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Properly generate multiple candidates for trait upcasting coercion.

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This commit is contained in:
Charles Lew 2021-08-18 02:41:29 +08:00
parent adf1688447
commit 1e605023ec
8 changed files with 155 additions and 159 deletions
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5
compiler/rustc_middle/src/traits/select.rs
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@ -135,6 +135,11 @@ pub enum SelectionCandidate<'tcx> {
/// `rustc_infer::traits::util::supertraits`.
ObjectCandidate(usize),
/// Perform trait upcasting coercion of `dyn Trait` to a supertrait of `Trait`.
/// The index is the position in the iterator returned by
/// `rustc_infer::traits::util::supertraits`.
TraitUpcastingUnsizeCandidate(usize),
BuiltinObjectCandidate,
BuiltinUnsizeCandidate,