don't show synthetic methods in groovy structure view

java/java-psi-impl/java-psi-impl.iml

@@ -12,6 +12,7 @@
     <orderEntry type="module" module-name="resources-en" />
     <orderEntry type="library" name="Guava" level="project" />
     <orderEntry type="library" name="asm" level="project" />
+    <orderEntry type="module" module-name="lang-api" />
   </component>
 </module>
 

java/java-psi-impl/src/com/intellij/psi/impl/PsiImplUtil.java

@@ -530,4 +530,8 @@ public class PsiImplUtil {
     PsiParameter[] parameters = method.getParameterList().getParameters();
     return parameters.length > 0 && parameters[parameters.length - 1].isVarArgs();
   }
+
+  public static PsiElement handleMirror(PsiElement element) {
+    return element instanceof PsiMirrorElement ? ((PsiMirrorElement)element).getPrototype() : element;
+  }
 }