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Add derived causes for host effect predicates

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This commit is contained in:
Michael Goulet
2024-12-10 22:08:44 +00:00
parent 243d2ca4db
commit 2be9ffc1af
15 changed files with 278 additions and 39 deletions
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21
compiler/rustc_trait_selection/src/traits/effects.rs
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@@ -1,6 +1,8 @@
use rustc_hir as hir;
use rustc_infer::infer::{BoundRegionConversionTime, DefineOpaqueTypes};
use rustc_infer::traits::{ImplSource, Obligation, PredicateObligation};
use rustc_infer::traits::{
ImplDerivedHostCause, ImplSource, Obligation, ObligationCauseCode, PredicateObligation,
};
use rustc_middle::span_bug;
use rustc_middle::ty::fast_reject::DeepRejectCtxt;
use rustc_middle::ty::{self, TypingMode};
@@ -248,9 +250,22 @@ fn evaluate_host_effect_from_selection_candiate<'tcx>(
tcx.const_conditions(impl_.impl_def_id)
.instantiate(tcx, impl_.args)
.into_iter()
.map(|(trait_ref, _)| {
obligation.with(
.map(|(trait_ref, span)| {
Obligation::new(
tcx,
obligation.cause.clone().derived_host_cause(
ty::Binder::dummy(obligation.predicate),
|derived| {
ObligationCauseCode::ImplDerivedHost(Box::new(
ImplDerivedHostCause {
derived,
impl_def_id: impl_.impl_def_id,
span,
},
))
},
),
obligation.param_env,
trait_ref
.to_host_effect_clause(tcx, obligation.predicate.constness),
)