Robert Widmann f807dfe9e3 Parse @_typeSequence in Generic Parameter Position ...

Stage in the parsing for this attribute, nothing else.

Motivated by two important reasons:

1) The pitch for variadic generics does not lay down a concrete syntax
   for variadic generic parameters.
2) Paring T... and T* needlessly complicate the lexer as we must now
   disambiguate them with respect to other internal operator characters
   (e.g. `T...>` must lex as `(T...)>` and not `T ...>`

Which itself adds another motivation

3) We need to start parsing this attribute *now* to avoid condfail'ing
   ourselves later.

2021-11-02 14:42:12 -07:00

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