1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_monomorphize/src/polymorphize.rs b/compiler/rustc_monomorphize/src/polymorphize.rs
index 5a24202db65..b59c7bcffa9 100644
--- a/compiler/rustc_monomorphize/src/polymorphize.rs
+++ b/compiler/rustc_monomorphize/src/polymorphize.rs
@@ -127,7 +127,7 @@ fn mark_used_by_default_parameters<'tcx>(
     unused_parameters: &mut UnusedGenericParams,
 ) {
     match tcx.def_kind(def_id) {
-        DefKind::Closure => {
+        DefKind::Closure | DefKind::SyntheticCoroutineBody => {
             for param in &generics.own_params {
                 debug!(?param, "(closure/gen)");
                 unused_parameters.mark_used(param.index);