diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs index 668c159f3cc..cfc91d636a7 100644 --- a/compiler/rustc_passes/src/dead.rs +++ b/compiler/rustc_passes/src/dead.rs @@ -395,6 +395,9 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> { self.mark_as_used_if_union(*adt, fields); } } + hir::ExprKind::Closure(cls) => { + self.insert_def_id(cls.def_id.to_def_id()); + } _ => (), } diff --git a/tests/ui/lint/dead-code/in-closure.rs b/tests/ui/lint/dead-code/in-closure.rs new file mode 100644 index 00000000000..c55634405ed --- /dev/null +++ b/tests/ui/lint/dead-code/in-closure.rs @@ -0,0 +1,16 @@ +// edition: 2021 + +#![deny(dead_code)] + +pub fn foo() { + let closure = || { + fn a() {} //~ ERROR function `a` is never used + }; + closure() +} + +pub async fn async_foo() { + const A: usize = 1; //~ ERROR constant `A` is never used +} + +fn main() {} diff --git a/tests/ui/lint/dead-code/in-closure.stderr b/tests/ui/lint/dead-code/in-closure.stderr new file mode 100644 index 00000000000..deb276be702 --- /dev/null +++ b/tests/ui/lint/dead-code/in-closure.stderr @@ -0,0 +1,20 @@ +error: function `a` is never used + --> $DIR/in-closure.rs:7:12 + | +LL | fn a() {} + | ^ + | +note: the lint level is defined here + --> $DIR/in-closure.rs:3:9 + | +LL | #![deny(dead_code)] + | ^^^^^^^^^ + +error: constant `A` is never used + --> $DIR/in-closure.rs:13:11 + | +LL | const A: usize = 1; + | ^ + +error: aborting due to 2 previous errors +