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Diffstat (limited to 'src/tools/clippy/src/docs/extend_with_drain.txt')
-rw-r--r-- | src/tools/clippy/src/docs/extend_with_drain.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/extend_with_drain.txt b/src/tools/clippy/src/docs/extend_with_drain.txt new file mode 100644 index 000000000..2f31dcf5f --- /dev/null +++ b/src/tools/clippy/src/docs/extend_with_drain.txt @@ -0,0 +1,21 @@ +### What it does +Checks for occurrences where one vector gets extended instead of append + +### Why is this bad? +Using `append` instead of `extend` is more concise and faster + +### Example +``` +let mut a = vec![1, 2, 3]; +let mut b = vec![4, 5, 6]; + +a.extend(b.drain(..)); +``` + +Use instead: +``` +let mut a = vec![1, 2, 3]; +let mut b = vec![4, 5, 6]; + +a.append(&mut b); +```
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