Fix for bug 412650 - [1.8][compiler]Incongruent Lambda Exception thrown

Signed-off-by: ANIRBAN CHAKRABORTY <anchakrk@in.ibm.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NegativeLambdaExpressionsTest.java b/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NegativeLambdaExpressionsTest.java
index 89c2806815..2fbae531a0 100644
--- a/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NegativeLambdaExpressionsTest.java
+++ b/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NegativeLambdaExpressionsTest.java
@@ -6849,6 +6849,34 @@ public void test412284c() {
 		null /* custom options */
 	);
 }
+// https://bugs.eclipse.org/bugs/show_bug.cgi?id=412650
+// [1.8][compiler]Incongruent Lambda Exception thrown
+public void test412650() {
+	this.runNegativeTest(
+		new String[] {
+				"X.java",
+				"interface I {\n" +
+				"	String sam();\n" +
+				"}\n" +
+				"public class X {\n" +
+				"	static String foo(I i) { return \"\"; }\n" +
+				"	public static void main(String[] args) {\n" +
+				"		foo(() -> foo(X::getInt));\n" +
+				"	}\n" +
+				"	static Integer getInt() { return 0; }\n" +
+				"}\n"
+		},
+		"----------\n" + 
+		"1. ERROR in X.java (at line 7)\n" +
+		"	foo(() -> foo(X::getInt));\n" +
+		"	              ^^^^^^^^^\n" +
+		"The type of getInt() from the type X is Integer, this is incompatible with the descriptor's return type: String\n" + 
+		"----------\n",
+		null /* no extra class libraries */,
+		true /* flush output directory */,
+		null /* custom options */
+	);
+}
 public static Class testClass() {
 	return NegativeLambdaExpressionsTest.class;
 }
diff --git a/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/ReferenceExpression.java b/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/ReferenceExpression.java
index 3090570bfc..b3b4588623 100644
--- a/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/ReferenceExpression.java
+++ b/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/ReferenceExpression.java
@@ -580,6 +580,8 @@ public class ReferenceExpression extends FunctionalExpression implements Invocat
 		try {
 			this.binding = null;
 			resolveType(this.enclosingScope);
+		} catch (IncongruentLambdaException e) {
+			return false;
 		} finally {
 			this.enclosingScope.problemReporter().switchErrorHandlingPolicy(oldPolicy);
 			isCompatible = this.binding != null && this.binding.isValidBinding();