X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_macros%2Fsrc%2Ftype_foldable.rs;h=9f448a593da508128e74f7cbd7ebb71b7251b9c6;hb=cf683e644f1822400ea22c7da5de40b5b395a194;hp=082af087bf49fd720236862aa438776024495b49;hpb=fdee059c9050d8135dc98db8c90b225c9e6b085a;p=rust.git

diff --git a/compiler/rustc_macros/src/type_foldable.rs b/compiler/rustc_macros/src/type_foldable.rs
index 082af087bf4..9f448a593da 100644
--- a/compiler/rustc_macros/src/type_foldable.rs
+++ b/compiler/rustc_macros/src/type_foldable.rs
@@ -17,7 +17,7 @@ pub fn type_foldable_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::
         vi.construct(|_, index| {
             let bind = &bindings[index];
             quote! {
-                ::rustc_middle::ty::fold::TypeFoldable::fold_with(#bind, __folder)
+                ::rustc_middle::ty::fold::TypeFoldable::try_fold_with(#bind, __folder)?
             }
         })
     });
@@ -25,11 +25,11 @@ pub fn type_foldable_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::
     s.bound_impl(
         quote!(::rustc_middle::ty::fold::TypeFoldable<'tcx>),
         quote! {
-            fn super_fold_with<__F: ::rustc_middle::ty::fold::TypeFolder<'tcx>>(
+            fn try_super_fold_with<__F: ::rustc_middle::ty::fold::FallibleTypeFolder<'tcx>>(
                 self,
                 __folder: &mut __F
-            ) -> Self {
-                match self { #body_fold }
+            ) -> Result<Self, __F::Error> {
+                Ok(match self { #body_fold })
             }
 
             fn super_visit_with<__F: ::rustc_middle::ty::fold::TypeVisitor<'tcx>>(