further Arguments optimizations

library/src/commonMain/kotlin/net/sergeych/lyng/ArgsDeclaration.kt

@@ -74,7 +74,7 @@ data class ArgsDeclaration(val params: List<Item>, val endTokenType: Token.Type)
         fun processEllipsis(index: Int, toFromIndex: Int) {
             val a = params[index]
             val l = if (index > toFromIndex) ObjList()
-            else ObjList(fromArgs.values.subList(index, toFromIndex + 1).toMutableList())
+            else ObjList(fromArgs.list.subList(index, toFromIndex + 1).toMutableList())
             assign(a, l)
         }
 

library/src/commonMain/kotlin/net/sergeych/lyng/Arguments.kt

@@ -28,12 +28,8 @@ suspend fun Collection<ParsedArgument>.toArguments(context: Context): Arguments
 
 data class Arguments(val list: List<Obj>) : List<Obj> by list {
 
-    data class Info(val value: Obj, val pos: Pos)
-
-    val values = list
-
-    fun firstAndOnly(): Obj {
-        if (list.size != 1) throw IllegalArgumentException("Expected one argument, got ${list.size}")
+    fun firstAndOnly(pos: Pos = Pos.UNKNOWN): Obj {
+        if (list.size != 1) throw ScriptError(pos, "expected one argument, got ${list.size}")
         return list.first()
     }
 

library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -379,7 +379,7 @@ class Compiler(
             val context = closure!!.copy(pos, args)
             if (argsDeclaration == null) {
                 // no args: automatic var 'it'
-                val l = args.values
+                val l = args.list
                 val itValue: Obj = when (l.size) {
                     // no args: it == void
                     0 -> ObjVoid