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Mini-fix double_must_use for async functions #10589

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merged 3 commits into from
Apr 4, 2023
Merged

Mini-fix double_must_use for async functions #10589

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e2742a0
Fix `double_must_use` for async functions
blyxyas Apr 2, 2023
d602743
only focus on `double_must_use` + Add `Result<(), ()>` test
blyxyas Apr 3, 2023
a37eb4d
Fix false negative on `Result<(), ()>`
blyxyas Apr 3, 2023
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7 changes: 4 additions & 3 deletions clippy_lints/src/functions/must_use.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,8 @@ use super::{DOUBLE_MUST_USE, MUST_USE_CANDIDATE, MUST_USE_UNIT};
pub(super) fn check_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
let attrs = cx.tcx.hir().attrs(item.hir_id());
let attr = cx.tcx.get_attr(item.owner_id, sym::must_use);
if let hir::ItemKind::Fn(ref sig, _generics, ref body_id) = item.kind {
if let hir::ItemKind::Fn(ref sig, _generics, ref body_id) = item.kind && !sig.header.is_async() /* (#10486) */ {

let is_public = cx.effective_visibilities.is_exported(item.owner_id.def_id);
let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
if let Some(attr) = attr {
Expand All @@ -43,7 +44,7 @@ pub(super) fn check_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>
}

pub(super) fn check_impl_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
if let hir::ImplItemKind::Fn(ref sig, ref body_id) = item.kind {
if let hir::ImplItemKind::Fn(ref sig, ref body_id) = item.kind && !sig.header.is_async() /* (#10486) */ {
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Does this affect must_use_unit? If so, it would seem to me that it should be limited to double_must_use only.

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Fixed in the last commit.

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Thanks! I made one comment.

let is_public = cx.effective_visibilities.is_exported(item.owner_id.def_id);
let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
let attrs = cx.tcx.hir().attrs(item.hir_id());
Expand All @@ -65,7 +66,7 @@ pub(super) fn check_impl_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::Imp
}

pub(super) fn check_trait_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
if let hir::TraitItemKind::Fn(ref sig, ref eid) = item.kind {
if let hir::TraitItemKind::Fn(ref sig, ref eid) = item.kind && !sig.header.is_async() /* (#10486) */ {
let is_public = cx.effective_visibilities.is_exported(item.owner_id.def_id);
let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());

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6 changes: 6 additions & 0 deletions tests/ui/double_must_use.rs
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Expand Up @@ -21,6 +21,12 @@ pub fn must_use_with_note() -> Result<(), ()> {
unimplemented!();
}

// vvvv Should not lint (#10486)
#[must_use]
async fn async_must_use() -> usize {
unimplemented!();
}

fn main() {
must_use_result();
must_use_tuple();
Expand Down