Fix captured range bounds in launched for-loops

examples/tcpserver.lyng

@@ -2,70 +2,55 @@ import lyng.io.net
 
 val host = "127.0.0.1"
 val clientCount = 1000
-val server: TcpServer = Net.tcpListen(0, host, clientCount, true) as TcpServer
-val port: Int = server.localAddress().port
+val server = Net.tcpListen(0, host, clientCount, true) as TcpServer
+val port = server.localAddress().port
 
 fun payloadFor(index: Int): String {
     "$index:${Random.nextInt()}:${Random.nextInt()}"
 }
 
-fun handleClient(client: TcpSocket): String {
+fun handleClient(client: TcpSocket) {
     try {
         val source = client.readLine()
-        if( source == null ) {
-            return "server-eof"
+        if( source != null ) {
+            client.writeUtf8("pong: $source\n")
+            client.flush()
         }
-        val reply = "pong: $source"
-        client.writeUtf8(reply + "\n")
-        client.flush()
-        reply
     } finally {
         client.close()
     }
 }
 
-val serverJob: Deferred = launch {
-    var handlers: List<Deferred> = List()
+launch {
     try {
-        for( i in 0..<1000 ) {
-            val client: TcpSocket = server.accept() as TcpSocket
-            handlers += launch {
+        for( i in 0..<clientCount ) {
+            val client = server.accept() as TcpSocket
+            launch {
                 handleClient(client)
             }
         }
-        handlers.joinAll()
     } finally {
         server.close()
     }
 }
 
-val clientJobs: List<Deferred> = (0..<clientCount).map { index ->
+val replies = (0..<clientCount).map { index ->
     val payload = payloadFor(index)
     launch {
-        val socket: TcpSocket = Net.tcpConnect(host, port) as TcpSocket
+        val socket = Net.tcpConnect(host, port) as TcpSocket
         try {
             socket.writeUtf8(payload + "\n")
             socket.flush()
             val reply = socket.readLine()
-            if( reply == null ) {
-                "client-eof:$payload"
-            }
-            else {
-                assertEquals("pong: $payload", reply)
-                reply
-            }
+            assertEquals("pong: $payload", reply)
+            reply
         } finally {
             socket.close()
         }
     }
-}
-
-val replies = clientJobs.joinAll()
-val serverReplies = serverJob.await() as List<Object>
+}.joinAll()
 
 assertEquals(clientCount, replies.size)
-assertEquals(clientCount, serverReplies.size)
-assertEquals(replies.toSet, serverReplies.toSet)
 
 val summary = "OK: $clientCount concurrent tcp clients"
 println(summary)

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

@@ -7820,7 +7820,9 @@ class BytecodeCompiler(
                 scopeSlotRefPosByKey[scopeKey] = ref.pos()
             }
         }
-        return resolved
+        if (resolved != null) return resolved
+        localSlotIndexByName[ref.name]?.let { return scopeSlotCount + it }
+        return null
     }
 
     private fun resolveLocalSlotByRefOrName(ref: LocalSlotRef): Int? {
@@ -8672,6 +8674,11 @@ class BytecodeCompiler(
                 collectLoopVarNamesRef(ref.targetRef)
                 collectLoopVarNamesRef(ref.indexRef)
             }
+            is RangeRef -> {
+                ref.left?.let { collectLoopVarNamesRef(it) }
+                ref.right?.let { collectLoopVarNamesRef(it) }
+                ref.step?.let { collectLoopVarNamesRef(it) }
+            }
             else -> {}
         }
     }
@@ -8798,6 +8805,11 @@ class BytecodeCompiler(
                 collectScopeSlotsRef(ref.targetRef)
                 collectScopeSlotsRef(ref.indexRef)
             }
+            is RangeRef -> {
+                ref.left?.let { collectScopeSlotsRef(it) }
+                ref.right?.let { collectScopeSlotsRef(it) }
+                ref.step?.let { collectScopeSlotsRef(it) }
+            }
             is ClassOperatorRef -> {
                 collectScopeSlotsRef(ref.target)
             }

lynglib/src/commonTest/kotlin/CoroutinesTest.kt

@@ -199,6 +199,25 @@ class TestCoroutines {
         )
     }
 
+    @Test
+    fun testLaunchCanUseCapturedRangeBoundInForLoop() = runTest {
+        eval(
+            """
+            val count = 8
+            val outer = launch {
+                val jobs = []
+                for( i in 0..<count ) {
+                    val x = i
+                    jobs += launch { x }
+                }
+                jobs.joinAll()
+            }
+
+            assertEquals([0,1,2,3,4,5,6,7], outer.await())
+            """.trimIndent()
+        )
+    }
+
     @Test
     fun testFlows() = runTest {
         eval("""