8000 Apply #[must_use] lint to components of tuples by varkor · Pull Request #61100 · rust-lang/rust · GitHub
[go: up one dir, main page]
Skip to content

Apply #[must_use] lint to components of tuples #61100

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 7 commits into from
Jun 3, 2019
Merged

Apply #[must_use] lint to components of tuples #61100

Changes from 1 commit
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
bbac81a
Warn for #[must_use] in tuples
varkor May 23, 2019
fd36b5f
Add test for #[must_use] in tuples
varkor May 23, 2019
e121d96
Use precise span for must_use tuple components
varkor May 27, 2019
3c768ad
Fix issue with recursively encountering uninhabited type
varkor May 27, 2019
058551c
Add function call to test
varkor May 27, 2019
81fa794
Specify tuple element in lint message
varkor May 28, 2019
de2bf3a
Add nested must_use variant
varkor Jun 3, 2019
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
Prev Previous commit
Next Next commit
Fix issue with recursively encountering uninhabited type
  • Loading branch information
@varkor
varkor committed Jun 3, 2019
commit 3c768ade4d7c18db873c201a8aebda0f9c243a30
21 changes: 10 additions & 11 deletions src/librustc_lint/unused.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -48,14 +48,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnusedResults {
}

let ty = cx.tables.expr_ty(&expr);
let type_permits_lack_of_use = if ty.is_unit()
|| cx.tcx.is_ty_uninhabited_from(
cx.tcx.hir().get_module_parent_by_hir_id(expr.hir_id), ty)
{
true
} else {
check_must_use_ty(cx, ty, &expr, s.span)
};
let type_permits_lack_of_use = check_must_use_ty(cx, ty, &expr, s.span);

let mut fn_warned = false;
let mut op_warned = false;
Expand Down Expand Up @@ -135,12 +128,18 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnusedResults {
}

// Returns whether an error has been emitted (and thus another does not need to be later).
fn check_must_use_ty(
cx: &LateContext<'_, '_>,
ty: Ty<'_>,
fn check_must_use_ty<'tcx>(
cx: &LateContext<'_, 'tcx>,
ty: Ty<'tcx>,
expr: &hir::Expr,
span: Span,
) -> bool {
if ty.is_unit() || cx.tcx.is_ty_uninhabited_from(
cx.tcx.hir().get_module_parent_by_hir_id(expr.hir_id), ty)
{
return true;
}

match ty.sty {
ty::Adt(def, _) => check_must_use_def(cx, def.did, span, "", ""),
ty::Opaque(def, _) => {
Expand Down
0