diff --git a/src/librustc_resolve/late.rs b/src/librustc_resolve/late.rs index ed88e54969215..261c2031364f6 100644 --- a/src/librustc_resolve/late.rs +++ b/src/librustc_resolve/late.rs @@ -1500,11 +1500,17 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> { pat_src: PatternSource, bindings: &mut SmallVec<[(PatBoundCtx, FxHashSet); 1]>, ) { + let is_tuple_struct_pat = matches!(pat.kind, PatKind::TupleStruct(_, _)); + // Visit all direct subpatterns of this pattern. pat.walk(&mut |pat| { debug!("resolve_pattern pat={:?} node={:?}", pat, pat.kind); match pat.kind { - PatKind::Ident(bmode, ident, ref sub) => { + // In tuple struct patterns ignore the invalid `ident @ ...`. + // It will be handled as an error by the AST lowering. + PatKind::Ident(bmode, ident, ref sub) + if !(is_tuple_struct_pat && sub.as_ref().filter(|p| p.is_rest()).is_some()) => + { // First try to resolve the identifier as some existing entity, // then fall back to a fresh binding. let has_sub = sub.is_some(); diff --git a/src/test/ui/issues/issue-74539.rs b/src/test/ui/issues/issue-74539.rs new file mode 100644 index 0000000000000..75632d11c1df0 --- /dev/null +++ b/src/test/ui/issues/issue-74539.rs @@ -0,0 +1,12 @@ +enum E { + A(u8, u8), +} + +fn main() { + let e = E::A(2, 3); + match e { + E::A(x @ ..) => { //~ ERROR `x @` is not allowed in a tuple + x //~ ERROR cannot find value `x` in this scope + } + }; +} diff --git a/src/test/ui/issues/issue-74539.stderr b/src/test/ui/issues/issue-74539.stderr new file mode 100644 index 0000000000000..94526dcd7cb39 --- /dev/null +++ b/src/test/ui/issues/issue-74539.stderr @@ -0,0 +1,21 @@ +error[E0425]: cannot find value `x` in this scope + --> $DIR/issue-74539.rs:9:13 + | +LL | x + | ^ help: a local variable with a similar name exists: `e` + +error: `x @` is not allowed in a tuple struct + --> $DIR/issue-74539.rs:8:14 + | +LL | E::A(x @ ..) => { + | ^^^^^^ this is only allowed in slice patterns + | + = help: remove this and bind each tuple field independently +help: if you don't need to use the contents of x, discard the tuple's remaining fields + | +LL | E::A(..) => { + | ^^ + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0425`.