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Rollup merge of #122881 - Bryanskiy:delegation-fixes-2, r=petrochenkov
Delegation: fix ICE on `bound_vars` divergence Fixes https://github.com/rust-lang/rust/issues/122550. Bug was caused by divergence between lowered type and corresponding `bound_vars` in `late_bound_vars_map`. In this patch `bound_vars` calculation for delegation item is moved from `lower_fn_ty` to `resolve_bound_vars` query. r? `@petrochenkov`
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commit
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@ -793,12 +793,20 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
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fd: &'tcx hir::FnDecl<'tcx>,
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body_id: hir::BodyId,
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_: Span,
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_: LocalDefId,
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def_id: LocalDefId,
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) {
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let output = match fd.output {
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hir::FnRetTy::DefaultReturn(_) => None,
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hir::FnRetTy::Return(ty) => Some(ty),
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};
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if let Some(ty) = output
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&& let hir::TyKind::InferDelegation(sig_id, _) = ty.kind
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{
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let bound_vars: Vec<_> =
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self.tcx.fn_sig(sig_id).skip_binder().bound_vars().iter().collect();
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let hir_id = self.tcx.local_def_id_to_hir_id(def_id);
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self.map.late_bound_vars.insert(hir_id, bound_vars);
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}
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self.visit_fn_like_elision(fd.inputs, output, matches!(fk, intravisit::FnKind::Closure));
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intravisit::walk_fn_kind(self, fk);
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self.visit_nested_body(body_id)
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@ -2492,13 +2492,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
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hir_ty: Option<&hir::Ty<'_>>,
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) -> ty::PolyFnSig<'tcx> {
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let tcx = self.tcx();
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let bound_vars = if let hir::FnRetTy::Return(ret_ty) = decl.output
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&& let hir::TyKind::InferDelegation(sig_id, _) = ret_ty.kind
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{
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tcx.fn_sig(sig_id).skip_binder().bound_vars()
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} else {
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tcx.late_bound_vars(hir_id)
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};
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let bound_vars = tcx.late_bound_vars(hir_id);
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debug!(?bound_vars);
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// We proactively collect all the inferred type params to emit a single error per fn def.
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18
tests/ui/delegation/ice-issue-122550.rs
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18
tests/ui/delegation/ice-issue-122550.rs
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@ -0,0 +1,18 @@
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#![feature(fn_delegation)]
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#![allow(incomplete_features)]
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trait Trait {
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fn description(&self) -> &str {}
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//~^ ERROR mismatched types
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}
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struct F;
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struct S(F);
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impl S {
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reuse <S as Trait>::description { &self.0 }
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//~^ ERROR mismatched types
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//~| ERROR the trait bound `S: Trait` is not satisfied
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}
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fn main() {}
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31
tests/ui/delegation/ice-issue-122550.stderr
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31
tests/ui/delegation/ice-issue-122550.stderr
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@ -0,0 +1,31 @@
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error[E0308]: mismatched types
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--> $DIR/ice-issue-122550.rs:5:35
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LL | fn description(&self) -> &str {}
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| ^^ expected `&str`, found `()`
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error[E0308]: mismatched types
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--> $DIR/ice-issue-122550.rs:13:39
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LL | reuse <S as Trait>::description { &self.0 }
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| ^^^^^^^ expected `&S`, found `&F`
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= note: expected reference `&S`
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found reference `&F`
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error[E0277]: the trait bound `S: Trait` is not satisfied
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--> $DIR/ice-issue-122550.rs:13:12
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LL | reuse <S as Trait>::description { &self.0 }
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| ^ the trait `Trait` is not implemented for `S`
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help: this trait has no implementations, consider adding one
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--> $DIR/ice-issue-122550.rs:4:1
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LL | trait Trait {
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| ^^^^^^^^^^^
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0277, E0308.
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For more information about an error, try `rustc --explain E0277`.
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