Fix duplicate stdlib import redefinition

lyng/src/jvmTest/kotlin/net/sergeych/CliLocalModuleImportRegressionJvmTest.kt

@@ -0,0 +1,44 @@
+package net.sergeych
+
+import kotlinx.coroutines.runBlocking
+import java.nio.file.Files
+import kotlin.io.path.writeText
+import kotlin.test.Test
+
+class CliLocalModuleImportRegressionJvmTest {
+
+    @Test
+    fun localModuleUsingLaunchAndNetImportsWithoutStdlibRedefinition() = runBlocking {
+        val root = Files.createTempDirectory("lyng-cli-import-regression")
+        try {
+            val packageDir = Files.createDirectories(root.resolve("package1"))
+            val mainFile = root.resolve("main.lyng")
+            val alphaFile = packageDir.resolve("alpha.lyng")
+
+            mainFile.writeText(
+                """
+                import package1.alpha
+
+                println("ok")
+                """.trimIndent()
+            )
+            alphaFile.writeText(
+                """
+                import lyng.io.net
+
+                class Alpha {
+                    fn startListen(port, host) {
+                        launch {
+                            println(port, host)
+                        }
+                    }
+                }
+                """.trimIndent()
+            )
+
+            executeFile(mainFile.toString(), emptyList())
+        } finally {
+            root.toFile().deleteRecursively()
+        }
+    }
+}

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

@@ -94,7 +94,11 @@ class ModuleScope(
                 if (newName != null) {
                     val existing = scope.objects[newName]
                     if (existing != null) {
-                        if (existing.importedFrom != record.importedFrom)
+                        val sameBinding =
+                            existing === record ||
+                            existing.importedFrom == record.importedFrom ||
+                            existing.value === record.value
+                        if (!sameBinding)
                             scope.raiseError("symbol ${existing.importedFrom?.packageName}.$newName already exists, redefinition on import is not allowed")
                         // already imported
                     } else {