GROOVY-10225

Author: eric-milles

base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/xform/TypeCheckedTests.java

@@ -3555,6 +3555,26 @@ public void testTypeChecked10222a() {
         runConformTest(sources, "works");
     }
 
+    @Test
+    public void testTypeChecked10225() {
+        //@formatter:off
+        String[] sources = {
+            "Main.groovy",
+            "def <T> T m(T t) {\n" +
+            "  print t\n" +
+            "}\n" +
+            "@groovy.transform.TypeChecked\n" +
+            "def <N extends Number, X extends N> void test() {\n" +
+            "  X x = (X) null\n" +
+            "  m(false ? x : (X) null)\n" +
+            "}\n" +
+            "test()\n",
+        };
+        //@formatter:on
+
+        runConformTest(sources, "null");
+    }
+
     @Test
     public void testTypeChecked10235() {
         if (Float.parseFloat(System.getProperty("java.specification.version")) > 8)

base/org.codehaus.groovy25/src/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java

@@ -6336,7 +6336,7 @@ private void resolvePlaceholdersFromImplicitTypeHints(final ClassNode[] actuals,
                 actuals[i] = getLiteralResultType(pt, at, LINKEDHASHMAP_CLASSNODE);
             } else if (a instanceof ConstructorCallExpression) {
                 inferDiamondType((ConstructorCallExpression) a, pt); // GROOVY-10086
-            } else if (a instanceof TernaryExpression && at.isUsingGenerics() && at.getGenericsTypes().length == 0) {
+            } else if (a instanceof TernaryExpression && at.getGenericsTypes() != null && at.getGenericsTypes().length == 0) {
                 // GROOVY-9983: double diamond scenario -- "m(flag ? new Type<>(...) : new Type<>(...))"
                 typeCheckingContext.pushEnclosingBinaryExpression(assignX(varX(p), a, a));
                 a.visit(this); // re-visit with target type witness

base/org.codehaus.groovy30/src/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java

@@ -5960,7 +5960,7 @@ private void resolvePlaceholdersFromImplicitTypeHints(final ClassNode[] actuals,
                 actuals[i] = getLiteralResultType(pt, at, LINKEDHASHMAP_CLASSNODE);
             } else if (a instanceof ConstructorCallExpression) {
                 inferDiamondType((ConstructorCallExpression) a, pt); // GROOVY-10086
-            } else if (a instanceof TernaryExpression && at.isUsingGenerics() && at.getGenericsTypes().length == 0) {
+            } else if (a instanceof TernaryExpression && at.getGenericsTypes() != null && at.getGenericsTypes().length == 0) {
                 // GROOVY-9983: double diamond scenario -- "m(flag ? new Type<>(...) : new Type<>(...))"
                 typeCheckingContext.pushEnclosingBinaryExpression(assignX(varX(p), a, a));
                 a.visit(this); // re-visit with target type witness

base/org.codehaus.groovy40/src/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java

@@ -5537,7 +5537,7 @@ private void resolvePlaceholdersFromImplicitTypeHints(final ClassNode[] actuals,
                 actuals[i] = getLiteralResultType(pt, at, LinkedHashMap_TYPE);
             } else if (a instanceof ConstructorCallExpression) {
                 inferDiamondType((ConstructorCallExpression) a, pt); // GROOVY-10086
-            } else if (a instanceof TernaryExpression && at.isUsingGenerics() && at.getGenericsTypes().length == 0) {
+            } else if (a instanceof TernaryExpression && at.getGenericsTypes() != null && at.getGenericsTypes().length == 0) {
                 // GROOVY-9983: double diamond scenario -- "m(flag ? new Type<>(...) : new Type<>(...))"
                 typeCheckingContext.pushEnclosingBinaryExpression(assignX(varX(p), a, a));
                 a.visit(this); // re-visit with target type witness