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Use codegen_select in vtable_trait_upcasting_coercion_new_vptr_slot #103861

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Nov 6, 2022
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Use codegen_select in vtable_trait_upcasting_coercion_new_vptr_slot #103861

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24 changes: 6 additions & 18 deletions compiler/rustc_trait_selection/src/traits/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -933,25 +933,13 @@ pub fn vtable_trait_upcasting_coercion_new_vptr_slot<'tcx>(
def_id: unsize_trait_did,
substs: tcx.mk_substs_trait(source, &[target.into()]),
};
let obligation = Obligation::new(
ObligationCause::dummy(),
ty::ParamEnv::reveal_all(),
ty::Binder::dummy(ty::TraitPredicate {
trait_ref,
constness: ty::BoundConstness::NotConst,
polarity: ty::ImplPolarity::Positive,
}),
);

let infcx = tcx.infer_ctxt().build();
let mut selcx = SelectionContext::new(&infcx);
let implsrc = selcx.select(&obligation).unwrap();

let Some(ImplSource::TraitUpcasting(implsrc_traitcasting)) = implsrc else {
bug!();
};

implsrc_traitcasting.vtable_vptr_slot
match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), ty::Binder::dummy(trait_ref))) {
Ok(ImplSource::TraitUpcasting(implsrc_traitcasting)) => {
implsrc_traitcasting.vtable_vptr_slot
}
otherwise => bug!("expected TraitUpcasting candidate, got {otherwise:?}"),
}
}

pub fn provide(providers: &mut ty::query::Providers) {
Expand Down