diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/unnecessary_fold.rs')
| -rw-r--r-- | src/tools/clippy/tests/ui/unnecessary_fold.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/unnecessary_fold.rs b/src/tools/clippy/tests/ui/unnecessary_fold.rs index a3cec8ea3..d27cc460c 100644 --- a/src/tools/clippy/tests/ui/unnecessary_fold.rs +++ b/src/tools/clippy/tests/ui/unnecessary_fold.rs @@ -49,4 +49,28 @@ fn unnecessary_fold_over_multiple_lines() { .fold(false, |acc, x| acc || x > 2); } +fn issue10000() { + use std::collections::HashMap; + use std::hash::BuildHasher; + + fn anything<T>(_: T) {} + fn num(_: i32) {} + fn smoketest_map<S: BuildHasher>(mut map: HashMap<i32, i32, S>) { + map.insert(0, 0); + assert_eq!(map.values().fold(0, |x, y| x + y), 0); + + // more cases: + let _ = map.values().fold(0, |x, y| x + y); + let _ = map.values().fold(1, |x, y| x * y); + let _: i32 = map.values().fold(0, |x, y| x + y); + let _: i32 = map.values().fold(1, |x, y| x * y); + anything(map.values().fold(0, |x, y| x + y)); + anything(map.values().fold(1, |x, y| x * y)); + num(map.values().fold(0, |x, y| x + y)); + num(map.values().fold(1, |x, y| x * y)); + } + + smoketest_map(HashMap::new()); +} + fn main() {} |