IDEA-113590 annotations as annotation values

plugins/groovy/src/org/jetbrains/plugins/groovy/annotator/GroovyAnnotator.java

@@ -1430,6 +1430,7 @@ public class GroovyAnnotator extends GroovyElementVisitor {
   private boolean checkAnnotationAttributeValue(GrAnnotationMemberValue value, PsiElement toHighlight) {
     if (value instanceof GrLiteral) return false;
     if (value instanceof GrClosableBlock) return false;
+    if (value instanceof GrAnnotation) return false;
 
     if (value instanceof GrReferenceExpression) {
       PsiElement resolved = ((GrReferenceExpression)value).resolve();

plugins/groovy/test/org/jetbrains/plugins/groovy/lang/highlighting/GroovyHighlightingTest.groovy

@@ -1600,4 +1600,22 @@ def groovy2 = '''print <error descr="String end expected">'abc\\\\' </error>'''
 
 """)
   }
+
+  void testAnnotationAsAnnotationValue() {
+    testHighlighting('''\
+@interface A {}
+@interface B {
+  A[] foo()
+}
+@interface C {
+  A foo()
+}
+
+@B(foo = @A)
+@B(foo = [@A])
+@C(foo = @A)
+@C(foo = <error descr="Cannot assign 'Integer' to 'A'">2</error>)
+def foo
+''')
+  }
 }