Rollup of 5 pull requests

compiler/rustc_ast_lowering/src/path.rs

@@ -34,7 +34,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         modifiers: Option<ast::TraitBoundModifiers>,
     ) -> hir::QPath<'hir> {
         let qself_position = qself.as_ref().map(|q| q.position);
-        let qself = qself.as_ref().map(|q| self.lower_ty(&q.ty, itctx));
+        let qself = qself
+            .as_ref()
+            // Reject cases like `<impl Trait>::Assoc` and `<impl Trait as Trait>::Assoc`.
+            .map(|q| self.lower_ty(&q.ty, ImplTraitContext::Disallowed(ImplTraitPosition::Path)));
 
         let partial_res =
             self.resolver.get_partial_res(id).unwrap_or_else(|| PartialRes::new(Res::Err));
@@ -75,6 +78,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             None
         };
 
+        // Only permit `impl Trait` in the final segment. E.g., we permit `Option<impl Trait>`,
+        // `option::Option<T>::Xyz<impl Trait>` and reject `option::Option<impl Trait>::Xyz`.
+        let itctx = |i| {
+            if i + 1 == p.segments.len() {
+                itctx
+            } else {
+                ImplTraitContext::Disallowed(ImplTraitPosition::Path)
+            }
+        };
+
         let path_span_lo = p.span.shrink_to_lo();
         let proj_start = p.segments.len() - unresolved_segments;
         let path = self.arena.alloc(hir::Path {
@@ -121,7 +134,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         segment,
                         param_mode,
                         generic_args_mode,
-                        itctx,
+                        itctx(i),
                         bound_modifier_allowed_features.clone(),
                     )
                 },
@@ -185,7 +198,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 segment,
                 param_mode,
                 generic_args_mode,
-                itctx,
+                itctx(i),
                 None,
             ));
             let qpath = hir::QPath::TypeRelative(ty, hir_segment);

compiler/rustc_ast_passes/messages.ftl

@@ -146,8 +146,6 @@ ast_passes_generic_before_constraints = generic arguments must come before the f
 
 ast_passes_generic_default_trailing = generic parameters with a default must be trailing
 
-ast_passes_impl_trait_path = `impl Trait` is not allowed in path parameters
-
 ast_passes_incompatible_features = `{$f1}` and `{$f2}` are incompatible, using them at the same time is not allowed
     .help = remove one of these features
 

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -80,10 +80,6 @@ struct AstValidator<'a> {
 
     disallow_tilde_const: Option<TildeConstReason>,
 
-    /// Used to ban `impl Trait` in path projections like `<impl Iterator>::Item`
-    /// or `Foo::Bar<impl Trait>`
-    is_impl_trait_banned: bool,
-
     /// Used to ban explicit safety on foreign items when the extern block is not marked as unsafe.
     extern_mod_safety: Option<Safety>,
 
@@ -123,12 +119,6 @@ impl<'a> AstValidator<'a> {
         self.extern_mod_safety = old;
     }
 
-    fn with_banned_impl_trait(&mut self, f: impl FnOnce(&mut Self)) {
-        let old = mem::replace(&mut self.is_impl_trait_banned, true);
-        f(self);
-        self.is_impl_trait_banned = old;
-    }
-
     fn with_tilde_const(
         &mut self,
         disallowed: Option<TildeConstReason>,
@@ -213,37 +203,6 @@ impl<'a> AstValidator<'a> {
                 .with_tilde_const(Some(TildeConstReason::TraitObject), |this| {
                     visit::walk_ty(this, t)
                 }),
-            TyKind::Path(qself, path) => {
-                // We allow these:
-                //  - `Option<impl Trait>`
-                //  - `option::Option<impl Trait>`
-                //  - `option::Option<T>::Foo<impl Trait>`
-                //
-                // But not these:
-                //  - `<impl Trait>::Foo`
-                //  - `option::Option<impl Trait>::Foo`.
-                //
-                // To implement this, we disallow `impl Trait` from `qself`
-                // (for cases like `<impl Trait>::Foo>`)
-                // but we allow `impl Trait` in `GenericArgs`
-                // iff there are no more PathSegments.
-                if let Some(qself) = qself {
-                    // `impl Trait` in `qself` is always illegal
-                    self.with_banned_impl_trait(|this| this.visit_ty(&qself.ty));
-                }
-
-                // Note that there should be a call to visit_path here,
-                // so if any logic is added to process `Path`s a call to it should be
-                // added both in visit_path and here. This code mirrors visit::walk_path.
-                for (i, segment) in path.segments.iter().enumerate() {
-                    // Allow `impl Trait` iff we're on the final path segment
-                    if i == path.segments.len() - 1 {
-                        self.visit_path_segment(segment);
-                    } else {
-                        self.with_banned_impl_trait(|this| this.visit_path_segment(segment));
-                    }
-                }
-            }
             _ => visit::walk_ty(self, t),
         }
     }
@@ -737,10 +696,6 @@ impl<'a> AstValidator<'a> {
                 }
             }
             TyKind::ImplTrait(_, bounds) => {
-                if self.is_impl_trait_banned {
-                    self.dcx().emit_err(errors::ImplTraitPath { span: ty.span });
-                }
-
                 if let Some(outer_impl_trait_sp) = self.outer_impl_trait {
                     self.dcx().emit_err(errors::NestedImplTrait {
                         span: ty.span,
@@ -1729,7 +1684,6 @@ pub fn check_crate(
         has_proc_macro_decls: false,
         outer_impl_trait: None,
         disallow_tilde_const: Some(TildeConstReason::Item),
-        is_impl_trait_banned: false,
         extern_mod_safety: None,
         lint_buffer: lints,
     };

compiler/rustc_ast_passes/src/errors.rs

@@ -418,13 +418,6 @@ pub(crate) struct TraitObjectBound {
     pub span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(ast_passes_impl_trait_path, code = E0667)]
-pub(crate) struct ImplTraitPath {
-    #[primary_span]
-    pub span: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(ast_passes_nested_impl_trait, code = E0666)]
 pub(crate) struct NestedImplTrait {

compiler/rustc_error_codes/src/error_codes/E0667.md

@@ -1,8 +1,10 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 `impl Trait` is not allowed in path parameters.
 
 Erroneous code example:
 
-```compile_fail,E0667
+```ignore (removed error code)
 fn some_fn(mut x: impl Iterator) -> <impl Iterator>::Item { // error!
     x.next().unwrap()
 }
@@ -11,7 +13,7 @@ fn some_fn(mut x: impl Iterator) -> <impl Iterator>::Item { // error!
 You cannot use `impl Trait` in path parameters. If you want something
 equivalent, you can do this instead:
 
-```
+```ignore (removed error code)
 fn some_fn<T: Iterator>(mut x: T) -> T::Item { // ok!
     x.next().unwrap()
 }