diff options
Diffstat (limited to 'src/liballoc/vec.rs')
| -rw-r--r-- | src/liballoc/vec.rs | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs index 35d0a69a05a..690cbcb559b 100644 --- a/src/liballoc/vec.rs +++ b/src/liballoc/vec.rs @@ -2533,9 +2533,11 @@ impl<'a, T> Drop for Drain<'a, T> { // memmove back untouched tail, update to new length let start = source_vec.len(); let tail = self.tail_start; - let src = source_vec.as_ptr().offset(tail as isize); - let dst = source_vec.as_mut_ptr().offset(start as isize); - ptr::copy(src, dst, self.tail_len); + if tail != start { + let src = source_vec.as_ptr().offset(tail as isize); + let dst = source_vec.as_mut_ptr().offset(start as isize); + ptr::copy(src, dst, self.tail_len); + } source_vec.set_len(start + self.tail_len); } } |