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extra_unused_type_parameters:

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* Inline `is_empty_exported_or_macro`.
* Check if there are any generic parameters before walking the signature.
This commit is contained in:
Jason Newcomb 2024-06-11 02:03:09 -04:00
parent f178316ae2
commit d409b5c700
1 changed files with 13 additions and 17 deletions
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30
clippy_lints/src/extra_unused_type_parameters.rs
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@ -50,21 +50,6 @@ impl ExtraUnusedTypeParameters {
avoid_breaking_exported_api,
}
}
/// Don't lint external macros or functions with empty bodies. Also, don't lint exported items
/// if the `avoid_breaking_exported_api` config option is set.
fn is_empty_exported_or_macro(
&self,
cx: &LateContext<'_>,
span: Span,
def_id: LocalDefId,
body_id: BodyId,
) -> bool {
let body = cx.tcx.hir().body(body_id).value;
let fn_empty = matches!(&body.kind, ExprKind::Block(blk, None) if blk.stmts.is_empty() && blk.expr.is_none());
let is_exported = cx.effective_visibilities.is_exported(def_id);
in_external_macro(cx.sess(), span) || fn_empty || (is_exported && self.avoid_breaking_exported_api)
}
}
impl_lint_pass!(ExtraUnusedTypeParameters => [EXTRA_UNUSED_TYPE_PARAMETERS]);
@ -266,10 +251,17 @@ impl<'cx, 'tcx> Visitor<'tcx> for TypeWalker<'cx, 'tcx> {
}
}
fn is_empty_body(cx: &LateContext<'_>, body: BodyId) -> bool {
matches!(cx.tcx.hir().body(body).value.kind, ExprKind::Block(b, _) if b.stmts.is_empty() && b.expr.is_none())
}
impl<'tcx> LateLintPass<'tcx> for ExtraUnusedTypeParameters {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
if let ItemKind::Fn(_, generics, body_id) = item.kind
&& !self.is_empty_exported_or_macro(cx, item.span, item.owner_id.def_id, body_id)
&& !generics.params.is_empty()
&& !is_empty_body(cx, body_id)
&& (!self.avoid_breaking_exported_api || !cx.effective_visibilities.is_exported(item.owner_id.def_id))
&& !in_external_macro(cx.sess(), item.span)
&& !is_from_proc_macro(cx, item)
{
let mut walker = TypeWalker::new(cx, generics);
@ -281,8 +273,12 @@ impl<'tcx> LateLintPass<'tcx> for ExtraUnusedTypeParameters {
fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'tcx>) {
// Only lint on inherent methods, not trait methods.
if let ImplItemKind::Fn(.., body_id) = item.kind
&& !item.generics.params.is_empty()
&& trait_ref_of_method(cx, item.owner_id.def_id).is_none()
&& !self.is_empty_exported_or_macro(cx, item.span, item.owner_id.def_id, body_id)
&& !is_empty_body(cx, body_id)
&& (!self.avoid_breaking_exported_api || !cx.effective_visibilities.is_exported(item.owner_id.def_id))
&& !in_external_macro(cx.sess(), item.span)
&& !is_from_proc_macro(cx, item)
{
let mut walker = TypeWalker::new(cx, item.generics);
walk_impl_item(&mut walker, item);