remove support for typeof

compiler/rustc_ast/src/ast.rs

@@ -2488,8 +2488,6 @@ pub enum TyKind {
     ImplTrait(NodeId, #[visitable(extra = BoundKind::Impl)] GenericBounds),
     /// No-op; kept solely so that we can pretty-print faithfully.
     Paren(Box<Ty>),
-    /// Unused for now.
-    Typeof(AnonConst),
     /// This means the type should be inferred instead of it having been
     /// specified. This can appear anywhere in a type.
     Infer,

compiler/rustc_ast/src/token.rs

@@ -321,7 +321,7 @@ fn ident_can_begin_type(name: Symbol, span: Span, is_raw: IdentIsRaw) -> bool {
 
     !ident_token.is_reserved_ident()
         || ident_token.is_path_segment_keyword()
-        || [kw::Underscore, kw::For, kw::Impl, kw::Fn, kw::Unsafe, kw::Extern, kw::Typeof, kw::Dyn]
+        || [kw::Underscore, kw::For, kw::Impl, kw::Fn, kw::Unsafe, kw::Extern, kw::Dyn]
             .contains(&name)
 }
 

compiler/rustc_ast/src/util/classify.rs

@@ -294,7 +294,6 @@ fn type_trailing_braced_mac_call(mut ty: &ast::Ty) -> Option<&ast::MacCall> {
             | ast::TyKind::Never
             | ast::TyKind::Tup(..)
             | ast::TyKind::Paren(..)
-            | ast::TyKind::Typeof(..)
             | ast::TyKind::Infer
             | ast::TyKind::ImplicitSelf
             | ast::TyKind::CVarArgs

compiler/rustc_ast_lowering/src/lib.rs

@@ -1361,7 +1361,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 self.lower_ty(ty, itctx),
                 self.lower_array_length_to_const_arg(length),
             ),
-            TyKind::Typeof(expr) => hir::TyKind::Typeof(self.lower_anon_const_to_anon_const(expr)),
             TyKind::TraitObject(bounds, kind) => {
                 let mut lifetime_bound = None;
                 let (bounds, lifetime_bound) = self.with_dyn_type_scope(true, |this| {

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -1325,11 +1325,6 @@ impl<'a> State<'a> {
                 self.print_expr(&length.value, FixupContext::default());
                 self.word("]");
             }
-            ast::TyKind::Typeof(e) => {
-                self.word("typeof(");
-                self.print_expr(&e.value, FixupContext::default());
-                self.word(")");
-            }
             ast::TyKind::Infer => {
                 self.word("_");
             }

compiler/rustc_error_codes/src/error_codes/E0516.md

@@ -1,3 +1,5 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 The `typeof` keyword is currently reserved but unimplemented.
 
 Erroneous code example:

compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs

@@ -195,10 +195,11 @@ impl<'tcx> InherentCollect<'tcx> {
             | ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
-            | ty::CoroutineWitness(..) => {
-                Err(self.tcx.dcx().delayed_bug("cannot define inherent `impl` for closure types"))
-            }
-            ty::Alias(ty::Free, _) | ty::Bound(..) | ty::Placeholder(_) | ty::Infer(_) => {
+            | ty::CoroutineWitness(..)
+            | ty::Alias(ty::Free, _)
+            | ty::Bound(..)
+            | ty::Placeholder(_)
+            | ty::Infer(_) => {
                 bug!("unexpected impl self type of impl: {:?} {:?}", id, self_ty);
             }
             // We could bail out here, but that will silence other useful errors.

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -217,21 +217,19 @@ pub(crate) fn orphan_check_impl(
             | ty::Slice(..)
             | ty::RawPtr(..)
             | ty::Ref(..)
-            | ty::FnDef(..)
             | ty::FnPtr(..)
             | ty::Never
             | ty::Tuple(..)
             | ty::UnsafeBinder(_) => (LocalImpl::Allow, NonlocalImpl::DisallowOther),
 
-            ty::Closure(..)
+            ty::FnDef(..)
+            | ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
-            | ty::CoroutineWitness(..) => {
-                return Err(tcx
-                    .dcx()
-                    .delayed_bug("cannot define inherent `impl` for closure types"));
-            }
-            ty::Bound(..) | ty::Placeholder(..) | ty::Infer(..) => {
+            | ty::CoroutineWitness(..)
+            | ty::Bound(..)
+            | ty::Placeholder(..)
+            | ty::Infer(..) => {
                 let sp = tcx.def_span(impl_def_id);
                 span_bug!(sp, "weird self type for autotrait impl")
             }

compiler/rustc_lint/src/unused.rs

@@ -1644,18 +1644,6 @@ impl EarlyLintPass for UnusedBraces {
                 );
             }
 
-            ast::TyKind::Typeof(ref anon_const) => {
-                self.check_unused_delims_expr(
-                    cx,
-                    &anon_const.value,
-                    UnusedDelimsCtx::AnonConst,
-                    false,
-                    None,
-                    None,
-                    false,
-                );
-            }
-
             _ => {}
         }
     }

compiler/rustc_next_trait_solver/src/coherence.rs

@@ -336,7 +336,6 @@ where
             | ty::Uint(..)
             | ty::Float(..)
             | ty::Str
-            | ty::FnDef(..)
             | ty::Pat(..)
             | ty::FnPtr(..)
             | ty::Array(..)
@@ -403,7 +402,6 @@ where
                     // implement, so we don't use this behavior.
                     // Addendum: Moreover, revealing the underlying type is likely to cause cycle
                     // errors as we rely on coherence / the specialization graph during typeck.
-
                     self.found_non_local_ty(ty)
                 }
             }
@@ -435,31 +433,14 @@ where
                 }
             }
             ty::Error(_) => ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty)),
-            ty::Closure(did, ..) => {
-                if self.def_id_is_local(did) {
-                    ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty))
-                } else {
-                    self.found_non_local_ty(ty)
-                }
-            }
-            ty::CoroutineClosure(did, ..) => {
-                if self.def_id_is_local(did) {
-                    ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty))
-                } else {
-                    self.found_non_local_ty(ty)
-                }
-            }
-            ty::Coroutine(did, ..) => {
-                if self.def_id_is_local(did) {
-                    ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty))
-                } else {
-                    self.found_non_local_ty(ty)
-                }
+
+            ty::FnDef(..)
+            | ty::Closure(..)
+            | ty::CoroutineClosure(..)
+            | ty::Coroutine(..)
+            | ty::CoroutineWitness(..) => {
+                unreachable!("unnameable type in coherence: {ty:?}");
             }
-            // This should only be created when checking whether we have to check whether some
-            // auto trait impl applies. There will never be multiple impls, so we can just
-            // act as if it were a local type here.
-            ty::CoroutineWitness(..) => ControlFlow::Break(OrphanCheckEarlyExit::LocalTy(ty)),
         };
         // A bit of a hack, the `OrphanChecker` is only used to visit a `TraitRef`, so
         // the first type we visit is always the self type.

compiler/rustc_parse/src/parser/ty.rs

@@ -328,8 +328,6 @@ impl<'a> Parser<'a> {
             // Reference
             self.expect_and()?;
             self.parse_borrowed_pointee()?
-        } else if self.eat_keyword_noexpect(kw::Typeof) {
-            self.parse_typeof_ty()?
         } else if self.eat_keyword(exp!(Underscore)) {
             // A type to be inferred `_`
             TyKind::Infer
@@ -763,15 +761,6 @@ impl<'a> Parser<'a> {
         }
     }
 
-    // Parses the `typeof(EXPR)`.
-    // To avoid ambiguity, the type is surrounded by parentheses.
-    fn parse_typeof_ty(&mut self) -> PResult<'a, TyKind> {
-        self.expect(exp!(OpenParen))?;
-        let expr = self.parse_expr_anon_const()?;
-        self.expect(exp!(CloseParen))?;
-        Ok(TyKind::Typeof(expr))
-    }
-
     /// Parses a function pointer type (`TyKind::FnPtr`).
     /// ```ignore (illustrative)
     ///    [unsafe] [extern "ABI"] fn (S) -> T

compiler/rustc_passes/src/input_stats.rs

@@ -683,7 +683,6 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
                 TraitObject,
                 ImplTrait,
                 Paren,
-                Typeof,
                 Infer,
                 ImplicitSelf,
                 MacCall,

compiler/rustc_resolve/src/late.rs

@@ -944,9 +944,6 @@ impl<'ast, 'ra, 'tcx> Visitor<'ast> for LateResolutionVisitor<'_, 'ast, 'ra, 'tc
                 self.visit_ty(element_ty);
                 self.resolve_anon_const(length, AnonConstKind::ConstArg(IsRepeatExpr::No));
             }
-            TyKind::Typeof(ct) => {
-                self.resolve_anon_const(ct, AnonConstKind::ConstArg(IsRepeatExpr::No))
-            }
             _ => visit::walk_ty(self, ty),
         }
         self.diag_metadata.current_trait_object = prev;

src/tools/tidy/src/issues.txt

@@ -2983,9 +2983,6 @@ ui/typeck/issue-96530.rs
 ui/typeck/issue-96738.rs
 ui/typeck/issue-98260.rs
 ui/typeck/issue-98982.rs
-ui/typeof/issue-100183.rs
-ui/typeof/issue-29184.rs
-ui/typeof/issue-42060.rs
 ui/unboxed-closures/issue-18652.rs
 ui/unboxed-closures/issue-18661.rs
 ui/unboxed-closures/issue-30906.rs