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Auto merge of #87515 - crlf0710:trait_upcasting_part2, r=bjorn3

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Trait upcasting coercion (part2)

This is the second part of trait upcasting coercion implementation.

Currently this is blocked on #86264 .

The third part might be implemented using unsafety checking

r? `@bjorn3`
This commit is contained in:
bors 2021-08-03 16:58:56 +00:00
commit c6bc102fea
22 changed files with 1186 additions and 93 deletions
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5
compiler/rustc_middle/src/query/mod.rs
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@ -977,6 +977,11 @@ rustc_queries! {
desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
}
query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::PolyTraitRef<'tcx>, ty::PolyTraitRef<'tcx>)) -> Option<usize> {
desc { |tcx| "finding the slot within vtable for trait {} vtable ptr during trait upcasting coercion from {} vtable",
tcx.def_path_str(key.1.def_id()), tcx.def_path_str(key.0.def_id()) }
}
query codegen_fulfill_obligation(
key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
) -> Result<ImplSource<'tcx, ()>, ErrorReported> {