Rollup merge of #96377 - compiler-errors:infer-rustfix, r=petrochenkov

make `fn() -> _ { .. }` suggestion MachineApplicable

This might not be valid, but it would be nice to promote this to `MachineApplicable` so people can use rustfix here.

Also de65fcf009d07019689cfad7f327667e390a325d is to [restore the suggestion for `issue-77179.rs`](https://github.com/rust-lang/rust/commit/de65fcf009d07019689cfad7f327667e390a325d#diff-12e43fb5d6d12ec7cb5c6b48204a18d113cf5de0e12eb71a358b639bd9aadaf0R8). (though in this case, the code in that issue still doesn't compile, so it's not marked with rustfix).

5 files changed, 46 insertions, 35 deletions

diff --git a/compiler/rustc_middle/src/ty/diagnostics.rs b/compiler/rustc_middle/src/ty/diagnostics.rs
index 3b044b19259..8c8a2650fd6 100644
--- a/compiler/rustc_middle/src/ty/diagnostics.rs
+++ b/compiler/rustc_middle/src/ty/diagnostics.rs
@@ -3,8 +3,8 @@
 use crate::ty::subst::{GenericArg, GenericArgKind};
 use crate::ty::TyKind::*;
 use crate::ty::{
-    ConstKind, ExistentialPredicate, ExistentialProjection, ExistentialTraitRef, InferTy,
-    ProjectionTy, Term, Ty, TyCtxt, TypeAndMut,
+    ConstKind, DefIdTree, ExistentialPredicate, ExistentialProjection, ExistentialTraitRef,
+    InferTy, ProjectionTy, Term, Ty, TyCtxt, TypeAndMut,
 };
 
 use rustc_data_structures::fx::FxHashMap;
@@ -74,10 +74,10 @@ impl<'tcx> Ty<'tcx> {
     }
 
     /// Whether the type can be safely suggested during error recovery.
-    pub fn is_suggestable(self) -> bool {
-        fn generic_arg_is_suggestible(arg: GenericArg<'_>) -> bool {
+    pub fn is_suggestable(self, tcx: TyCtxt<'tcx>) -> bool {
+        fn generic_arg_is_suggestible<'tcx>(arg: GenericArg<'tcx>, tcx: TyCtxt<'tcx>) -> bool {
             match arg.unpack() {
-                GenericArgKind::Type(ty) => ty.is_suggestable(),
+                GenericArgKind::Type(ty) => ty.is_suggestable(tcx),
                 GenericArgKind::Const(c) => const_is_suggestable(c.val()),
                 _ => true,
             }
@@ -99,8 +99,7 @@ impl<'tcx> Ty<'tcx> {
         // temporary, so I'll leave this as a fixme.
 
         match self.kind() {
-            Opaque(..)
-            | FnDef(..)
+            FnDef(..)
             | Closure(..)
             | Infer(..)
             | Generator(..)
@@ -108,27 +107,38 @@ impl<'tcx> Ty<'tcx> {
             | Bound(_, _)
             | Placeholder(_)
             | Error(_) => false,
+            Opaque(did, substs) => {
+                let parent = tcx.parent(*did).expect("opaque types always have a parent");
+                if let hir::def::DefKind::TyAlias | hir::def::DefKind::AssocTy = tcx.def_kind(parent)
+                    && let Opaque(parent_did, _) = tcx.type_of(parent).kind()
+                    && parent_did == did
+                {
+                    substs.iter().all(|a| generic_arg_is_suggestible(a, tcx))
+                } else {
+                    false
+                }
+            }
             Dynamic(dty, _) => dty.iter().all(|pred| match pred.skip_binder() {
                 ExistentialPredicate::Trait(ExistentialTraitRef { substs, .. }) => {
-                    substs.iter().all(generic_arg_is_suggestible)
+                    substs.iter().all(|a| generic_arg_is_suggestible(a, tcx))
                 }
                 ExistentialPredicate::Projection(ExistentialProjection {
                     substs, term, ..
                 }) => {
                     let term_is_suggestable = match term {
-                        Term::Ty(ty) => ty.is_suggestable(),
+                        Term::Ty(ty) => ty.is_suggestable(tcx),
                         Term::Const(c) => const_is_suggestable(c.val()),
                     };
-                    term_is_suggestable && substs.iter().all(generic_arg_is_suggestible)
+                    term_is_suggestable && substs.iter().all(|a| generic_arg_is_suggestible(a, tcx))
                 }
                 _ => true,
             }),
             Projection(ProjectionTy { substs: args, .. }) | Adt(_, args) => {
-                args.iter().all(generic_arg_is_suggestible)
+                args.iter().all(|a| generic_arg_is_suggestible(a, tcx))
             }
-            Tuple(args) => args.iter().all(|ty| ty.is_suggestable()),
-            Slice(ty) | RawPtr(TypeAndMut { ty, .. }) | Ref(_, ty, _) => ty.is_suggestable(),
-            Array(ty, c) => ty.is_suggestable() && const_is_suggestable(c.val()),
+            Tuple(args) => args.iter().all(|ty| ty.is_suggestable(tcx)),
+            Slice(ty) | RawPtr(TypeAndMut { ty, .. }) | Ref(_, ty, _) => ty.is_suggestable(tcx),
+            Array(ty, c) => ty.is_suggestable(tcx) && const_is_suggestable(c.val()),
             _ => true,
         }
     }
diff --git a/compiler/rustc_typeck/src/astconv/generics.rs b/compiler/rustc_typeck/src/astconv/generics.rs
index 5f5b81b8924..794e711b6c8 100644
--- a/compiler/rustc_typeck/src/astconv/generics.rs
+++ b/compiler/rustc_typeck/src/astconv/generics.rs
@@ -86,7 +86,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                         let param_type = tcx.infer_ctxt().enter(|infcx| {
                             infcx.resolve_numeric_literals_with_default(tcx.type_of(param.def_id))
                         });
-                        if param_type.is_suggestable() {
+                        if param_type.is_suggestable(tcx) {
                             err.span_suggestion(
                                 tcx.def_span(src_def_id),
                                 "consider changing this type parameter to be a `const` generic",
diff --git a/compiler/rustc_typeck/src/astconv/mod.rs b/compiler/rustc_typeck/src/astconv/mod.rs
index 1caf93e5fe0..3e36ffa7fe0 100644
--- a/compiler/rustc_typeck/src/astconv/mod.rs
+++ b/compiler/rustc_typeck/src/astconv/mod.rs
@@ -2466,7 +2466,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                     span,
                     ty,
                     opt_sugg: Some((span, Applicability::MachineApplicable))
-                        .filter(|_| ty.is_suggestable()),
+                        .filter(|_| ty.is_suggestable(tcx)),
                 });
 
                 ty
diff --git a/compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs b/compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs
index 62518408b8b..8db9da7fcb2 100644
--- a/compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs
@@ -525,7 +525,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             self.resolve_numeric_literals_with_default(self.resolve_vars_if_possible(found));
         // Only suggest changing the return type for methods that
         // haven't set a return type at all (and aren't `fn main()` or an impl).
-        match (&fn_decl.output, found.is_suggestable(), can_suggest, expected.is_unit()) {
+        match (&fn_decl.output, found.is_suggestable(self.tcx), can_suggest, expected.is_unit()) {
             (&hir::FnRetTy::DefaultReturn(span), true, true, true) => {
                 err.span_suggestion(
                     span,
diff --git a/compiler/rustc_typeck/src/collect.rs b/compiler/rustc_typeck/src/collect.rs
index be77bdb0bf5..0ccc2b6b182 100644
--- a/compiler/rustc_typeck/src/collect.rs
+++ b/compiler/rustc_typeck/src/collect.rs
@@ -41,7 +41,7 @@ use rustc_middle::ty::subst::InternalSubsts;
 use rustc_middle::ty::util::Discr;
 use rustc_middle::ty::util::IntTypeExt;
 use rustc_middle::ty::{self, AdtKind, Const, DefIdTree, Ty, TyCtxt};
-use rustc_middle::ty::{ReprOptions, ToPredicate, TypeFoldable};
+use rustc_middle::ty::{ReprOptions, ToPredicate};
 use rustc_session::lint;
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
@@ -2004,28 +2004,29 @@ fn infer_return_ty_for_fn_sig<'tcx>(
             visitor.visit_ty(ty);
             let mut diag = bad_placeholder(tcx, visitor.0, "return type");
             let ret_ty = fn_sig.skip_binder().output();
-            if !ret_ty.references_error() {
-                if !ret_ty.is_closure() {
-                    let ret_ty_str = match ret_ty.kind() {
-                        // Suggest a function pointer return type instead of a unique function definition
-                        // (e.g. `fn() -> i32` instead of `fn() -> i32 { f }`, the latter of which is invalid
-                        // syntax)
-                        ty::FnDef(..) => ret_ty.fn_sig(tcx).to_string(),
-                        _ => ret_ty.to_string(),
-                    };
+            if ret_ty.is_suggestable(tcx) {
+                diag.span_suggestion(
+                    ty.span,
+                    "replace with the correct return type",
+                    ret_ty.to_string(),
+                    Applicability::MachineApplicable,
+                );
+            } else if matches!(ret_ty.kind(), ty::FnDef(..)) {
+                let fn_sig = ret_ty.fn_sig(tcx);
+                if fn_sig.skip_binder().inputs_and_output.iter().all(|t| t.is_suggestable(tcx)) {
                     diag.span_suggestion(
                         ty.span,
                         "replace with the correct return type",
-                        ret_ty_str,
-                        Applicability::MaybeIncorrect,
+                        fn_sig.to_string(),
+                        Applicability::MachineApplicable,
                     );
-                } else {
-                    // We're dealing with a closure, so we should suggest using `impl Fn` or trait bounds
-                    // to prevent the user from getting a papercut while trying to use the unique closure
-                    // syntax (e.g. `[closure@src/lib.rs:2:5: 2:9]`).
-                    diag.help("consider using an `Fn`, `FnMut`, or `FnOnce` trait bound");
-                    diag.note("for more information on `Fn` traits and closure types, see https://doc.rust-lang.org/book/ch13-01-closures.html");
                 }
+            } else if ret_ty.is_closure() {
+                // We're dealing with a closure, so we should suggest using `impl Fn` or trait bounds
+                // to prevent the user from getting a papercut while trying to use the unique closure
+                // syntax (e.g. `[closure@src/lib.rs:2:5: 2:9]`).
+                diag.help("consider using an `Fn`, `FnMut`, or `FnOnce` trait bound");
+                diag.note("for more information on `Fn` traits and closure types, see https://doc.rust-lang.org/book/ch13-01-closures.html");
             }
             diag.emit();