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Normalize the RHS of an unsize goal

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This commit is contained in:
Michael Goulet 2023-07-06 02:53:21 +00:00
parent 23405bb123
commit 7e66c0b7ed
5 changed files with 169 additions and 69 deletions
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10
compiler/rustc_trait_selection/src/solve/eval_ctxt/select.rs
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@ -330,9 +330,13 @@ fn rematch_unsize<'tcx>(
mut nested: Vec<PredicateObligation<'tcx>>,
) -> SelectionResult<'tcx, Selection<'tcx>> {
let tcx = infcx.tcx;
let a_ty = goal.predicate.self_ty();
let b_ty = goal.predicate.trait_ref.args.type_at(1);
let a_ty = structurally_normalize(goal.predicate.self_ty(), infcx, goal.param_env, &mut nested);
let b_ty = structurally_normalize(
goal.predicate.trait_ref.args.type_at(1),
infcx,
goal.param_env,
&mut nested,
);
match (a_ty.kind(), b_ty.kind()) {
(_, &ty::Dynamic(data, region, ty::Dyn)) => {
// Check that the type implements all of the predicates of the def-id.