new inference: diamond in lambda return workaround

java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/constraints/ExpressionCompatibilityConstraint.java

@@ -116,7 +116,8 @@ public class ExpressionCompatibilityConstraint extends InputOutputConstraintForm
               params[i] = typeParams[i];
             }
           }
-          final PsiSubstitutor siteSubstitutor = resolveResult instanceof MethodCandidateInfo ? ((MethodCandidateInfo)resolveResult).getSiteSubstitutor() : PsiSubstitutor.EMPTY;
+          final PsiSubstitutor siteSubstitutor = resolveResult instanceof MethodCandidateInfo && method != null && !method.isConstructor() 
+                                                 ? ((MethodCandidateInfo)resolveResult).getSiteSubstitutor() : PsiSubstitutor.EMPTY;
           for (PsiTypeParameter typeParameter : siteSubstitutor.getSubstitutionMap().keySet()) {
             substitutor = substitutor.put(typeParameter, substitutor.substitute(siteSubstitutor.substitute(typeParameter)));
           }

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

@@ -0,0 +1,9 @@
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+class Test {
+  Set<String> collect(Stream<String> map){
+    return map.collect(Collectors.toCollection(() -> new LinkedHashSet<>()));
+  }
+}

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

@@ -138,6 +138,10 @@ public class NewLambdaHighlightingTest extends LightDaemonAnalyzerTestCase {
     doTest();
   }
 
+  public void testDiamondInLambdaReturn() throws Exception {
+    doTest();
+  }
+
   private void doTest() {
     doTest(false);
   }