rust-clippy/tests/ui/blocks_in_if_conditions_closure.rs

#![warn(clippy::blocks_in_if_conditions)]
#![allow(
    unused,
    clippy::let_and_return,
    clippy::needless_if,
    clippy::unnecessary_literal_unwrap
)]

fn predicate<F: FnOnce(T) -> bool, T>(pfn: F, val: T) -> bool {
    pfn(val)
}

fn pred_test() {
    let v = 3;
    let sky = "blue";
    // This is a sneaky case, where the block isn't directly in the condition,
    // but is actually inside a closure that the condition is using.
    // The same principle applies -- add some extra expressions to make sure
    // linter isn't confused by them.
    if v == 3
        && sky == "blue"
        && predicate(
            |x| {
                //~^ ERROR: in an `if` condition, avoid complex blocks or closures with blocks
                //~| NOTE: `-D clippy::blocks-in-if-conditions` implied by `-D warnings`
                let target = 3;
                x == target
            },
            v,
        )
    {}

    if predicate(
        |x| {
            //~^ ERROR: in an `if` condition, avoid complex blocks or closures with blocks; in
            let target = 3;
            x == target
        },
        v,
    ) {}
}

fn closure_without_block() {
    if predicate(|x| x == 3, 6) {}
}

fn macro_in_closure() {
    let option = Some(true);

    if option.unwrap_or_else(|| unimplemented!()) {
        unimplemented!()
    }
}

fn closure(_: impl FnMut()) -> bool {
    true
}

fn function_with_empty_closure() {
    if closure(|| {}) {}
}

#[rustfmt::skip]
fn main() {
    let mut range = 0..10;
    range.all(|i| {i < 10} );

    let v = vec![1, 2, 3];
    if v.into_iter().any(|x| {x == 4}) {
        println!("contains 4!");
    }
}