```
/home/rusty/devel/cvs/ccan/ccan/idtree/test/run-wrap.c:/home/rusty/devel/cvs/ccan/ccan/idtree/idtree.c:76:21: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>