{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"impl<$($K:"}]}
        impl<$($K: $Kb,)? $vis_ty: MutVisitor> MutWalkable<$vis_ty> for $self_ty {
        #[allow(unused_parens, non_local_definitions)]
            fn walk_mut(&mut $self, $vis: &mut $vis_ty) -> V::Result {