src/test/ui/iterators/iter-count-overflow-debug.rs

   1 // run-pass
   2 // only-32bit too impatient for 2⁶⁴ items
   3 // needs-unwind
   4 // compile-flags: -C debug_assertions=yes -C opt-level=3
   5
   6 use std::panic;
   7
   8 fn main() {
   9     assert_eq!((0..usize::MAX).by_ref().count(), usize::MAX);
  10
  11     let r = panic::catch_unwind(|| {
  12         (0..=usize::MAX).by_ref().count()
  13     });
  14     assert!(r.is_err());
  15 }