[Issue 14679] Parse uninstantiated generic artifacts lazily

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14679

--- Comment #3 from Andrei Alexandrescu <andrei at erdani.com> ---
Yah, the alternate grammar needs to recognize comments, string literals, and
newlines (for line counting purposes).

One nice thing about not doing tokenization is a lot of memory is saved.

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