make method static: warn about broken method references if filed or class need to be passed; NPE (EA-66661 - NPE: MakeMethodStaticProcessor.changeExternalUsage)

java/java-tests/testData/refactoring/makeMethodStatic/afterThisMethodReference.java

@@ -0,0 +1,10 @@
+class Test4 {
+    void test() {
+        Runnable f = Test4::yyy;
+    }
+    
+    String myField = "";
+    static void yyy() {
+        System.out.println(myField);
+    }
+}

java/java-tests/testData/refactoring/makeMethodStatic/beforeThisMethodReference.java

@@ -0,0 +1,10 @@
+class Test4 {
+    void test() {
+        Runnable f = this::yyy;
+    }
+    
+    String myField = "";
+    void yy<caret>y() {
+        System.out.println(myField);
+    }
+}