[PATCH for Dlang support] Fixes for issues 84 and 88

[Adela Vais]

Hello Akim,

Here are the patches for the syntax error that appeared when using `%code
lexer` (issue 84) and the toString method of SymbolKind (issue 88).
I used the latest DMD public release, 2.100.2.

I used the proposed solutions created by ledaniel2. I'll let you handle the
author attribution for these patches.

I want to follow up with a test for the second patch, most probably next
week. I think that one possible test that could use the function can be
created through
https://github.com/adelavais/bison/blob/master/tests/regression.at#L1724 in
combination with functions from the local.at file, so I will look into this.

Thank you,
Adela

0002-d-fix-syntax-error-on-SymbolKind.toString-method.patch
Description: Source code patch

0001-d-fix-interface-syntax-error.patch
Description: Source code patch