IDEA-112222 Validate @Contract annotation is related to the code

java/java-tests/testData/inspection/dataFlow/contractCheck/NotNullStringLiteral.java

@@ -0,0 +1,11 @@
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.Nullable;
+
+class Foo {
+  @Nullable
+  @Contract ( "_ -> null")
+  String foo(String s) {
+    return <warning descr="Contract clause '_ -> null' is violated">"42"</warning>;
+  }
+
+}