EA-26355: don't produce wildcards in gdsl

plugins/groovy/resources/standardDsls/defaultMethods.gdsl

@@ -25,6 +25,7 @@ import static standardDsls.Constants.STRING
 interface Constants {
   String NUMBER = "java.lang.Number"
   String STRING = "java.lang.String"
+  String WILDCARD_PREFIX = "? extends "
 }
 
 def extractTypeParameter(def typeText) {
@@ -32,8 +33,13 @@ def extractTypeParameter(def typeText) {
   final int end = typeText.lastIndexOf('>')
 
   if (start < 0) return null
-  if (end < 0) return typeText.substring(start + 1)
-  return typeText.substring(start + 1, end);
+
+  String componentType = end < 0 ? typeText.substring(start + 1) : typeText.substring(start + 1, end)
+  if (componentType.startsWith(Constants.WILDCARD_PREFIX)) {
+    componentType = componentType.substring(Constants.WILDCARD_PREFIX.size())
+  }
+
+  return componentType;
 }
 
 def constructElementTypeArg(def psiType) {

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

@@ -346,6 +346,10 @@ public class GroovyHighlightingTest extends LightCodeInsightFixtureTestCase {
     doTest(new GroovyResultOfAssignmentUsedInspection());
   }
 
+  public void testGdslWildcardTypes() {
+    myFixture.configureByText("a.groovy", "List<? extends String> l = []; l.get(1)");
+    myFixture.checkHighlighting(true, false, false);
+  }
 
   public void testThisTypeInStaticContext() {
     doTest(new GroovyAssignabilityCheckInspection());