correct the test if IntervalSet

Author: SparrowLii

compiler/rustc_index/src/interval/tests.rs

@@ -2,7 +2,7 @@ use super::*;
 
 #[test]
 fn insert_collapses() {
-    let mut set = IntervalSet::<u32>::new(3000);
+    let mut set = IntervalSet::<u32>::new(10000);
     set.insert_range(9831..=9837);
     set.insert_range(43..=9830);
     assert_eq!(set.iter_intervals().collect::<Vec<_>>(), [43..9838]);