Add a debug_assert to Vec::set_len

scottmcm · scottmcm · commit 1fd971c3b97b · 2019-01-13T22:40:25.000-08:00
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
@@ -819,6 +819,8 @@ impl<T> Vec<T> {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub unsafe fn set_len(&mut self, new_len: usize) {
+        debug_assert!(new_len <= self.capacity());
+
         self.len = new_len;
     }
 

Original file line number	Diff line number	Diff line change
`@@ -819,6 +819,8 @@ impl<T> Vec<T> {`
`819`	`819`	`#[inline]`
`820`	`820`	`#[stable(feature = "rust1", since = "1.0.0")]`
`821`	`821`	`pub unsafe fn set_len(&mut self, new_len: usize) {`
	`822`	`+ debug_assert!(new_len <= self.capacity());`
	`823`	`+`
`822`	`824`	`self.len = new_len;`
`823`	`825`	`}`
`824`	`826`