diff --git a/compilerAst/src/prog8/ast/statements/AstStatements.kt b/compilerAst/src/prog8/ast/statements/AstStatements.kt
index 41638d5d4..8e62da38f 100644
--- a/compilerAst/src/prog8/ast/statements/AstStatements.kt
+++ b/compilerAst/src/prog8/ast/statements/AstStatements.kt
@@ -130,7 +130,7 @@ data class Label(override val name: String, override val position: Position) : S
     override fun toString()= "Label(name=$name, pos=$position)"
 }
 
-class Return(var value: Expression?, final override val position: Position) : Statement() {
+class Return(var value: Expression?, override val position: Position) : Statement() {
     override lateinit var parent: Node
 
     override fun linkParents(parent: Node) {
@@ -181,7 +181,7 @@ class VarDecl(val type: VarDeclType,
                    val autogeneratedDontRemove: Boolean,
                    val sharedWithAsm: Boolean,
                    val subroutineParameter: SubroutineParameter?,
-                   final override val position: Position) : Statement(), INamedStatement {
+                   override val position: Position) : Statement(), INamedStatement {
     override lateinit var parent: Node
     var allowInitializeWithZero = true
 
@@ -299,7 +299,7 @@ class ArrayIndex(var indexExpr: Expression,
     override fun copy() = ArrayIndex(indexExpr.copy(), position)
 }
 
-class Assignment(var target: AssignTarget, var value: Expression, final override val position: Position) : Statement() {
+class Assignment(var target: AssignTarget, var value: Expression, override val position: Position) : Statement() {
     override lateinit var parent: Node
 
     override fun linkParents(parent: Node) {
diff --git a/compilerAst/src/prog8/ast/walk/AstWalker.kt b/compilerAst/src/prog8/ast/walk/AstWalker.kt
index aeacf1160..fc8c23cb1 100644
--- a/compilerAst/src/prog8/ast/walk/AstWalker.kt
+++ b/compilerAst/src/prog8/ast/walk/AstWalker.kt
@@ -233,7 +233,7 @@ abstract class AstWalker {
     fun visit(containment: ContainmentCheck, parent: Node) {
         track(before(containment, parent), containment, parent)
         containment.element.accept(this, containment)
-        containment.iterable?.accept(this, containment)
+        containment.iterable.accept(this, containment)
         track(after(containment, parent), containment, parent)
     }
 
diff --git a/compilerInterfaces/src/prog8/compilerinterface/Zeropage.kt b/compilerInterfaces/src/prog8/compilerinterface/Zeropage.kt
index f972613ae..8950af059 100644
--- a/compilerInterfaces/src/prog8/compilerinterface/Zeropage.kt
+++ b/compilerInterfaces/src/prog8/compilerinterface/Zeropage.kt
@@ -50,7 +50,7 @@ abstract class Zeropage(protected val options: CompilationOptions) {
                             if(position!=null)
                                 errors.warn("allocated a large value (float) in zeropage", position)
                             else
-                                errors.warn("$scopedname: allocated a large value (float) in zeropage", position ?: Position.DUMMY)
+                                errors.warn("$scopedname: allocated a large value (float) in zeropage", Position.DUMMY)
                             options.compTarget.machine.FLOAT_MEM_SIZE
                         } else throw InternalCompilerException("floating point option not enabled")
                     }