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Debug-assert that closures and generators are made with the right number of substitutions #112189

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Jun 2, 2023
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Debug-assert that closures and generators are made with the right number of substitutions #112189

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18 changes: 14 additions & 4 deletions compiler/rustc_middle/src/ty/context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1872,18 +1872,28 @@ impl<'tcx> TyCtxt<'tcx> {
}

#[inline]
pub fn mk_closure(self, closure_id: DefId, closure_substs: SubstsRef<'tcx>) -> Ty<'tcx> {
self.mk_ty_from_kind(Closure(closure_id, closure_substs))
pub fn mk_closure(self, def_id: DefId, closure_substs: SubstsRef<'tcx>) -> Ty<'tcx> {
debug_assert_eq!(
closure_substs.len(),
self.generics_of(self.typeck_root_def_id(def_id)).count() + 3,
"closure constructed with incorrect substitutions"
);
self.mk_ty_from_kind(Closure(def_id, closure_substs))
}

#[inline]
pub fn mk_generator(
self,
id: DefId,
def_id: DefId,
generator_substs: SubstsRef<'tcx>,
movability: hir::Movability,
) -> Ty<'tcx> {
self.mk_ty_from_kind(Generator(id, generator_substs, movability))
debug_assert_eq!(
generator_substs.len(),
self.generics_of(self.typeck_root_def_id(def_id)).count() + 5,
"generator constructed with incorrect number of substitutions"
);
self.mk_ty_from_kind(Generator(def_id, generator_substs, movability))
}

#[inline]
Expand Down