overload resolution: compare functional interfaces for specific if they are not assignable (IDEA-140987)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/overloadResolution/ProperUnrelatedFunctionalInterfacesTypesComparison.java

@@ -0,0 +1,24 @@
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+class Test {
+  private static  <T> T withProject(final Function<ProjectEnvironment, T> calculation) {
+    System.out.println(calculation);
+    return null;
+  }
+
+  private static <T> T <warning descr="Private method 'withProject(java.util.function.Consumer<ProjectEnvironment>)' is never used">withProject</warning>(final Consumer<ProjectEnvironment> calculation){
+    System.out.println(calculation);
+    return null;
+  }
+
+  public static String foo() {
+    return withProject(ProjectEnvironment::getProject);
+  }
+}
+
+class ProjectEnvironment {
+  String getProject() {
+    return null;
+  }
+}