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Normalize struct types in confirm_builtin_unsize_candidate

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This commit is contained in:
Michael Goulet
2022-09-15 01:13:46 +00:00
parent 6153d3cbe6
commit 7893ca74e5
3 changed files with 58 additions and 3 deletions
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22
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
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@@ -1039,9 +1039,25 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
return Err(Unimplemented);
}
// Extract `TailField<T>` and `TailField<U>` from `Struct<T>` and `Struct<U>`.
let source_tail = tail_field_ty.subst(tcx, substs_a);
let target_tail = tail_field_ty.subst(tcx, substs_b);
// Extract `TailField<T>` and `TailField<U>` from `Struct<T>` and `Struct<U>`,
// normalizing in the process, since `type_of` returns something directly from
// astconv (which means it's un-normalized).
let source_tail = normalize_with_depth_to(
self,
obligation.param_env,
obligation.cause.clone(),
obligation.recursion_depth + 1,
tail_field_ty.subst(tcx, substs_a),
&mut nested,
);
let target_tail = normalize_with_depth_to(
self,
obligation.param_env,
obligation.cause.clone(),
obligation.recursion_depth + 1,
tail_field_ty.subst(tcx, substs_b),
&mut nested,
);
// Check that the source struct with the target's
// unsizing parameters is equal to the target.