lambda: infer functional interface from enum constants (IDEA-97596)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/EnumConstants.java

@@ -0,0 +1,10 @@
+enum Bug {
+    INSTANCE1((Integer x, Integer y) -> x.byteValue()),
+    INSTANCE2((x, y) -> y. byteValue());
+    private Bug(Foo foo) {
+    }
+
+    private interface Foo {
+        byte bar(Integer x, Integer y);
+    }
+}