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Fold vtable_trait_upcasting_coercion_new_vptr_slot logic into obligation processing.

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This commit is contained in:
Charles Lew 2021-08-18 12:45:18 +08:00
parent 1e605023ec
commit 6b1c52ff25
11 changed files with 137 additions and 87 deletions
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5
compiler/rustc_trait_selection/src/traits/project.rs
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@ -1483,7 +1483,9 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
// why we special case object types.
false
}
super::ImplSource::AutoImpl(..) | super::ImplSource::Builtin(..) => {
super::ImplSource::AutoImpl(..)
| super::ImplSource::Builtin(..)
| super::ImplSource::TraitUpcasting(_) => {
// These traits have no associated types.
selcx.tcx().sess.delay_span_bug(
obligation.cause.span,
@ -1554,6 +1556,7 @@ fn confirm_select_candidate<'cx, 'tcx>(
| super::ImplSource::AutoImpl(..)
| super::ImplSource::Param(..)
| super::ImplSource::Builtin(..)
| super::ImplSource::TraitUpcasting(_)
| super::ImplSource::TraitAlias(..) => {
// we don't create Select candidates with this kind of resolution
span_bug!(