rustboot: Emit an error instead of asserting in trans when a T is passed by value

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/list.rs b/src/lib/list.rs
index 7b8613151e7..da8d3c0aff7 100644
--- a/src/lib/list.rs
+++ b/src/lib/list.rs
@@ -12,7 +12,7 @@ tag list[T] {
     nil;
 }
 
-fn foldl[T,U](&list[T] ls, U u, fn(&T t, U u) -> U f) -> U {
+fn foldl[T,U](&list[T] ls, &U u, fn(&T t, U u) -> U f) -> U {
   alt(ls) {
     case (cons[T](?hd, ?tl)) {
       auto u_ = f(hd, u);