diff --git a/src/comp/middle/last_use.rs b/src/comp/middle/last_use.rs
index 4b0ff3c7b38..0a78a5fb0cd 100644
--- a/src/comp/middle/last_use.rs
+++ b/src/comp/middle/last_use.rs
@@ -129,14 +129,21 @@ fn visit_expr(ex: @expr, cx: ctx, v: visit::vt<ctx>) {
       }
       expr_call(f, args, _) {
         v.visit_expr(f, cx, v);
-        let i = 0u;
-        for arg_t in ty::ty_fn_args(cx.tcx, ty::expr_ty(cx.tcx, f)) {
-            alt arg_t.mode {
-              by_mut_ref. { clear_if_path(cx, args[i], v, false); }
-              _ { v.visit_expr(args[i], cx, v); }
+        let i = 0u, fns = [];
+        let arg_ts = ty::ty_fn_args(cx.tcx, ty::expr_ty(cx.tcx, f));
+        for arg in args {
+            alt arg.node {
+              expr_fn(_) { fns += [arg]; }
+              _ {
+                alt arg_ts[i].mode {
+                  by_mut_ref. { clear_if_path(cx, arg, v, false); }
+                  _ { v.visit_expr(arg, cx, v); }
+                }
+              }
             }
             i += 1u;
         }
+        for f in fns { v.visit_expr(f, cx, v); }
       }
       _ { visit::visit_expr(ex, cx, v); }
     }