Fix rust_vec constructor assertion failure caused by slow path of upcall_vec_grow. Add testcase.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/test/run-pass/vec-append.rs b/src/test/run-pass/vec-append.rs
index 4324ee25..e52c6283 100644
--- a/src/test/run-pass/vec-append.rs
+++ b/src/test/run-pass/vec-append.rs
@@ -1,10 +1,25 @@
 // -*- rust -*-
 
-fn main() {
+fn fast_growth() {
   let vec[int] v = vec(1,2,3,4,5);
   v += vec(6,7,8,9,0);
+
   log v.(9);
   check(v.(0) == 1);
   check(v.(7) == 8);
   check(v.(9) == 0);
 }
+
+fn slow_growth() {
+  let vec[int] v = vec();
+  let vec[int] u = v;
+  v += vec(17);
+
+  log v.(0);
+  check (v.(0) == 17);
+}
+
+fn main() {
+  fast_growth();
+  slow_growth();
+}