Commits on Jan 31, 2021

1. Improve handling of spans around macro result parse errors …

   Fixes rust-lang#81543
   
   After we expand a macro, we try to parse the resulting tokens as a AST
   node. This commit makes several improvements to how we handle spans when
   an error occurs:
   
   * Only ovewrite the original `Span` if it's a dummy span. This preserves
     a more-specific span if one is available.
   * Use `self.prev_token` instead of `self.token` when emitting an error
     message after encountering EOF, since an EOF token always has a dummy
     span
   * Make `SourceMap::next_point` leave dummy spans unused. A dummy span
     does not have a logical 'next point', since it's a zero-length span.
     Re-using the span span preserves its 'dummy-ness' for other checks

   

   Aaron1011 committed Jan 31, 2021
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