bjoernager/rust
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Remove MatcherPosHandle.

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This type was a small performance win for `html5ever`, which uses a
macro with hundreds of very simple rules that don't contain any
metavariables. But this type is complicated (extra lifetimes) and
perf-neutral for macros that do have metavariables.

This commit removes `MatcherPosHandle`, simplifying things a lot. This
increases the allocation rate for `html5ever` and similar cases a bit,
but makes things easier for follow-up changes that will improve
performance more than what we lost here.
This commit is contained in:
Nicholas Nethercote 2022-03-19 08:56:24 +11:00
parent 10644e0789
commit cedb787f6e
2 changed files with 23 additions and 88 deletions
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compiler/rustc_expand/src/lib.rs
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@ -1,5 +1,6 @@
#![feature(associated_type_bounds)]
#![feature(associated_type_defaults)]
#![feature(box_syntax)]
#![feature(crate_visibility_modifier)]
#![feature(decl_macro)]
#![feature(if_let_guard)]