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Optimize `rustc_lexer`
The `cursor.first()` method in `rustc_lexer` now calls the `chars.next()` method instead of `chars.nth_char(0)`.
This allows LLVM to optimize the code better. The biggest win is that `eat_while()` is now fully inlined and generates better assembly. This improves the lexer's performance by 35% in a micro-benchmark I made (Lexing all 18MB of code in the compiler directory). But lexing is only a small part of the overall compilation time, so I don't know how significant it is.
Big thanks to criterion and `cargo asm`.
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and optimize the iterator returned by `tokenize().
This improves lexer performance by 35%
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In the lexer, consider emojis to be valid identifiers and reject
them later to avoid knock down parse errors.
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Co-authored-by: Niko Matsakis <niko@alum.mit.edu>
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This commit denies any identifiers immediately followed by
one of three tokens `"`, `'` or `#`, which is stricter than
the requirements of RFC 3101 but may be necessary according
to the discussion at [Zulip].
[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/268952-edition-2021/topic/reserved.20prefixes/near/238470099
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Changes `librustc_X` to `rustc_X`, only in documentation comments.
Plain code comments are left unchanged.
Also fix incorrect file paths.
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UTF8 bytes.
Fixed it by inlining it in the two places where the count is used and simplified the logic there.
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Also add an Oxford comma while we're editing that line.
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Lexer now discerns between regular comments and doc comments, so use that.
The change only affects the choice of reported errors.
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