Reject trailing tokens after declaration

[jcaesar]

Current venial parses struct Good {} bad and silently ignores bad or any other trailing junk tokens. I'm not sure what the best way to deal with that is, but I think that should be an error.

(Origin issue: jcaesar/structstruck#4)

[Bromeon]

Good catch! 👍

[PoignardAzur]

At a glance, I think my preferred solution would be to have two separate consume_declaration and parse_declaration functions. Will handle it when I have the time.

[jcaesar]

@PoignardAzur How about just making parse_declaration_tokens public? (I'd argue that if you hand ownership of a list of tokens, you'd want them to be fully consumed.)

[PoignardAzur]

Right, I wasn't up-to-date on that part of the code.

[PoignardAzur]

I created #44 based on your PR. I think it addresses all your concerns?

[jcaesar]

Tested it, does.