trivial method ref: check if qualifier is of assignable type (IDEA-154422)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/trivialMethodReference/beforeOnUnassignable.java

@@ -0,0 +1,14 @@
+// "Replace with qualifier" "false"
+class Test {
+  nterface A {
+    void m();
+  }
+
+  interface B extends A {}
+
+  void foo(B b) {}
+
+  void bar(A a){
+    foo(a::<caret>m);
+  }
+}