fix the impl error in insert_all

SparrowLii · SparrowLii · commit 65a5b082bc8c · 2022-06-08T22:09:26.000+08:00
diff --git a/compiler/rustc_index/src/interval.rs b/compiler/rustc_index/src/interval.rs
@@ -203,7 +203,9 @@ impl<I: Idx> IntervalSet<I> {
 
     pub fn insert_all(&mut self) {
         self.clear();
-        self.map.push((0, self.domain.try_into().unwrap()));
+        if let Some(end) = self.domain.checked_sub(1) {
+            self.map.push((0, end.try_into().unwrap()));
+        }
         debug_assert!(self.check_invariants());
     }
 

Original file line number	Diff line number	Diff line change
`@@ -203,7 +203,9 @@ impl<I: Idx> IntervalSet<I> {`
`203`	`203`
`204`	`204`	`pub fn insert_all(&mut self) {`
`205`	`205`	`self.clear();`
`206`		`- self.map.push((0, self.domain.try_into().unwrap()));`
	`206`	`+ if let Some(end) = self.domain.checked_sub(1) {`
	`207`	`+ self.map.push((0, end.try_into().unwrap()));`
	`208`	`+ }`
`207`	`209`	`debug_assert!(self.check_invariants());`
`208`	`210`	`}`
`209`	`211`