Auto merge of rust-lang#104418 - matthiaskrgr:rollup-y4i6xjc, r=matth…

…iaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#101967 (Move `unix_socket_abstract` feature API to `SocketAddrExt`.)
 - rust-lang#102470 (Stabilize const char convert)
 - rust-lang#104223 (Recover from function pointer types with generic parameter list)
 - rust-lang#104229 (Don't print full paths in overlap errors)
 - rust-lang#104294 (Don't ICE with inline const errors during MIR build)
 - rust-lang#104332 (Fixed some `_i32` notation in `maybe_uninit`’s doc)
 - rust-lang#104349 (fix some typos in comments)
 - rust-lang#104350 (Fix x finding Python on Windows)
 - rust-lang#104356 (interpret: make check_mplace public)
 - rust-lang#104364 (rustdoc: Resolve doc links in external traits having local impls)
 - rust-lang#104378 (Bump chalk to v0.87)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Cargo.lock

@@ -502,9 +502,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-derive"
-version = "0.80.0"
+version = "0.87.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0001adf0cf12361e08b65e1898ea138f8f77d8f5177cbf29b6b3b3532252bd6"
+checksum = "d552b2fa341f5fc35c6b917b1d289d3c3a34d0b74e579390ea6192d6152a8cdb"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -514,9 +514,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-engine"
-version = "0.80.0"
+version = "0.87.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c44ee96f2d67cb5193d1503f185db1abad9933a1c6e6b4169c176f90baecd393"
+checksum = "7e54ac43048cb31c470d7b3e3acd409090ef4a5abddfe02455187aebc3d6879f"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -527,9 +527,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-ir"
-version = "0.80.0"
+version = "0.87.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92d8a95548f23618fda86426e4304e563ec2bb7ba0216139f0748d63c107b5f1"
+checksum = "43aa55deff4e7fbdb09fa014543372f2c95a06835ac487b9ce57b5099b950838"
 dependencies = [
  "bitflags",
  "chalk-derive",
@@ -538,9 +538,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-solve"
-version = "0.80.0"
+version = "0.87.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f37f492dacfafe2e21319b80827da2779932909bb392f0cc86b2bd5c07c1b4e1"
+checksum = "61213deefc36ba265ad01c4d997e18bcddf7922862a4594a47ca4575afb3dab4"
 dependencies = [
  "chalk-derive",
  "chalk-ir",

compiler/rustc_const_eval/src/interpret/operand.rs

@@ -376,7 +376,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
     /// Read an immediate from a place, asserting that that is possible with the given layout.
     ///
-    /// If this suceeds, the `ImmTy` is never `Uninit`.
+    /// If this succeeds, the `ImmTy` is never `Uninit`.
     #[inline(always)]
     pub fn read_immediate(
         &self,

compiler/rustc_const_eval/src/interpret/place.rs

@@ -316,8 +316,7 @@ where
         Ok(MPlaceTy { mplace, layout, align })
     }
 
-    /// Take an operand, representing a pointer, and dereference it to a place -- that
-    /// will always be a MemPlace.  Lives in `place.rs` because it creates a place.
+    /// Take an operand, representing a pointer, and dereference it to a place.
     #[instrument(skip(self), level = "debug")]
     pub fn deref_operand(
         &self,
@@ -331,7 +330,7 @@ where
         }
 
         let mplace = self.ref_to_mplace(&val)?;
-        self.check_mplace_access(mplace, CheckInAllocMsg::DerefTest)?;
+        self.check_mplace(mplace)?;
         Ok(mplace)
     }
 
@@ -358,17 +357,18 @@ where
     }
 
     /// Check if this mplace is dereferenceable and sufficiently aligned.
-    fn check_mplace_access(
-        &self,
-        mplace: MPlaceTy<'tcx, M::Provenance>,
-        msg: CheckInAllocMsg,
-    ) -> InterpResult<'tcx> {
+    pub fn check_mplace(&self, mplace: MPlaceTy<'tcx, M::Provenance>) -> InterpResult<'tcx> {
         let (size, align) = self
             .size_and_align_of_mplace(&mplace)?
             .unwrap_or((mplace.layout.size, mplace.layout.align.abi));
         assert!(mplace.align <= align, "dynamic alignment less strict than static one?");
         let align = M::enforce_alignment(self).then_some(align);
-        self.check_ptr_access_align(mplace.ptr, size, align.unwrap_or(Align::ONE), msg)?;
+        self.check_ptr_access_align(
+            mplace.ptr,
+            size,
+            align.unwrap_or(Align::ONE),
+            CheckInAllocMsg::DerefTest,
+        )?;
         Ok(())
     }
 

compiler/rustc_error_messages/locales/en-US/parser.ftl

@@ -375,3 +375,12 @@ parser_async_move_order_incorrect = the order of `move` and `async` is incorrect
 
 parser_double_colon_in_bound = expected `:` followed by trait or lifetime
     .suggestion = use single colon
+
+parser_fn_ptr_with_generics = function pointer types may not have generic parameters
+    .suggestion = consider moving the lifetime {$arity ->
+        [one] parameter
+        *[other] parameters
+    } to {$for_param_list_exists ->
+        [true] the
+        *[false] a
+    } `for` parameter list

compiler/rustc_errors/src/lib.rs

@@ -1254,6 +1254,10 @@ impl HandlerInner {
         }
 
         if diagnostic.has_future_breakage() {
+            // Future breakages aren't emitted if they're Level::Allowed,
+            // but they still need to be constructed and stashed below,
+            // so they'll trigger the good-path bug check.
+            self.suppressed_expected_diag = true;
             self.future_breakage_diagnostics.push(diagnostic.clone());
         }
 

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -333,7 +333,7 @@ fn expand_macro<'cx>(
     assert!(try_success_result.is_err(), "Macro matching returned a success on the second try");
 
     if let Some(result) = tracker.result {
-        // An irrecoverable error occured and has been emitted.
+        // An irrecoverable error occurred and has been emitted.
         return result;
     }
 

compiler/rustc_feature/src/builtin_attrs.rs

@@ -147,7 +147,7 @@ pub enum AttributeDuplicates {
     FutureWarnPreceding,
 }
 
-/// A conveniece macro to deal with `$($expr)?`.
+/// A convenience macro to deal with `$($expr)?`.
 macro_rules! or_default {
     ($default:expr,) => {
         $default

compiler/rustc_hir_typeck/src/closure.rs

@@ -35,7 +35,7 @@ struct ClosureSignatures<'tcx> {
     bound_sig: ty::PolyFnSig<'tcx>,
     /// The signature within the function body.
     /// This mostly differs in the sense that lifetimes are now early bound and any
-    /// opaque types from the signature expectation are overriden in case there are
+    /// opaque types from the signature expectation are overridden in case there are
     /// explicit hidden types written by the user in the closure signature.
     liberated_sig: ty::FnSig<'tcx>,
 }

compiler/rustc_lint/src/types.rs

@@ -360,7 +360,7 @@ fn lint_int_literal<'tcx>(
         }
 
         if lint_overflowing_range_endpoint(cx, lit, v, max, e, t.name_str()) {
-            // The overflowing literal lint was emited by `lint_overflowing_range_endpoint`.
+            // The overflowing literal lint was emitted by `lint_overflowing_range_endpoint`.
             return;
         }
 
@@ -429,7 +429,7 @@ fn lint_uint_literal<'tcx>(
             }
         }
         if lint_overflowing_range_endpoint(cx, lit, lit_val, max, e, t.name_str()) {
-            // The overflowing literal lint was emited by `lint_overflowing_range_endpoint`.
+            // The overflowing literal lint was emitted by `lint_overflowing_range_endpoint`.
             return;
         }
         if let Some(repr_str) = get_bin_hex_repr(cx, lit) {

compiler/rustc_middle/Cargo.toml

@@ -8,7 +8,7 @@ doctest = false
 
 [dependencies]
 bitflags = "1.2.1"
-chalk-ir = "0.80.0"
+chalk-ir = "0.87.0"
 either = "1.5.0"
 gsgdt = "0.1.2"
 polonius-engine = "0.13.0"

compiler/rustc_middle/src/mir/mod.rs

@@ -1541,7 +1541,7 @@ impl<'tcx> Place<'tcx> {
     /// If MirPhase >= Derefered and if projection contains Deref,
     /// It's guaranteed to be in the first place
     pub fn has_deref(&self) -> bool {
-        // To make sure this is not accidently used in wrong mir phase
+        // To make sure this is not accidentally used in wrong mir phase
         debug_assert!(
             self.projection.is_empty() || !self.projection[1..].contains(&PlaceElem::Deref)
         );

compiler/rustc_middle/src/mir/syntax.rs

@@ -85,7 +85,7 @@ pub enum MirPhase {
     ///
     /// Also note that the lint pass which reports eg `200_u8 + 200_u8` as an error is run as a part
     /// of analysis to runtime MIR lowering. To ensure lints are reported reliably, this means that
-    /// transformations which may supress such errors should not run on analysis MIR.
+    /// transformations which may suppress such errors should not run on analysis MIR.
     Runtime(RuntimePhase),
 }
 

compiler/rustc_mir_build/src/build/block.rs

@@ -118,7 +118,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     else_block: Some(else_block),
                 } => {
                     // When lowering the statement `let <pat> = <expr> else { <else> };`,
-                    // the `<else>` block is nested in the parent scope enclosing this statment.
+                    // the `<else>` block is nested in the parent scope enclosing this statement.
                     // That scope is usually either the enclosing block scope,
                     // or the remainder scope of the last statement.
                     // This is to make sure that temporaries instantiated in `<expr>` are dropped

compiler/rustc_mir_build/src/thir/pattern/mod.rs

@@ -577,6 +577,9 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
                     self.errors.push(PatternError::ConstParamInPattern(span));
                     return PatKind::Wild;
                 }
+                ConstKind::Error(_) => {
+                    return PatKind::Wild;
+                }
                 _ => bug!("Expected ConstKind::Param"),
             },
             mir::ConstantKind::Val(_, _) => self.const_to_pat(value, id, span, false).kind,

compiler/rustc_parse/src/errors.rs

@@ -1280,3 +1280,24 @@ pub(crate) struct DoubleColonInBound {
     #[suggestion(code = ": ", applicability = "machine-applicable")]
     pub between: Span,
 }
+
+#[derive(Diagnostic)]
+#[diag(parser_fn_ptr_with_generics)]
+pub(crate) struct FnPtrWithGenerics {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub sugg: Option<FnPtrWithGenericsSugg>,
+}
+
+#[derive(Subdiagnostic)]
+#[multipart_suggestion(suggestion, applicability = "maybe-incorrect")]
+pub(crate) struct FnPtrWithGenericsSugg {
+    #[suggestion_part(code = "{snippet}")]
+    pub left: Span,
+    pub snippet: String,
+    #[suggestion_part(code = "")]
+    pub right: Span,
+    pub arity: usize,
+    pub for_param_list_exists: bool,
+}

compiler/rustc_parse/src/lib.rs

@@ -3,6 +3,7 @@
 #![feature(array_windows)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
+#![feature(iter_intersperse)]
 #![feature(let_chains)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]

compiler/rustc_parse/src/parser/ty.rs

@@ -1,5 +1,6 @@
 use super::{Parser, PathStyle, TokenType};
 
+use crate::errors::{FnPtrWithGenerics, FnPtrWithGenericsSugg};
 use crate::{maybe_recover_from_interpolated_ty_qpath, maybe_whole};
 
 use rustc_ast::ptr::P;
@@ -270,14 +271,19 @@ impl<'a> Parser<'a> {
             TyKind::Infer
         } else if self.check_fn_front_matter(false, Case::Sensitive) {
             // Function pointer type
-            self.parse_ty_bare_fn(lo, Vec::new(), recover_return_sign)?
+            self.parse_ty_bare_fn(lo, Vec::new(), None, recover_return_sign)?
         } else if self.check_keyword(kw::For) {
             // Function pointer type or bound list (trait object type) starting with a poly-trait.
             //   `for<'lt> [unsafe] [extern "ABI"] fn (&'lt S) -> T`
             //   `for<'lt> Trait1<'lt> + Trait2 + 'a`
             let lifetime_defs = self.parse_late_bound_lifetime_defs()?;
             if self.check_fn_front_matter(false, Case::Sensitive) {
-                self.parse_ty_bare_fn(lo, lifetime_defs, recover_return_sign)?
+                self.parse_ty_bare_fn(
+                    lo,
+                    lifetime_defs,
+                    Some(self.prev_token.span.shrink_to_lo()),
+                    recover_return_sign,
+                )?
             } else {
                 let path = self.parse_path(PathStyle::Type)?;
                 let parse_plus = allow_plus == AllowPlus::Yes && self.check_plus();
@@ -519,7 +525,8 @@ impl<'a> Parser<'a> {
     fn parse_ty_bare_fn(
         &mut self,
         lo: Span,
-        params: Vec<GenericParam>,
+        mut params: Vec<GenericParam>,
+        param_insertion_point: Option<Span>,
         recover_return_sign: RecoverReturnSign,
     ) -> PResult<'a, TyKind> {
         let inherited_vis = rustc_ast::Visibility {
@@ -530,6 +537,9 @@ impl<'a> Parser<'a> {
         let span_start = self.token.span;
         let ast::FnHeader { ext, unsafety, constness, asyncness } =
             self.parse_fn_front_matter(&inherited_vis)?;
+        if self.may_recover() && self.token.kind == TokenKind::Lt {
+            self.recover_fn_ptr_with_generics(lo, &mut params, param_insertion_point)?;
+        }
         let decl = self.parse_fn_decl(|_| false, AllowPlus::No, recover_return_sign)?;
         let whole_span = lo.to(self.prev_token.span);
         if let ast::Const::Yes(span) = constness {
@@ -545,6 +555,48 @@ impl<'a> Parser<'a> {
         Ok(TyKind::BareFn(P(BareFnTy { ext, unsafety, generic_params: params, decl, decl_span })))
     }
 
+    /// Recover from function pointer types with a generic parameter list (e.g. `fn<'a>(&'a str)`).
+    fn recover_fn_ptr_with_generics(
+        &mut self,
+        lo: Span,
+        params: &mut Vec<GenericParam>,
+        param_insertion_point: Option<Span>,
+    ) -> PResult<'a, ()> {
+        let generics = self.parse_generics()?;
+        let arity = generics.params.len();
+
+        let mut lifetimes: Vec<_> = generics
+            .params
+            .into_iter()
+            .filter(|param| matches!(param.kind, ast::GenericParamKind::Lifetime))
+            .collect();
+
+        let sugg = if !lifetimes.is_empty() {
+            let snippet =
+                lifetimes.iter().map(|param| param.ident.as_str()).intersperse(", ").collect();
+
+            let (left, snippet) = if let Some(span) = param_insertion_point {
+                (span, if params.is_empty() { snippet } else { format!(", {snippet}") })
+            } else {
+                (lo.shrink_to_lo(), format!("for<{snippet}> "))
+            };
+
+            Some(FnPtrWithGenericsSugg {
+                left,
+                snippet,
+                right: generics.span,
+                arity,
+                for_param_list_exists: param_insertion_point.is_some(),
+            })
+        } else {
+            None
+        };
+
+        self.sess.emit_err(FnPtrWithGenerics { span: generics.span, sugg });
+        params.append(&mut lifetimes);
+        Ok(())
+    }
+
     /// Emit an error for the given bad function pointer qualifier.
     fn error_fn_ptr_bad_qualifier(&self, span: Span, qual_span: Span, qual: &str) {
         self.struct_span_err(span, &format!("an `fn` pointer type cannot be `{}`", qual))

compiler/rustc_resolve/src/effective_visibilities.rs

@@ -72,7 +72,7 @@ impl<'r, 'a> EffectiveVisibilitiesVisitor<'r, 'a> {
                 update(node_id);
                 if let ImportKind::Single { additional_ids: (id1, id2), .. } = import.kind {
                     // In theory all the single import IDs have individual visibilities and
-                    // effective visibilities, but in practice these IDs go straigth to HIR
+                    // effective visibilities, but in practice these IDs go straight to HIR
                     // where all their few uses assume that their (effective) visibility
                     // applies to the whole syntactic `use` item. So they all get the same
                     // value which is the maximum of all bindings. Maybe HIR for imports

compiler/rustc_resolve/src/lib.rs

@@ -1932,6 +1932,11 @@ impl<'a> Resolver<'a> {
         }
     }
 
+    /// For rustdoc.
+    pub fn get_partial_res(&self, node_id: NodeId) -> Option<PartialRes> {
+        self.partial_res_map.get(&node_id).copied()
+    }
+
     /// Retrieves the span of the given `DefId` if `DefId` is in the local crate.
     #[inline]
     pub fn opt_span(&self, def_id: DefId) -> Option<Span> {

compiler/rustc_target/src/spec/mod.rs

@@ -114,7 +114,7 @@ pub enum Lld {
 /// relevant now.
 ///
 /// The second goal is to keep the number of flavors to the minimum if possible.
-/// LLD somewhat forces our hand here because that linker is self-sufficent only if its executable
+/// LLD somewhat forces our hand here because that linker is self-sufficient only if its executable
 /// (`argv[0]`) is named in specific way, otherwise it doesn't work and requires a
 /// `-flavor LLD_FLAVOR` argument to choose which logic to use. Our shipped `rust-lld` in
 /// particular is not named in such specific way, so it needs the flavor option, so we make our