redundant cast: special processing for functional expressions as enum args (IDEA-154354)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/redundantCast/EnumConstantWithFunctionalExpressionArg.java

@@ -0,0 +1,12 @@
+import java.util.function.Supplier;
+
+enum E {
+  A(  (<warning descr="Casting 'E::f' to 'Supplier<Object>' is redundant">Supplier<Object></warning>)E::f),
+  B(  (Supplier<String>)E::f),
+  ;
+  <T> E(Supplier<T> s){}
+
+  static <K> K f() {
+    return null;
+  }
+}