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-rw-r--r--compiler/rustc_middle/src/ty/walk.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/ty/walk.rs b/compiler/rustc_middle/src/ty/walk.rs
index 708a5e4d0..182945b9c 100644
--- a/compiler/rustc_middle/src/ty/walk.rs
+++ b/compiler/rustc_middle/src/ty/walk.rs
@@ -190,6 +190,7 @@ fn push_inner<'tcx>(stack: &mut TypeWalkerStack<'tcx>, parent: GenericArg<'tcx>)
ty::Adt(_, substs)
| ty::Closure(_, substs)
| ty::Generator(_, substs, _)
+ | ty::GeneratorWitnessMIR(_, substs)
| ty::FnDef(_, substs) => {
stack.extend(substs.iter().rev());
}