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Rollup merge of #136816 - yotamofek:pr/notable-traits-button-cleanup, r=aDotInTheVoid

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refactor `notable_traits_button` to use iterator combinators  instead of for loop

~Small cleanup.
Use `Iterator::any` instead of `for` loop with `predicate = true;`.
I think this makes the code more readable... and also has the additional benefit of short-circuiting the iterator when a notable trait is found (a `break` statement was missing in the `for` loop version, I think). Probably won't be significant enough to show on perf results, though.~

Three commits, each attempting to optimize `notable_trait_buttons` by a little bit.
This commit is contained in:
Jacob Pratt 2025-03-16 21:47:43 -04:00 • committed by GitHub
commit 04032ab233
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1 changed files with 11 additions and 21 deletions
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32
src/librustdoc/html/render/mod.rs
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@ -1465,8 +1465,6 @@ pub(crate) fn notable_traits_button(
ty: &clean::Type,
cx: &Context<'_>,
) -> Option<impl fmt::Display> {
let mut has_notable_trait = false;
if ty.is_unit() {
// Very common fast path.
return None;
@ -1484,27 +1482,19 @@ pub(crate) fn notable_traits_button(
return None;
}
if let Some(impls) = cx.cache().impls.get(&did) {
for i in impls {
let impl_ = i.inner_impl();
if impl_.polarity != ty::ImplPolarity::Positive {
continue;
}
if !ty.is_doc_subtype_of(&impl_.for_, cx.cache()) {
let impls = cx.cache().impls.get(&did)?;
let has_notable_trait = impls
.iter()
.map(Impl::inner_impl)
.filter(|impl_| {
impl_.polarity == ty::ImplPolarity::Positive
// Two different types might have the same did,
// without actually being the same.
continue;
}
if let Some(trait_) = &impl_.trait_ {
let trait_did = trait_.def_id();
if cx.cache().traits.get(&trait_did).is_some_and(|t| t.is_notable_trait(cx.tcx())) {
has_notable_trait = true;
}
}
}
}
&& ty.is_doc_subtype_of(&impl_.for_, cx.cache())
})
.filter_map(|impl_| impl_.trait_.as_ref())
.filter_map(|trait_| cx.cache().traits.get(&trait_.def_id()))
.any(|t| t.is_notable_trait(cx.tcx()));
has_notable_trait.then(|| {
cx.types_with_notable_traits.borrow_mut().insert(ty.clone());