diff --git a/compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt b/compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt
index af5aa99da..5f53595eb 100644
--- a/compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt
+++ b/compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt
@@ -39,7 +39,7 @@ internal object C64MachineDefinition: IMachineDefinition {
         for(emulator in listOf("x64sc", "x64")) {
             println("\nStarting C-64 emulator $emulator...")
             val cmdline = listOf(emulator, "-silent", "-moncommands", "$programName.vice-mon-list",
-                    "-autostartprgmode", "1", "-autostart-warp", "-autostart", programName + ".prg")
+                    "-autostartprgmode", "1", "-autostart-warp", "-autostart", "$programName.prg")
             val processb = ProcessBuilder(cmdline).inheritIO()
             val process: Process
             try {
diff --git a/compiler/src/prog8/optimizer/StatementOptimizer.kt b/compiler/src/prog8/optimizer/StatementOptimizer.kt
index 50703d8dc..10dff59ab 100644
--- a/compiler/src/prog8/optimizer/StatementOptimizer.kt
+++ b/compiler/src/prog8/optimizer/StatementOptimizer.kt
@@ -27,7 +27,11 @@ internal class StatementOptimizer(private val program: Program,
 
     override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
         for(returnvar in subsThatNeedReturnVariable) {
-            val decl = VarDecl(VarDeclType.VAR, returnvar.second, ZeropageWish.DONTCARE, null, retvarName, null, false, true, returnvar.third)
+            val decl = VarDecl(VarDeclType.VAR, returnvar.second, ZeropageWish.DONTCARE, null, retvarName, null,
+                isArray = false,
+                autogeneratedDontRemove = true,
+                position = returnvar.third
+            )
             returnvar.first.statements.add(0, decl)
         }
         subsThatNeedReturnVariable.clear()
diff --git a/compilerAst/src/prog8/ast/AstToplevel.kt b/compilerAst/src/prog8/ast/AstToplevel.kt
index 2ac43b654..40a5c940d 100644
--- a/compilerAst/src/prog8/ast/AstToplevel.kt
+++ b/compilerAst/src/prog8/ast/AstToplevel.kt
@@ -293,8 +293,7 @@ class Program(val name: String,
             )
             internedStringsBlock.statements.add(decl)
             decl.linkParents(internedStringsBlock)
-            val scopedName = listOf(internedStringsModuleName, decl.name)
-            return scopedName
+            return listOf(internedStringsModuleName, decl.name)
         }
 
         val key = Pair(string.value, string.altEncoding)
diff --git a/compilerAst/src/prog8/ast/statements/AstStatements.kt b/compilerAst/src/prog8/ast/statements/AstStatements.kt
index b09cd3d02..4bdd35734 100644
--- a/compilerAst/src/prog8/ast/statements/AstStatements.kt
+++ b/compilerAst/src/prog8/ast/statements/AstStatements.kt
@@ -537,7 +537,7 @@ class InlineAssembly(val assembly: String, override val position: Position) : St
 
 class AnonymousScope(override var statements: MutableList<Statement>,
                      override val position: Position) : INameScope, Statement() {
-    override val name: String
+    override val name: String = "<anon-$sequenceNumber>"
     override lateinit var parent: Node
 
     companion object {
@@ -545,7 +545,7 @@ class AnonymousScope(override var statements: MutableList<Statement>,
     }
 
     init {
-        name = "<anon-$sequenceNumber>"     // make sure it's an invalid soruce code identifier so user source code can never produce it
+        // make sure it's an invalid soruce code identifier so user source code can never produce it
         sequenceNumber++
     }
 
diff --git a/compilerAst/src/prog8/ast/walk/AstWalker.kt b/compilerAst/src/prog8/ast/walk/AstWalker.kt
index fff0ba2f6..194b1f2e6 100644
--- a/compilerAst/src/prog8/ast/walk/AstWalker.kt
+++ b/compilerAst/src/prog8/ast/walk/AstWalker.kt
@@ -175,7 +175,7 @@ abstract class AstWalker {
     fun applyModifications(): Int {
         // check if there are double removes, keep only the last one
         val removals = modifications.filter { it.first is IAstModification.Remove }
-        if(removals.size>0) {
+        if(removals.isNotEmpty()) {
             val doubles = removals.groupBy { (it.first as IAstModification.Remove).node }.filter { it.value.size>1 }
             doubles.forEach {
                 for(doubleRemove in it.value.dropLast(1)) {
diff --git a/compilerAst/src/prog8/parser/ModuleParsing.kt b/compilerAst/src/prog8/parser/ModuleParsing.kt
index edf695e6a..87eba5d40 100644
--- a/compilerAst/src/prog8/parser/ModuleParsing.kt
+++ b/compilerAst/src/prog8/parser/ModuleParsing.kt
@@ -25,7 +25,10 @@ fun moduleName(fileName: Path) = fileName.toString().substringBeforeLast('.')
 internal fun pathFrom(stringPath: String, vararg rest: String): Path  = FileSystems.getDefault().getPath(stringPath, *rest)
 
 
-class ModuleImporter(val program: Program, val encoder: IStringEncoding, val compilationTargetName: String, val libdirs: List<String>) {
+class ModuleImporter(private val program: Program,
+                     private val encoder: IStringEncoding,
+                     private val compilationTargetName: String,
+                     private val libdirs: List<String>) {
 
     fun importModule(filePath: Path): Module {
         print("importing '${moduleName(filePath.fileName)}'")