tab completion shouldn't overwrite ) in groovy named arguments

plugins/groovy/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/arguments/GrArgumentLabelImpl.java

@@ -134,7 +134,8 @@ public class GrArgumentLabelImpl extends GroovyPsiElementImpl implements GrArgum
   }
 
   public PsiReference getReference() {
-    return this;
+    final PsiElement name = getNameElement();
+    return name instanceof GrLiteral || name instanceof LeafPsiElement ? this : null;
   }
 
   @Nullable

plugins/groovy/test/org/jetbrains/plugins/groovy/completion/GroovyCompletionTest.groovy

@@ -516,6 +516,18 @@ in<caret>"""
     myFixture.checkResult "def x = []; x.add(<caret>) this"
   }
 
+  public void testEatingClosingParenthesis() {
+    checkCompletion """
+def xxxx = []
+def xxxy = []
+foo((xx<caret>):2)
+""", '\t', """
+def xxxx = []
+def xxxy = []
+foo((xxxx<caret>):2)
+"""
+  }
+
   public void testDontAddStaticImportSecondTime() {
     configure """import static java.lang.String.format
 form<caret>"""