bors 9212108a9b Auto merge of - petrochenkov:cmpctxt, r=cjgillot
rustc_span: Optimize syntax context comparisons

Including comparisons with root context.

- `eq_ctxt` doesn't require retrieving full `SpanData`, or taking the span interner lock twice.
- Checking `SyntaxContext` for "rootness" is cheaper than extracting a full outer `ExpnData` for it and checking *it* for rootness.

The internal lint for `eq_ctxt` is also tweaked to detect `a.ctxt() != b.ctxt()` in addition to `a.ctxt() == b.ctxt()`.
2024-01-06 13:51:01 +00:00
..
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