testdata for IDEA-127215

java/java-psi-api/src/com/intellij/psi/infos/MethodCandidateInfo.java

@@ -256,7 +256,11 @@ public class MethodCandidateInfo extends CandidateInfo{
   public PsiSubstitutor getSubstitutor(boolean includeReturnConstraint) {
     PsiSubstitutor substitutor = myCalcedSubstitutor;
     if (substitutor == null || !includeReturnConstraint && myLanguageLevel.isAtLeast(LanguageLevel.JDK_1_8) || isOverloadCheck()) {
-      myInferenceError = null;
+
+      if (includeReturnConstraint) {
+        myInferenceError = null;
+      }
+
       PsiSubstitutor incompleteSubstitutor = super.getSubstitutor();
       PsiMethod method = getElement();
       if (myTypeArguments == null) {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newLambda/IDEA127215.java

@@ -0,0 +1,31 @@
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Function;
+
+import static java.util.stream.Collectors.toList;
+
+
+abstract class FooBar<M> {
+
+  abstract void collect(List<? extends M> collector);
+
+  void foo(FooBar<?> objectStream) {
+    objectStream. collect(toList( ));
+
+  }
+
+  static <T> List<T> toList() {
+    return null;
+  }
+
+}
+class Test {
+  <T> List<List<Object>> foo(List<T> objects, Function<T, ?>... functions) {
+    return objects.stream()
+      .map(object -> Arrays.stream(functions)
+        .map(fn -> fn.apply(object))
+        .collect(toList()))
+      .collect(toList<error descr="'toList()' in 'java.util.stream.Collectors' cannot be applied to '()'">()</error>);
+  }
+}

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

@@ -240,6 +240,10 @@ public class NewLambdaHighlightingTest extends LightDaemonAnalyzerTestCase {
     doTest();
   }
 
+  public void testIDEA127215() throws Exception {
+    doTest();
+  }
+
   private void doTest() {
     doTest(false);
   }