java highlighting: give up check of @PolymorphicSignature methods (IDEA-251449)

GitOrigin-RevId: cf986ee46e52d6cabfc309776559481d42e6c5ce

java/java-psi-api/src/com/intellij/psi/PsiMethodReferenceUtil.java

@@ -1,6 +1,7 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.psi;
 
+import com.intellij.codeInsight.AnnotationUtil;
 import com.intellij.core.JavaPsiBundle;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.util.NlsContexts;
@@ -162,6 +163,12 @@ public final class PsiMethodReferenceUtil {
         return false;
       }
 
+      PsiElement element = result.getElement();
+      if (element instanceof PsiMethod && 
+          AnnotationUtil.isAnnotated(((PsiMethod)element), CommonClassNames.JAVA_LANG_INVOKE_MH_POLYMORPHIC, 0)) {
+        return true;
+      }
+
       if (TypeConversionUtil.isAssignable(interfaceReturnType, methodReturnType)) {
         return true;
       }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newMethodRef/ReferencesToPolymorphicMethod.java

@@ -0,0 +1,10 @@
+import java.lang.invoke.MethodHandle;
+
+class MyTest {
+  private void m(MethodHandle handle) {
+    I stringSupplier = handle::invokeExact;
+  }
+}
+interface I {
+  String n() throws Throwable;
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/lambda/NewMethodRefHighlightingTest.java

@@ -197,6 +197,7 @@ public class NewMethodRefHighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testVoidConflict() { doTest(); }
   public void testCreateMethodFromMethodRefApplicability() { doTest(); }
   public void testErrorMessageOnTopCallWhenFunctionalInterfaceIsNotInferred() { doTest(); }
+  public void testReferencesToPolymorphicMethod() { doTest(); }
 
   private void doTest() {
     doTest(false);