Revert "Fix an ICE on an invalid binding @ ... in a tuple struct pattern"

This reverts commit f5e5eb6f46.

src/librustc_resolve/late.rs

@@ -1510,20 +1510,11 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         pat_src: PatternSource,
         bindings: &mut SmallVec<[(PatBoundCtx, FxHashSet<Ident>); 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) => {
-                    if is_tuple_struct_pat && sub.as_ref().filter(|p| p.is_rest()).is_some() {
-                        // In tuple struct patterns ignore the invalid `ident @ ...`.
-                        // It will be handled as an error by the AST lowering.
-                        self.r
-                            .session
-                            .delay_span_bug(ident.span, "ident in tuple pattern is invalid");
-                    } else {
                     // First try to resolve the identifier as some existing entity,
                     // then fall back to a fresh binding.
                     let has_sub = sub.is_some();
@@ -1534,7 +1525,6 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
                         });
                     self.r.record_partial_res(pat.id, PartialRes::new(res));
                 }
-                }
                 PatKind::TupleStruct(ref path, ..) => {
                     self.smart_resolve_path(pat.id, None, path, PathSource::TupleStruct(pat.span));
                 }

src/test/ui/issues/issue-74539.rs

@@ -1,12 +0,0 @@
-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
-        }
-    };
-}

src/test/ui/issues/issue-74539.stderr

@@ -1,21 +0,0 @@
-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`.