rust-clippy/tests/ui/from_iter_instead_of_collect.fixed

#![warn(clippy::from_iter_instead_of_collect)]
#![allow(unused_imports)]
#![allow(clippy::useless_vec)]

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 {
        iter.into_iter().copied().collect::<Self>()
    }
}

fn main() {
    let iter_expr = std::iter::repeat(5).take(5);
    let _ = iter_expr.collect::<Vec<_>>();

    let _ = vec![5, 5, 5, 5].iter().enumerate().collect::<HashMap<usize, &i8>>();

    Vec::from_iter(vec![42u32]);

    let a = vec![0, 1, 2];
    assert_eq!(a, (0..3).collect::<Vec<_>>());
    assert_eq!(a, (0..3).collect::<Vec<i32>>());

    let mut b = (0..3).collect::<VecDeque<_>>();
    b.push_back(4);

    let mut b = (0..3).collect::<VecDeque<i32>>();
    b.push_back(4);

    {
        use std::collections;
        let mut b = (0..3).collect::<collections::VecDeque<i32>>();
        b.push_back(4);
    }

    let values = [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')];
    let bm = values.iter().cloned().collect::<BTreeMap<_, _>>();
    let mut bar = bm.range(0..2).collect::<BTreeMap<_, _>>();
    bar.insert(&4, &'e');

    let mut bts = (0..3).collect::<BTreeSet<_>>();
    bts.insert(2);
    {
        use std::collections;
        let _ = (0..3).collect::<collections::BTreeSet<_>>();
        let _ = (0..3).collect::<collections::BTreeSet<u32>>();
    }

    for _i in [1, 2, 3].iter().collect::<Vec<_>>() {}
    for _i in [1, 2, 3].iter().collect::<Vec<&i32>>() {}
}