Missing corresponding changes to dart:mirrors

[rmacnak-google]

The proposal omits the corresponding changes to dart:mirrors. Presumably this would be something like adding MethodMirror.typeVariables.

[leafpetersen]

Interesting point. The spec mentions reflection and mirrors in passing, but doesn't actually include it in the specification of the language as far as I can tell, so I'm actually not clear whether DEPs are supposed to cover the corresponding dart:mirrors API changes as well. I don't see any mirrors discussion in any of the other DEPs, but the two accepted ones so far don't really touch on anything that gets reflected in mirrors (assuming that tear-offs don't require any special treatment). In any case, I'll be happy to take a whack at sorting out what the mirrors API for this should look like if this is something we want to nail down as part of the DEP docs.