static interface methods: forbid on instance members, inheritors (IDEA-107794)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/interfaceMethods/StaticMethodCalls.java

@@ -0,0 +1,25 @@
+
+class Bug {
+
+  interface Function<T, R> {
+    public R apply(T t);
+
+    static <K> Function<K, K> identity() {
+      return k -> k;
+    }
+  }
+
+  interface IFunction extends Function<Integer, Integer> {
+    static void a() {
+      Function<Integer, Integer> identity = <error descr="Static method may be invoked on containing interface class only">identity();</error>
+    }
+  }
+
+  public void foo() {
+    Function<Integer, Integer> f = Function.identity();
+
+    Function<Integer, Integer> g = <error descr="Static method may be invoked on containing interface class only">f.identity();</error>
+
+    Function<Integer, Integer> h = <error descr="Static method may be invoked on containing interface class only">IFunction.identity();</error>
+  }
+}