338647db73
expand: Do not allocate `Lrc` for `allow_internal_unstable` list unless necessary This allocation is done for any macro defined in the current crate, or used from a different crate. EDIT: This also removes an `Lrc` increment from each *use* of such macro, which may be more significant. Noticed when reviewing https://github.com/rust-lang/rust/pull/82367. This probably doesn't matter, but let's do a perf run. |
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Cargo.toml |