next / bitvector_next gets stuck with IntSet, causing infinite loop

[danluu]

julia> s = IntSet(2^32);

julia> length(s)
1

julia> for b in s; println(b); end
0
0
0
0
0
0
0
0
^CERROR: interrupt

julia> show(s)
IntSet([0, 0, 0, 0, 0, 0, 0, 0, 0^CERROR: interrupt

It's possible that doing #3039 will also fix this?

[JeffBezanson]

Here's a patch; don't have time to write a test and commit right now:

diff --git a/src/support/bitvector.c b/src/support/bitvector.c
index 5742ac1..9f78dff 100644
--- a/src/support/bitvector.c
+++ b/src/support/bitvector.c
@@ -118,7 +118,7 @@ uint64_t bitvector_next(uint32_t *b, uint64_t n0, uint64_t n
     while (i < nw-1) {
         w = b[i];
         if (w != 0) {
-            return ntz(w) + (i<<5);
+            return ntz(w) + (((uint64_t)i)<<5);
         }
         i++;
     }