIterator(thisObj).also { it.init(requireScope()) } }
 
         addFnDoc(
             name = "contains",
@@ -42,9 +42,10 @@ val ObjArray by lazy {
             isOpen = true,
             moduleName = "lyng.stdlib"
         ) {
+            val scope = requireScope()
             val obj = args.firstAndOnly()
-            for (i in 0..<thisObj.invokeInstanceMethod(this, "size").toInt()) {
+            for (i in 0..<thisObj.invokeInstanceMethod(scope, "size").toInt()) {
-                if (thisObj.getAt(this, ObjInt(i.toLong())).compareTo(this, obj) == 0) return@addFnDoc ObjTrue
+                if (thisObj.getAt(scope, ObjInt(i.toLong())).compareTo(scope, obj) == 0) return@addFnDoc ObjTrue
             }
             ObjFalse
         }
@@ -55,10 +56,11 @@ val ObjArray by lazy {
             type = type("lyng.Any"),
             moduleName = "lyng.stdlib",
             getter = {
+                val scope = requireScope()
                 this.thisObj.invokeInstanceMethod(
-                    this,
+                    scope,
                     "getAt",
-                    (this.thisObj.invokeInstanceMethod(this, "size").toInt() - 1).toObj()
+                    (this.thisObj.invokeInstanceMethod(scope, "size").toInt() - 1).toObj()
                 )
             }
         )
@@ -68,7 +70,10 @@ val ObjArray by lazy {
             doc = "Index of the last element (size - 1).",
             type = type("lyng.Int"),
             moduleName = "lyng.stdlib",
-            getter = { (this.thisObj.invokeInstanceMethod(this, "size").toInt() - 1).toObj() }
+            getter = {
+                val scope = requireScope()
+                (this.thisObj.invokeInstanceMethod(scope, "size").toInt() - 1).toObj()
+            }
         )
 
         addPropertyDoc(
@@ -76,7 +81,10 @@ val ObjArray by lazy {
             doc = "Range of valid indices for this array.",
             type = type("lyng.Range"),
             moduleName = "lyng.stdlib",
-            getter = { ObjRange(0.toObj(), this.thisObj.invokeInstanceMethod(this, "size"), false) }
+            getter = {
+                val scope = requireScope()
+                ObjRange(0.toObj(), this.thisObj.invokeInstanceMethod(scope, "size"), false)
+            }
         )
 
         addFnDoc(
@@ -86,15 +94,16 @@ val ObjArray by lazy {
             returns = type("lyng.Int"),
             moduleName = "lyng.stdlib"
         ) {
+            val scope = requireScope()
             val target = args.firstAndOnly()
             var low = 0
-            var high = thisObj.invokeInstanceMethod(this, "size").toInt() - 1
+            var high = thisObj.invokeInstanceMethod(scope, "size").toInt() - 1
 
             while (low <= high) {
                 val mid = (low + high) / 2
-                val midVal = thisObj.getAt(this, ObjInt(mid.toLong()))
+                val midVal = thisObj.getAt(scope, ObjInt(mid.toLong()))
 
-                val cmp = midVal.compareTo(this, target)
+                val cmp = midVal.compareTo(scope, target)
                 when {
                     cmp == 0 -> return@addFnDoc (mid).toObj()
                     cmp > 0 -> high = mid - 1
@@ -105,4 +114,4 @@ val ObjArray by lazy {
             (-low - 1).toObj()
         }
     }
-}
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjArrayIterator.kt

@@ -38,8 +38,8 @@ class ObjArrayIterator(val array: Obj) : Obj() {
                 addFn("next") {
                     val self = thisAs<ObjArrayIterator>()
                     if (self.nextIndex < self.lastIndex) {
-                        self.array.invokeInstanceMethod(this, "getAt", (self.nextIndex++).toObj())
+                        self.array.invokeInstanceMethod(requireScope(), "getAt", (self.nextIndex++).toObj())
-                    } else raiseError(ObjIterationFinishedException(this))
+                    } else raiseError(ObjIterationFinishedException(requireScope()))
                 }
                 addFn("hasNext") {
                     val self = thisAs<ObjArrayIterator>()
@@ -48,4 +48,4 @@ class ObjArrayIterator(val array: Obj) : Obj() {
             }
         }
     }
-}
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjClass.kt

@@ -930,9 +930,9 @@ open class ObjClass(
         isOverride: Boolean = false,
         pos: Pos = Pos.builtIn,
         methodId: Int? = null,
-        code: (suspend Scope.() -> Obj)? = null
+        code: (suspend net.sergeych.lyng.ScopeFacade.() -> Obj)? = null
     ) {
-        val stmt = code?.let { ObjNativeCallable { it() } } ?: ObjNull
+        val stmt = code?.let { ObjExternCallable.fromBridge { it() } } ?: ObjNull
         createField(
             name, stmt, isMutable, visibility, writeVisibility, pos, declaringClass,
             isAbstract = isAbstract, isClosed = isClosed, isOverride = isOverride,
@@ -945,8 +945,8 @@ open class ObjClass(
 
     fun addProperty(
         name: String,
-        getter: (suspend Scope.() -> Obj)? = null,
+        getter: (suspend net.sergeych.lyng.ScopeFacade.() -> Obj)? = null,
-        setter: (suspend Scope.(Obj) -> Unit)? = null,
+        setter: (suspend net.sergeych.lyng.ScopeFacade.(Obj) -> Unit)? = null,
         visibility: Visibility = Visibility.Public,
         writeVisibility: Visibility? = null,
         declaringClass: ObjClass? = this,
@@ -957,8 +957,8 @@ open class ObjClass(
         prop: ObjProperty? = null,
         methodId: Int? = null
     ) {
-        val g = getter?.let { ObjNativeCallable { it() } }
+        val g = getter?.let { ObjExternCallable.fromBridge { it() } }
-        val s = setter?.let { ObjNativeCallable { it(requiredArg(0)); ObjVoid } }
+        val s = setter?.let { ObjExternCallable.fromBridge { it(requiredArg(0)); ObjVoid } }
         val finalProp = prop ?: if (isAbstract) ObjNull else ObjProperty(name, g, s)
         createField(
             name, finalProp, false, visibility, writeVisibility, pos, declaringClass,
@@ -969,8 +969,8 @@ open class ObjClass(
     }
 
     fun addClassConst(name: String, value: Obj) = createClassField(name, value)
-    fun addClassFn(name: String, isOpen: Boolean = false, code: suspend Scope.() -> Obj) {
+    fun addClassFn(name: String, isOpen: Boolean = false, code: suspend net.sergeych.lyng.ScopeFacade.() -> Obj) {
-        createClassField(name, ObjNativeCallable { code() }, isOpen, type = ObjRecord.Type.Fun)
+        createClassField(name, ObjExternCallable.fromBridge { code() }, isOpen, type = ObjRecord.Type.Fun)
     }
 
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjDateTime.kt

@@ -53,9 +53,8 @@ class ObjDateTime(val instant: Instant, val timeZone: TimeZone) : Obj() {
                 if (rec.type == ObjRecord.Type.Fun) {
                     val target = rec.value
                     return ObjRecord(
-                        ObjNativeCallable {
+                        ObjExternCallable.fromBridge {
-                            val callScope = createChildScope(args = args, newThisObj = this@ObjDateTime)
+                            call(target, args, newThisObj = this@ObjDateTime)
-                            target.callOn(callScope)
                         },
                         rec.isMutable
                     )

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjException.kt

@@ -139,7 +139,7 @@ open class ObjException(
         class ExceptionClass(val name: String, vararg parents: ObjClass) : ObjClass(name, *parents) {
             init {
                 constructorMeta = ArgsDeclaration(
-                    listOf(ArgsDeclaration.Item("message", defaultValue = ObjNativeCallable { ObjString(name) })),
+                    listOf(ArgsDeclaration.Item("message", defaultValue = ObjExternCallable.fromBridge { ObjString(name) })),
                     Token.Type.RPAREN
                 )
             }
@@ -177,17 +177,17 @@ open class ObjException(
         }
 
         val Root = ExceptionClass("Exception").apply {
-            instanceInitializers.add(ObjNativeCallable {
+            instanceInitializers.add(ObjExternCallable.fromBridge {
                 if (thisObj is ObjInstance) {
                     val msg = get("message")?.value ?: ObjString("Exception")
                     (thisObj as ObjInstance).instanceScope.addItem("Exception::message", false, msg)
 
-                    val stack = captureStackTrace(this)
+                    val stack = captureStackTrace(requireScope())
                     (thisObj as ObjInstance).instanceScope.addItem("Exception::stackTrace", false, stack)
                 }
                 ObjVoid
             })
-            instanceConstructor = ObjNativeCallable { ObjVoid }
+            instanceConstructor = ObjExternCallable.fromBridge { ObjVoid }
             addPropertyDoc(
                 name = "message",
                 doc = "Human‑readable error message.",
@@ -244,7 +244,7 @@ open class ObjException(
                     is ObjInstance -> t.instanceScope.get("Exception::stackTrace")?.value as? ObjList ?: ObjList()
                     else -> ObjList()
                 }
-                val at = stack.list.firstOrNull()?.toString(this) ?: ObjString("(unknown)")
+                val at = stack.list.firstOrNull()?.let { toStringOf(it) } ?: ObjString("(unknown)")
                 ObjString("${thisObj.objClass.className}: $msg at $at")
             }
         }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjFlow.kt

@@ -106,8 +106,8 @@ class ObjFlow(val producer: Obj, val scope: Scope) : Obj() {
                 moduleName = "lyng.stdlib"
             ) {
                 val objFlow = thisAs<ObjFlow>()
-                ObjFlowIterator(ObjNativeCallable {
+                ObjFlowIterator(ObjExternCallable.fromBridge {
-                    objFlow.producer.callOn(this)
+                    call(objFlow.producer)
                 })
             }
         }
@@ -164,7 +164,7 @@ class ObjFlowIterator(val producer: Obj) : Obj() {
                 doc = "Whether another element is available from the flow.",
                 returns = type("lyng.Bool"),
                 moduleName = "lyng.stdlib"
-            ) { thisAs<ObjFlowIterator>().hasNext(this).toObj() }
+            ) { thisAs<ObjFlowIterator>().hasNext(requireScope()).toObj() }
             addFnDoc(
                 name = "next",
                 doc = "Receive the next element from the flow or throw if completed.",
@@ -172,7 +172,7 @@ class ObjFlowIterator(val producer: Obj) : Obj() {
                 moduleName = "lyng.stdlib"
             ) {
                 val x = thisAs<ObjFlowIterator>()
-                x.next(this)
+                x.next(requireScope())
             }
             addFnDoc(
                 name = "cancelIteration",

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjInstance.kt

@@ -177,10 +177,10 @@ class ObjInstance(override val objClass: ObjClass) : Obj() {
                 else -> del.objClass.getInstanceMemberOrNull("getValue")
             }
             if (getValueRec == null || getValueRec.declaringClass?.className == "Delegate") {
-                val wrapper = ObjNativeCallable {
+                val wrapper = ObjExternCallable.fromBridge {
                     val th2 = if (thisObj === ObjVoid) ObjNull else thisObj
                     val allArgs = (listOf(th2, ObjString(name)) + args.list).toTypedArray()
-                    del.invokeInstanceMethod(this, "invoke", Arguments(*allArgs))
+                    del.invokeInstanceMethod(requireScope(), "invoke", Arguments(*allArgs))
                 }
                 return obj.copy(value = wrapper, type = ObjRecord.Type.Other)
             }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjIterable.kt

@@ -41,10 +41,11 @@ val ObjIterable by lazy {
             returns = type("lyng.List"),
             moduleName = "lyng.stdlib"
         ) {
+            val scope = requireScope()
             val result = mutableListOf<Obj>()
-            val it = thisObj.invokeInstanceMethod(this, "iterator")
+            val it = thisObj.invokeInstanceMethod(scope, "iterator")
-            while (it.invokeInstanceMethod(this, "hasNext").toBool()) {
+            while (it.invokeInstanceMethod(scope, "hasNext").toBool()) {
-                result.add(it.invokeInstanceMethod(this, "next"))
+                result.add(it.invokeInstanceMethod(scope, "next"))
             }
             ObjList(result)
         }
@@ -58,10 +59,11 @@ val ObjIterable by lazy {
             isOpen = true,
             moduleName = "lyng.stdlib"
         ) {
+            val scope = requireScope()
             val obj = args.firstAndOnly()
-            val it = thisObj.invokeInstanceMethod(this, "iterator")
+            val it = thisObj.invokeInstanceMethod(scope, "iterator")
-            while (it.invokeInstanceMethod(this, "hasNext").toBool()) {
+            while (it.invokeInstanceMethod(scope, "hasNext").toBool()) {
-                if (obj.equals(this, it.invokeInstanceMethod(this, "next")))
+                if (obj.equals(scope, it.invokeInstanceMethod(scope, "next")))
                     return@addFnDoc ObjTrue
             }
             ObjFalse
@@ -75,11 +77,12 @@ val ObjIterable by lazy {
             isOpen = true,
             moduleName = "lyng.stdlib"
         ) {
+            val scope = requireScope()
             val obj = args.firstAndOnly()
             var index = 0
-            val it = thisObj.invokeInstanceMethod(this, "iterator")
+            val it = thisObj.invokeInstanceMethod(scope, "iterator")
-            while (it.invokeInstanceMethod(this, "hasNext").toBool()) {
+            while (it.invokeInstanceMethod(scope, "hasNext").toBool()) {
-                if (obj.equals(this, it.invokeInstanceMethod(this, "next")))
+                if (obj.equals(scope, it.invokeInstanceMethod(scope, "next")))
                     return@addFnDoc ObjInt(index.toLong())
                 index++
             }
@@ -96,9 +99,10 @@ val ObjIterable by lazy {
                     this.thisObj
                 else {
                     val result = mutableSetOf<Obj>()
-                    val it = this.thisObj.invokeInstanceMethod(this, "iterator")
+                    val scope = requireScope()
-                    while (it.invokeInstanceMethod(this, "hasNext").toBool()) {
+                    val it = this.thisObj.invokeInstanceMethod(scope, "iterator")
-                        result.add(it.invokeInstanceMethod(this, "next"))
+                    while (it.invokeInstanceMethod(scope, "hasNext").toBool()) {
+                        result.add(it.invokeInstanceMethod(scope, "next"))
                     }
                     ObjSet(result)
                 }
@@ -112,10 +116,11 @@ val ObjIterable by lazy {
             moduleName = "lyng.stdlib",
             getter = {
                 val result = mutableMapOf<Obj, Obj>()
-                this.thisObj.enumerate(this) { pair ->
+                val scope = requireScope()
+                this.thisObj.enumerate(scope) { pair ->
                     when (pair) {
                         is ObjMapEntry -> result[pair.key] = pair.value
-                        else -> result[pair.getAt(this, 0)] = pair.getAt(this, 1)
+                        else -> result[pair.getAt(scope, 0)] = pair.getAt(scope, 1)
                     }
                     true
                 }
@@ -132,9 +137,8 @@ val ObjIterable by lazy {
         ) {
             val association = requireOnlyArg<Obj>()
             val result = ObjMap()
-            thisObj.toFlow(this).collect {
+            thisObj.toFlow(requireScope()).collect {
-                val callScope = createChildScope(args = Arguments(it))
+                result.map[call(association, Arguments(it))] = it
-                result.map[association.callOn(callScope)] = it
             }
             result
         }
@@ -146,11 +150,12 @@ val ObjIterable by lazy {
             isOpen = true,
             moduleName = "lyng.stdlib"
         ) {
-            val it = thisObj.invokeInstanceMethod(this, "iterator")
+            val scope = requireScope()
+            val it = thisObj.invokeInstanceMethod(scope, "iterator")
             val fn = requiredArg<Obj>(0)
-            while (it.invokeInstanceMethod(this, "hasNext").toBool()) {
+            while (it.invokeInstanceMethod(scope, "hasNext").toBool()) {
-                val x = it.invokeInstanceMethod(this, "next")
+                val x = it.invokeInstanceMethod(scope, "next")
-                fn.callOn(this.createChildScope(Arguments(listOf(x))))
+                call(fn, Arguments(listOf(x)))
             }
             ObjVoid
         }
@@ -165,9 +170,8 @@ val ObjIterable by lazy {
         ) {
             val fn = requiredArg<Obj>(0)
             val result = mutableListOf<Obj>()
-            thisObj.toFlow(this).collect {
+            thisObj.toFlow(requireScope()).collect {
-                val callScope = createChildScope(args = Arguments(it))
+                result.add(call(fn, Arguments(it)))
-                result.add(fn.callOn(callScope))
             }
             ObjList(result)
         }
@@ -182,9 +186,8 @@ val ObjIterable by lazy {
         ) {
             val fn = requiredArg<Obj>(0)
             val result = mutableListOf<Obj>()
-            thisObj.toFlow(this).collect {
+            thisObj.toFlow(requireScope()).collect {
-                val callScope = createChildScope(args = Arguments(it))
+                val transformed = call(fn, Arguments(it))
-                val transformed = fn.callOn(callScope)
                 if( transformed != ObjNull) result.add(transformed)
             }
             ObjList(result)
@@ -200,7 +203,7 @@ val ObjIterable by lazy {
             var n = requireOnlyArg<ObjInt>().value.toInt()
             val result = mutableListOf<Obj>()
             if (n > 0) {
-                thisObj.enumerate(this) {
+                thisObj.enumerate(requireScope()) {
                     result.add(it)
                     --n > 0
                 }
@@ -215,8 +218,8 @@ val ObjIterable by lazy {
             moduleName = "lyng.stdlib",
             getter = {
                 ObjBool(
-                    this.thisObj.invokeInstanceMethod(this, "iterator")
+                    this.thisObj.invokeInstanceMethod(requireScope(), "iterator")
-                        .invokeInstanceMethod(this, "hasNext").toBool()
+                        .invokeInstanceMethod(requireScope(), "hasNext").toBool()
                         .not()
                 )
             }
@@ -229,11 +232,10 @@ val ObjIterable by lazy {
             returns = type("lyng.List"),
             moduleName = "lyng.stdlib"
         ) {
-            val list = thisObj.callMethod<ObjList>(this, "toList")
+            val list = thisObj.callMethod<ObjList>(requireScope(), "toList")
             val comparator = requireOnlyArg<Obj>()
             list.quicksort { a, b ->
-                val callScope = createChildScope(args = Arguments(a, b))
+                call(comparator, Arguments(a, b)).toInt()
-                comparator.callOn(callScope).toInt()
             }
             list
         }
@@ -244,7 +246,7 @@ val ObjIterable by lazy {
             returns = type("lyng.List"),
             moduleName = "lyng.stdlib"
         ) {
-            val list = thisObj.callMethod<ObjList>(this, "toList")
+            val list = thisObj.callMethod<ObjList>(requireScope(), "toList")
             list.list.reverse()
             list
         }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjIterator.kt

@@ -69,13 +69,12 @@ val ObjIterator by lazy {
         ) {
             val out = mutableListOf<Obj>()
             while (true) {
-                val has = thisObj.invokeInstanceMethod(this, "hasNext").toBool()
+                val has = thisObj.invokeInstanceMethod(requireScope(), "hasNext").toBool()
                 if (!has) break
-                val v = thisObj.invokeInstanceMethod(this, "next")
+                val v = thisObj.invokeInstanceMethod(requireScope(), "next")
                 out += v
             }
             ObjList(out.toMutableList())
         }
     }
 }
-

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjList.kt

@@ -373,8 +373,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
             ) {
                 val comparator = requireOnlyArg<Obj>()
                 thisAs<ObjList>().quicksort { a, b ->
-                    val callScope = createChildScope(args = Arguments(a, b))
+                    call(comparator, Arguments(a, b)).toInt()
-                    comparator.callOn(callScope).toInt()
                 }
                 ObjVoid
             }
@@ -394,6 +393,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                 val self = thisAs<ObjList>()
                 val l = self.list
                 if (l.isEmpty()) return@addFnDoc ObjNull
+                val scope = requireScope()
                 if (net.sergeych.lyng.PerfFlags.PRIMITIVE_FASTOPS) {
                     // Fast path: all ints → accumulate as long
                     var i = 0
@@ -407,7 +407,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                             // Fallback to generic dynamic '+' accumulation starting from current acc
                             var res: Obj = ObjInt(acc)
                             while (i < l.size) {
-                                res = res.plus(this, l[i])
+                                res = res.plus(scope, l[i])
                                 i++
                             }
                             return@addFnDoc res
@@ -419,7 +419,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                 var res: Obj = l[0]
                 var k = 1
                 while (k < l.size) {
-                    res = res.plus(this, l[k])
+                    res = res.plus(scope, l[k])
                     k++
                 }
                 res
@@ -431,6 +431,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
             ) {
                 val l = thisAs<ObjList>().list
                 if (l.isEmpty()) return@addFnDoc ObjNull
+                val scope = requireScope()
                 if (net.sergeych.lyng.PerfFlags.PRIMITIVE_FASTOPS) {
                     var i = 0
                     var hasOnlyInts = true
@@ -451,7 +452,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                 var i = 1
                 while (i < l.size) {
                     val v = l[i]
-                    if (v.compareTo(this, res) < 0) res = v
+                    if (v.compareTo(scope, res) < 0) res = v
                     i++
                 }
                 res
@@ -463,6 +464,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
             ) {
                 val l = thisAs<ObjList>().list
                 if (l.isEmpty()) return@addFnDoc ObjNull
+                val scope = requireScope()
                 if (net.sergeych.lyng.PerfFlags.PRIMITIVE_FASTOPS) {
                     var i = 0
                     var hasOnlyInts = true
@@ -483,7 +485,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                 var i = 1
                 while (i < l.size) {
                     val v = l[i]
-                    if (v.compareTo(this, res) > 0) res = v
+                    if (v.compareTo(scope, res) > 0) res = v
                     i++
                 }
                 res
@@ -497,6 +499,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
             ) {
                 val l = thisAs<ObjList>().list
                 val needle = args.firstAndOnly()
+                val scope = requireScope()
                 if (net.sergeych.lyng.PerfFlags.PRIMITIVE_FASTOPS && needle is ObjInt) {
                     var i = 0
                     while (i < l.size) {
@@ -508,7 +511,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
                 }
                 var i = 0
                 while (i < l.size) {
-                    if (l[i].compareTo(this, needle) == 0) return@addFnDoc ObjInt(i.toLong())
+                    if (l[i].compareTo(scope, needle) == 0) return@addFnDoc ObjInt(i.toLong())
                     i++
                 }
                 ObjInt((-1).toLong())

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjMap.kt

@@ -261,7 +261,7 @@ class ObjMap(val map: MutableMap<Obj, Obj> = mutableMapOf()) : Obj() {
                 val key = requiredArg<Obj>(0)
                 thisAs<ObjMap>().map.getOrPut(key) {
                     val lambda = requiredArg<Obj>(1)
-                    lambda.callOn(this)
+                    call(lambda)
                 }
             }
             addPropertyDoc(

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjMutex.kt

@@ -44,7 +44,7 @@ class ObjMutex(val mutex: Mutex): Obj() {
                 // Execute user lambda directly in the current scope to preserve the active scope
                 // ancestry across suspension points. The lambda still constructs a closure scope
                 // on top of this frame, and parseLambdaExpression sets skipScopeCreation for its body.
-                thisAs<ObjMutex>().mutex.withLock { f.callOn(this) }
+                thisAs<ObjMutex>().mutex.withLock { call(f) }
             }
         }
     }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjNativeCallable.kt

@@ -1,33 +0,0 @@
-/*
- * Copyright 2026 Sergey S. Chernov
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-package net.sergeych.lyng.obj
-
-import net.sergeych.lyng.Scope
-import net.sergeych.lyng.Statement
-
-class ObjNativeCallable(
-    private val fn: suspend Scope.() -> Obj
-) : Obj() {
-
-    override val objClass: ObjClass
-        get() = Statement.type
-
-    override suspend fun callOn(scope: Scope): Obj = scope.fn()
-
-    override fun toString(): String = "NativeCallable@${hashCode()}"
-}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjRange.kt

@@ -270,7 +270,7 @@ class ObjRange(
                 moduleName = "lyng.stdlib"
             ) {
                 val self = thisAs<ObjRange>()
-                self.buildIterator(this)
+                self.buildIterator(requireScope())
             }
         }
     }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjRangeIterator.kt

@@ -65,10 +65,10 @@ class ObjRangeIterator(
     companion object {
         val type = ObjClass("RangeIterator", ObjIterator).apply {
             addFn("hasNext") {
-                thisAs<ObjRangeIterator>().hasNext(this).toObj()
+                thisAs<ObjRangeIterator>().hasNext(requireScope()).toObj()
             }
             addFn("next") {
-                thisAs<ObjRangeIterator>().next(this)
+                thisAs<ObjRangeIterator>().next(requireScope())
             }
         }
     }
@@ -98,7 +98,7 @@ class ObjFastIntRangeIterator(private val start: Int, private val endExclusive:
     companion object {
         val type = ObjClass("FastIntRangeIterator", ObjIterator).apply {
             addFn("hasNext") { thisAs<ObjFastIntRangeIterator>().hasNext().toObj() }
-            addFn("next") { thisAs<ObjFastIntRangeIterator>().next(this) }
+            addFn("next") { thisAs<ObjFastIntRangeIterator>().next(requireScope()) }
         }
     }
 }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjReal.kt

@@ -125,7 +125,7 @@ data class ObjReal(val value: Double) : Obj(), Numeric {
             // roundToInt: number rounded to the nearest integer
             addConstDoc(
                 name = "roundToInt",
-                value = ObjNativeCallable {
+                value = ObjExternCallable.fromBridge {
                     (thisObj as ObjReal).value.roundToLong().toObj()
                 },
                 doc = "This real number rounded to the nearest integer.",

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjRegex.kt

@@ -21,6 +21,7 @@ import net.sergeych.lyng.PerfFlags
 import net.sergeych.lyng.Pos
 import net.sergeych.lyng.RegexCache
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.miniast.*
 
 class ObjRegex(val regex: Regex) : Obj() {
@@ -75,9 +76,10 @@ class ObjRegex(val regex: Regex) : Obj() {
                 }
                 createField(
                     name = "operatorMatch",
-                    initialValue = ObjNativeCallable {
+                    initialValue = ObjExternCallable.fromBridge {
                         val other = args.firstAndOnly(Pos.builtIn)
-                        val targetScope = parent ?: this
+                        val scope = requireScope()
+                        val targetScope = scope.parent ?: scope
                         (thisObj as ObjRegex).operatorMatch(targetScope, other)
                     },
                     type = ObjRecord.Type.Fun

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjSet.kt

@@ -175,7 +175,7 @@ class ObjSet(val set: MutableSet<Obj> = mutableSetOf()) : Obj() {
                 returns = type("lyng.Set"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisAs<ObjSet>().mul(this, args.firstAndOnly())
+                thisAs<ObjSet>().mul(requireScope(), args.firstAndOnly())
             }
             addFnDoc(
                 name = "iterator",
@@ -192,7 +192,7 @@ class ObjSet(val set: MutableSet<Obj> = mutableSetOf()) : Obj() {
                 returns = type("lyng.Set"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisAs<ObjSet>().plus(this, args.firstAndOnly())
+                thisAs<ObjSet>().plus(requireScope(), args.firstAndOnly())
             }
             addFnDoc(
                 name = "subtract",
@@ -201,7 +201,7 @@ class ObjSet(val set: MutableSet<Obj> = mutableSetOf()) : Obj() {
                 returns = type("lyng.Set"),
                 moduleName = "lyng.stdlib"
             ) {
-                thisAs<ObjSet>().minus(this, args.firstAndOnly())
+                thisAs<ObjSet>().minus(requireScope(), args.firstAndOnly())
             }
             addFnDoc(
                 name = "remove",
@@ -216,4 +216,4 @@ class ObjSet(val set: MutableSet<Obj> = mutableSetOf()) : Obj() {
             }
         }
     }
-}
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjString.kt

@@ -25,6 +25,7 @@ import net.sergeych.lyng.PerfFlags
 import net.sergeych.lyng.Pos
 import net.sergeych.lyng.RegexCache
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.miniast.*
 import net.sergeych.lynon.LynonDecoder
 import net.sergeych.lynon.LynonEncoder
@@ -343,7 +344,7 @@ data class ObjString(val value: String) : Obj() {
                 name = "re",
                 initialValue = ObjProperty(
                     name = "re",
-                    getter = ObjNativeCallable {
+                    getter = ObjExternCallable.fromBridge {
                         val pattern = (thisObj as ObjString).value
                         val re = if (PerfFlags.REGEX_CACHE) RegexCache.get(pattern) else pattern.toRegex()
                         ObjRegex(re)
@@ -354,9 +355,10 @@ data class ObjString(val value: String) : Obj() {
             )
             createField(
                 name = "operatorMatch",
-                initialValue = ObjNativeCallable {
+                initialValue = ObjExternCallable.fromBridge {
                     val other = args.firstAndOnly(Pos.builtIn)
-                    val targetScope = parent ?: this
+                    val scope = requireScope()
+                    val targetScope = scope.parent ?: scope
                     (thisObj as ObjString).operatorMatch(targetScope, other)
                 },
                 type = ObjRecord.Type.Fun

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ScopeFacadeObjExtensions.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2026 Sergey S. Chernov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.sergeych.lyng.obj
+
+import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
+import net.sergeych.lyng.requireExactCount as coreRequireExactCount
+import net.sergeych.lyng.requireNoArgs as coreRequireNoArgs
+import net.sergeych.lyng.requireOnlyArg as coreRequireOnlyArg
+import net.sergeych.lyng.requiredArg as coreRequiredArg
+import net.sergeych.lyng.requireScope as coreRequireScope
+import net.sergeych.lyng.thisAs as coreThisAs
+
+inline fun <reified T : Obj> ScopeFacade.requiredArg(index: Int): T = coreRequiredArg(index)
+
+inline fun <reified T : Obj> ScopeFacade.requireOnlyArg(): T = coreRequireOnlyArg()
+
+fun ScopeFacade.requireExactCount(count: Int) = coreRequireExactCount(count)
+
+fun ScopeFacade.requireNoArgs() = coreRequireNoArgs()
+
+inline fun <reified T : Obj> ScopeFacade.thisAs(): T = coreThisAs()
+
+internal fun ScopeFacade.requireScope(): Scope = coreRequireScope()

lynglib/src/commonMain/kotlin/net/sergeych/lyng/statements.kt

@@ -60,8 +60,8 @@ abstract class Statement(
 
     suspend fun call(scope: Scope, vararg args: Obj) = execute(scope.createChildScope(args =  Arguments(*args)))
 
-    protected fun interpreterDisabled(scope: Scope, label: String): Nothing {
+    protected fun bytecodeOnly(scope: Scope, label: String): Nothing {
-        return scope.raiseIllegalState("interpreter execution is not supported; $label requires bytecode")
+        return scope.raiseIllegalState("bytecode-only execution is required; $label needs compiled bytecode")
     }
 
 }
@@ -73,7 +73,7 @@ class IfStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "if statement")
+        return bytecodeOnly(scope, "if statement")
     }
 }
 
@@ -92,7 +92,7 @@ class ForInStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "for-in statement")
+        return bytecodeOnly(scope, "for-in statement")
     }
 }
 
@@ -106,7 +106,7 @@ class WhileStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "while statement")
+        return bytecodeOnly(scope, "while statement")
     }
 }
 
@@ -119,7 +119,7 @@ class DoWhileStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "do-while statement")
+        return bytecodeOnly(scope, "do-while statement")
     }
 }
 
@@ -129,7 +129,7 @@ class BreakStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "break statement")
+        return bytecodeOnly(scope, "break statement")
     }
 }
 
@@ -138,7 +138,7 @@ class ContinueStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "continue statement")
+        return bytecodeOnly(scope, "continue statement")
     }
 }
 
@@ -148,7 +148,7 @@ class ReturnStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "return statement")
+        return bytecodeOnly(scope, "return statement")
     }
 }
 
@@ -157,7 +157,7 @@ class ThrowStatement(
     override val pos: Pos,
 ) : Statement() {
     override suspend fun execute(scope: Scope): Obj {
-        return interpreterDisabled(scope, "throw statement")
+        return bytecodeOnly(scope, "throw statement")
     }
 }
 
@@ -165,7 +165,7 @@ class ExpressionStatement(
     val ref: net.sergeych.lyng.obj.ObjRef,
     override val pos: Pos
 ) : Statement() {
-    override suspend fun execute(scope: Scope): Obj = interpreterDisabled(scope, "expression statement")
+    override suspend fun execute(scope: Scope): Obj = bytecodeOnly(scope, "expression statement")
 }
 
 fun Statement.raise(text: String): Nothing {
@@ -180,5 +180,5 @@ fun Statement.require(cond: Boolean, message: () -> String) {
 object NopStatement: Statement(true, true, ObjType.Void) {
     override val pos: Pos = Pos.builtIn
 
-    override suspend fun execute(scope: Scope): Obj = interpreterDisabled(scope, "nop statement")
+    override suspend fun execute(scope: Scope): Obj = bytecodeOnly(scope, "nop statement")
 }

lynglib/src/commonMain/kotlin/net/sergeych/lynon/packer.kt

@@ -18,6 +18,8 @@
 package net.sergeych.lynon
 
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.requireOnlyArg
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.obj.*
 
 // Most often used types:
@@ -42,10 +44,10 @@ object ObjLynonClass : ObjClass("Lynon") {
     init {
         addClassConst("test", ObjString("test_const"))
         addClassFn("encode") {
-            encodeAny(this, requireOnlyArg<Obj>())
+            encodeAny(requireScope(), requireOnlyArg<Obj>())
         }
         addClassFn("decode") {
-            decodeAny(this, requireOnlyArg<Obj>())
+            decodeAny(requireScope(), requireOnlyArg<Obj>())
         }
     }
 }

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -30,6 +30,7 @@ import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.encodeToJsonElement
 import net.sergeych.lyng.*
 import net.sergeych.lyng.obj.*
+import net.sergeych.lyng.thisAs
 import net.sergeych.lyng.pacman.InlineSourcesImportProvider
 import net.sergeych.mp_tools.globalDefer
 import net.sergeych.tools.bm

lynglib/src/jvmTest/kotlin/BookTest.kt

@@ -178,11 +178,11 @@ suspend fun DocTest.test(_scope: Scope? = null) {
     scope.apply {
         addFn("println") {
             if( bookMode ) {
-                println("${currentTest.fileNamePart}:${currentTest.line}> ${args.map{it.toString(this).value}.joinToString(" ")}")
+                println("${currentTest.fileNamePart}:${currentTest.line}> ${args.map{toStringOf(it).value}.joinToString(" ")}")
             }
             else {
                 for ((i, a) in args.withIndex()) {
-                    if (i > 0) collectedOutput.append(' '); collectedOutput.append(a.toString(this).value)
+                    if (i > 0) collectedOutput.append(' '); collectedOutput.append(toStringOf(a).value)
                     collectedOutput.append('\n')
                 }
             }