diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/from_iter_instead_of_collect.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/from_iter_instead_of_collect.rs | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/from_iter_instead_of_collect.rs b/src/tools/clippy/tests/ui/from_iter_instead_of_collect.rs new file mode 100644 index 000000000..ebe0ad278 --- /dev/null +++ b/src/tools/clippy/tests/ui/from_iter_instead_of_collect.rs @@ -0,0 +1,61 @@ +// run-rustfix + +#![warn(clippy::from_iter_instead_of_collect)] +#![allow(unused_imports, unused_tuple_struct_fields)] + +use std::collections::{BTreeMap, BTreeSet, HashMap, VecDeque}; + +struct Foo(Vec<bool>); + +impl FromIterator<bool> for Foo { + fn from_iter<T: IntoIterator<Item = bool>>(_: T) -> Self { + todo!() + } +} + +impl<'a> FromIterator<&'a bool> for Foo { + fn from_iter<T: IntoIterator<Item = &'a bool>>(iter: T) -> Self { + <Self as FromIterator<bool>>::from_iter(iter.into_iter().copied()) + } +} + +fn main() { + let iter_expr = std::iter::repeat(5).take(5); + let _ = Vec::from_iter(iter_expr); + + let _ = HashMap::<usize, &i8>::from_iter(vec![5, 5, 5, 5].iter().enumerate()); + + Vec::from_iter(vec![42u32]); + + let a = vec![0, 1, 2]; + assert_eq!(a, Vec::from_iter(0..3)); + assert_eq!(a, Vec::<i32>::from_iter(0..3)); + + let mut b = VecDeque::from_iter(0..3); + b.push_back(4); + + let mut b = VecDeque::<i32>::from_iter(0..3); + b.push_back(4); + + { + use std::collections; + let mut b = collections::VecDeque::<i32>::from_iter(0..3); + b.push_back(4); + } + + let values = [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')]; + let bm = BTreeMap::from_iter(values.iter().cloned()); + let mut bar = BTreeMap::from_iter(bm.range(0..2)); + bar.insert(&4, &'e'); + + let mut bts = BTreeSet::from_iter(0..3); + bts.insert(2); + { + use std::collections; + let _ = collections::BTreeSet::from_iter(0..3); + let _ = collections::BTreeSet::<u32>::from_iter(0..3); + } + + for _i in Vec::from_iter([1, 2, 3].iter()) {} + for _i in Vec::<&i32>::from_iter([1, 2, 3].iter()) {} +} |