Move more parser tests to syntax tests

test/libsolidity/syntaxTests/parsing/enum_valid_declaration.sol

@@ -0,0 +1,10 @@
+contract c {
+    enum validEnum { Value1, Value2, Value3, Value4 }
+    function c() {
+        a = validEnum.Value3;
+    }
+    validEnum a;
+}
+// ----
+// Warning: (71-121): Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
+// Warning: (71-121): No visibility specified. Defaulting to "public".