Invalid co19 enum test

[danrubel]

These co19 tests assert that two consecutive commas tokens in an enum declaration is valid, but I don't believe that it is valid.

• Language/Enums/syntax_t08: CompileTimeError
• Language/Enums/syntax_t09: CompileTimeError

enum E {a,, b}

[lrhn]

It is not valid.

Both tests contain the comment @compile-error, so the test expects a compile-time error.

Are the tests failing anywhere?

[eernstg]

I get this from current master SDK tests/co19_2/src:

> grep -i error Language/Enums/syntax_t0[89].dart
Language/Enums/syntax_t08.dart: * @description Checks that it no compile error if declared constant values
Language/Enums/syntax_t09.dart: * @description Checks that it is no compile error if enum has more then one

I don't like then ;-), but I also don't see any occurrences of @compile-error, so it seems to be a missing fix in the Dart 2 tests. Perhaps the fix was made in the Dart 1 tests after the Dart 2 tests were created (as a copy/adjust operation from the former).