improved variable source line position

codeGenIntermediate/src/prog8/codegen/intermediate/StConvert.kt

@@ -2,6 +2,7 @@ package prog8.codegen.intermediate
 
 import prog8.code.*
 import prog8.code.ast.PtStructField
+import prog8.code.core.Position
 import prog8.intermediate.*
 
 /**
@@ -78,7 +79,7 @@ private class StToIrConverter(val romable: Boolean) {
         val hasInit = initValue != null
         val inBss = !hasInit || romable
         val readonly = romable && hasInit
-        return IRStStaticVariable(name, variable.dt, initValue, variable.length, variable.zpwish, variable.align, variable.dirty, inBss, readonly, variable.shared)
+        return IRStStaticVariable(name, variable.dt, initValue, variable.length, variable.zpwish, variable.align, variable.dirty, inBss, readonly, variable.shared, variable.astNode?.position ?: Position.DUMMY)
     }
 
     fun convert(variable: StMemVar): IRStMemVar {

codeGenIntermediate/src/prog8/codegen/intermediate/StackFrameLayout.kt

@@ -516,7 +516,7 @@ class StackFrameLayout(private val program: IRProgram, private val errors: IErro
             locals += LocalLayout(name, elemDt, count, size, alignment, v.dirty, initialized, isFloat)
             if (v.length != null && size > 8 && !v.dirty && v.initializationValue == null) {
                 val shortName = name.substringAfterLast('.').removePrefix("p8v_")
-                errors.warn("local array '$shortName' ($size bytes) in subroutine '${userName(sub)}' is zero-initialized on every call which can be costly; consider @dirty if you assign it before use", sub.position)
+                errors.warn("local array '$shortName' ($size bytes) in subroutine '${userName(sub)}' is zero-initialized on every call which can be costly; consider @dirty if you assign it before use", v.position)
             }
         }