diff options
Diffstat (limited to 'tests/ui/lint/lint_map_unit_fn.rs')
-rw-r--r-- | tests/ui/lint/lint_map_unit_fn.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/lint/lint_map_unit_fn.rs b/tests/ui/lint/lint_map_unit_fn.rs new file mode 100644 index 000000000..dc1ecbf84 --- /dev/null +++ b/tests/ui/lint/lint_map_unit_fn.rs @@ -0,0 +1,20 @@ +#![deny(map_unit_fn)] + +fn foo(items: &mut Vec<u8>) { + items.sort(); +} + +fn main() { + let mut x: Vec<Vec<u8>> = vec![vec![0, 2, 1], vec![5, 4, 3]]; + x.iter_mut().map(foo); + //~^ ERROR `Iterator::map` call that discard the iterator's values + x.iter_mut().map(|items| { + //~^ ERROR `Iterator::map` call that discard the iterator's values + items.sort(); + }); + let f = |items: &mut Vec<u8>| { + items.sort(); + }; + x.iter_mut().map(f); + //~^ ERROR `Iterator::map` call that discard the iterator's values +} |