Move /src/test to /tests

tests/ui/iterators/iter-count-overflow-debug.rs

@@ -0,0 +1,15 @@
+// run-pass
+// only-32bit too impatient for 2⁶⁴ items
+// needs-unwind
+// compile-flags: -C debug_assertions=yes -C opt-level=3
+
+use std::panic;
+
+fn main() {
+    assert_eq!((0..usize::MAX).by_ref().count(), usize::MAX);
+
+    let r = panic::catch_unwind(|| {
+        (0..=usize::MAX).by_ref().count()
+    });
+    assert!(r.is_err());
+}