diff --git a/compiler/res/version.txt b/compiler/res/version.txt
index bf77d5496..a5c5a84c4 100644
--- a/compiler/res/version.txt
+++ b/compiler/res/version.txt
@@ -1 +1 @@
-4.2
+4.3-SNAPSHOT
diff --git a/compiler/src/prog8/ast/processing/AstChecker.kt b/compiler/src/prog8/ast/processing/AstChecker.kt
index 77adc6392..a4c58bb1f 100644
--- a/compiler/src/prog8/ast/processing/AstChecker.kt
+++ b/compiler/src/prog8/ast/processing/AstChecker.kt
@@ -742,6 +742,11 @@ internal class AstChecker(private val program: Program,
             checkValueTypeAndRangeArray(array.type.typeOrElse(DataType.STRUCT), null, arrayspec, array)
         }
 
+        if(!array.value.all { it.constValue(program)!=null }) {
+            // TODO for now, array literals have to consist of all compile time constant values...
+            errors.err("array literal doesn't consist of only compile time constant values", array.position)
+        }
+
         super.visit(array)
     }
 
@@ -1098,7 +1103,7 @@ internal class AstChecker(private val program: Program,
         }
 
         if(value.type.isUnknown)
-            return err("attempt to check values of array with as yet unknown datatype")
+            return false
 
         when (targetDt) {
             DataType.STR -> return err("string value expected")
diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index e3c2c5f2f..6d102c44e 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -5,6 +5,7 @@ TODO
 - get rid of all other TODO's in the code ;-)
 - line-circle-gfx examples are now a few hundred bytes larger than before. Why is that, can it be fixed?
 - compiler errors and warnings in standard format so the IDE shows them as clickable links; ./test.asm:2578:3: blablabla
+- make it possible for array literals to not only contain compile time constants
 - further optimize assignment codegeneration
 - auto select correct library to import based on target, instead of having c64- and  cx16-  prefix variants
 - implement @stack for asmsub parameters