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Add wf_clause_for_fn_def

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This commit is contained in:
scalexm 2018-11-28 23:29:26 +01:00
parent 26e0ea8148
commit 8e2bdaacac
1 changed files with 21 additions and 1 deletions
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22
src/librustc_traits/chalk_context/program_clauses.rs
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@ -343,6 +343,24 @@ fn wf_clause_for_ref<'tcx>(
tcx.mk_clauses(iter::once(wf_clause))
}
fn wf_clause_for_fn_def<'tcx>(
tcx: ty::TyCtxt<'_, '_, 'tcx>,
def_id: DefId
) -> Clauses<'tcx> {
let fn_def = generic_types::fn_def(tcx, def_id);
let wf_clause = ProgramClause {
goal: DomainGoal::WellFormed(WellFormed::Ty(fn_def)),
hypotheses: ty::List::empty(),
category: ProgramClauseCategory::WellFormed,
};
let wf_clause = Clause::ForAll(ty::Binder::bind(wf_clause));
// `forall <T1, ..., Tn+1> { WellFormed(fn some_fn(T1, ..., Tn) -> Tn+1). }`
// where `def_id` maps to the `some_fn` function definition
tcx.mk_clauses(iter::once(wf_clause))
}
impl ChalkInferenceContext<'cx, 'gcx, 'tcx> {
pub(super) fn program_clauses_impl(
&self,
@ -506,6 +524,8 @@ impl ChalkInferenceContext<'cx, 'gcx, 'tcx> {
// WF if `sub_ty` outlives `region`.
ty::Ref(_, _, mutbl) => wf_clause_for_ref(self.infcx.tcx, mutbl),
ty::FnDef(def_id, ..) => wf_clause_for_fn_def(self.infcx.tcx, def_id),
ty::Dynamic(..) => {
// FIXME: no rules yet for trait objects
ty::List::empty()
@ -515,8 +535,8 @@ impl ChalkInferenceContext<'cx, 'gcx, 'tcx> {
self.infcx.tcx.program_clauses_for(def.did)
}
// FIXME: these are probably wrong
ty::Foreign(def_id) |
ty::FnDef(def_id, ..) |
ty::Closure(def_id, ..) |
ty::Generator(def_id, ..) |
ty::Opaque(def_id, ..) => {