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                                            Rust timing bot

Improve lexer performance by 5-10% overall, improve string lexer performance 15%

Awaiting bors try build completion. @rustbot label: +S-waiting-on-perf

Improve lexer performance by 5-10% overall, improve string lexer performance 15%

Queued ebcec0ca2149d940a145c9cf3403cdc2c09da563 with parent ee447067e18f07aa6ee67dcf0ddc7b07eb675672, future [comparison URL](https://perf.rust-lang.org/compare.html?start=ee447067e18f07aa6ee67dcf0ddc7b07eb675672&end=ebcec0ca2149d940a145c9cf3403cdc2c09da563). There are currently 0 preceding artifacts in the [queue](https://perf.rust-lang.org/status.html). It will probably take at least ~1.0 hours until the benchmark run finishes.

Improve lexer performance by 5-10% overall, improve string lexer performance 15%

Finished benchmarking commit (ebcec0ca2149d940a145c9cf3403cdc2c09da563): [comparison URL](https://perf.rust-lang.org/compare.html?start=ee447067e18f07aa6ee67dcf0ddc7b07eb675672&end=ebcec0ca2149d940a145c9cf3403cdc2c09da563&stat=instructions:u). ### Overall result: ❌ regressions - please read the text below Benchmarking this pull request means it may be perf-sensitive – we'll automatically label...

Set mmapped files as readonly to prevent other processes from modifying it by accident

Awaiting bors try build completion. @rustbot label: +S-waiting-on-perf

Set mmapped files as readonly to prevent other processes from modifying it by accident

Awaiting bors try build completion. @rustbot label: +S-waiting-on-perf