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Auto merge of #117727 - saethlin:inline-derived-fmt, r=nnethercote

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Emit #[inline] on derive(Debug)

While working on https://github.com/rust-lang/rust/pull/116583 I noticed that the `cross_crate_inlinable` query identifies a lot of derived `Debug` impls as a MIR body that's little more than a call, which suggests they may be a good candidate for `#[inline]`. So here I've implemented that change specifically.

It seems to provide a nice improvement to build times.
This commit is contained in:
bors 2023-11-09 21:34:14 +00:00
commit 0f44eb32f1
3 changed files with 23 additions and 3 deletions
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2
compiler/rustc_builtin_macros/src/deriving/debug.rs
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@ -33,7 +33,7 @@ pub fn expand_deriving_debug(
explicit_self: true,
nonself_args: vec![(fmtr, sym::f)],
ret_ty: Path(path_std!(fmt::Result)),
attributes: ast::AttrVec::new(),
attributes: thin_vec![cx.attr_word(sym::inline, span)],
fieldless_variants_strategy:
FieldlessVariantsStrategy::SpecializeIfAllVariantsFieldless,
combine_substructure: combine_substructure(Box::new(|a, b, c| {