Skip to content

Mini-fix double_must_use for async functions #10589

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Apr 4, 2023
Merged

Mini-fix double_must_use for async functions #10589

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
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
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 4 additions & 3 deletions clippy_lints/src/functions/must_use.rs
View file
Open in desktop
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) */ {
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Does this affect must_use_unit? If so, it would seem to me that it should be limited to double_must_use only.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Fixed in the last commit.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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());

Expand Down
6 changes: 6 additions & 0 deletions tests/ui/double_must_use.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
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