'val' in 'when' subject can't have modifiers (annotations are ok)

compiler/psi/src/org/jetbrains/kotlin/parsing/KotlinExpressionParsing.java

@@ -850,7 +850,7 @@ public class KotlinExpressionParsing extends AbstractKotlinParsing {
             advanceAt(LPAR);
 
             PsiBuilder.Marker atWhenStart = mark();
-            myKotlinParsing.parseModifierList(DEFAULT, TokenSet.create(EQ, RPAR));
+            myKotlinParsing.parseAnnotationsList(DEFAULT, TokenSet.create(EQ, RPAR));
             if (at(VAL_KEYWORD) || at(VAR_KEYWORD)) {
                 IElementType declType = myKotlinParsing.parseProperty(KotlinParsing.PropertyParsingMode.LOCAL);
 

compiler/psi/src/org/jetbrains/kotlin/parsing/KotlinParsing.java

@@ -460,6 +460,13 @@ public class KotlinParsing extends AbstractKotlinParsing {
         return parseModifierList(null, annotationParsingMode, noModifiersBefore);
     }
 
+    boolean parseAnnotationsList(
+            @NotNull AnnotationParsingMode annotationParsingMode,
+            @NotNull TokenSet noModifiersBefore
+    ) {
+        return doParseModifierList(null, TokenSet.EMPTY, annotationParsingMode, noModifiersBefore);
+    }
+
     /**
      * (modifier | annotation)*
      *