bjoernager/rust
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Assemble object bound candidates

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This commit is contained in:
Michael Goulet 2023-01-17 18:19:11 +00:00
parent f99b273d57
commit 3d87a8e848
1 changed files with 52 additions and 0 deletions
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52
compiler/rustc_trait_selection/src/solve/assembly.rs
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@ -4,6 +4,7 @@ use super::infcx_ext::InferCtxtExt;
use super::{CanonicalResponse, EvalCtxt, Goal, QueryResult};
use rustc_hir::def_id::DefId;
use rustc_infer::traits::query::NoSolution;
use rustc_infer::traits::util::elaborate_predicates;
use rustc_middle::ty::TypeFoldable;
use rustc_middle::ty::{self, Ty, TyCtxt};
use std::fmt::Debug;
@ -119,6 +120,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
self.assemble_alias_bound_candidates(goal, &mut candidates);
self.assemble_object_bound_candidates(goal, &mut candidates);
candidates
}
@ -272,4 +275,53 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
}
}
}
fn assemble_object_bound_candidates<G: GoalKind<'tcx>>(
&mut self,
goal: Goal<'tcx, G>,
candidates: &mut Vec<Candidate<'tcx>>,
) {
let self_ty = goal.predicate.self_ty();
let bounds = match *self_ty.kind() {
ty::Bool
| ty::Char
| ty::Int(_)
| ty::Uint(_)
| ty::Float(_)
| ty::Adt(_, _)
| ty::Foreign(_)
| ty::Str
| ty::Array(_, _)
| ty::Slice(_)
| ty::RawPtr(_)
| ty::Ref(_, _, _)
| ty::FnDef(_, _)
| ty::FnPtr(_)
| ty::Alias(..)
| ty::Closure(..)
| ty::Generator(..)
| ty::GeneratorWitness(_)
| ty::Never
| ty::Tuple(_)
| ty::Param(_)
| ty::Placeholder(..)
| ty::Infer(_)
| ty::Error(_) => return,
ty::Bound(..) => bug!("unexpected bound type: {goal:?}"),
ty::Dynamic(bounds, ..) => bounds,
};
let tcx = self.tcx();
for assumption in
elaborate_predicates(tcx, bounds.iter().map(|bound| bound.with_self_ty(tcx, self_ty)))
{
match G::consider_assumption(self, goal, assumption.predicate)
{
Ok(result) => {
candidates.push(Candidate { source: CandidateSource::BuiltinImpl, result })
}
Err(NoSolution) => (),
}
}
}
}