// MIR for `forward_loop` after PreCodegen

fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
    debug start => _1;
    debug end => _2;
    debug f => _3;
    let mut _0: ();
    let mut _4: u32;
    let mut _9: std::option::Option<u32>;
    let mut _11: &impl Fn(u32);
    let mut _12: (u32,);
    let _13: ();
    scope 1 {
        debug ((iter: std::ops::Range<u32>).0: u32) => _4;
        debug ((iter: std::ops::Range<u32>).1: u32) => _2;
        let _10: u32;
        scope 2 {
            debug x => _10;
        }
        scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) {
            scope 5 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
                let mut _6: bool;
                let _7: u32;
                let mut _8: u32;
                scope 6 {
                }
                scope 7 (inlined std::cmp::impls::<impl PartialOrd for u32>::lt) {
                    let mut _5: u32;
                }
            }
        }
    }
    scope 3 (inlined <std::ops::Range<u32> as IntoIterator>::into_iter) {
    }

    bb0: {
        StorageLive(_4);
        _4 = copy _1;
        goto -> bb1;
    }

    bb1: {
        StorageLive(_9);
        StorageLive(_7);
        StorageLive(_6);
        StorageLive(_5);
        _5 = copy _4;
        _6 = Lt(move _5, copy _2);
        StorageDead(_5);
        switchInt(move _6) -> [0: bb2, otherwise: bb4];
    }

    bb2: {
        StorageDead(_6);
        StorageDead(_7);
        StorageDead(_9);
        StorageDead(_4);
        drop(_3) -> [return: bb3, unwind unreachable];
    }

    bb3: {
        return;
    }

    bb4: {
        _7 = copy _4;
        StorageLive(_8);
        _8 = <u32 as Step>::forward_unchecked(copy _7, const 1_usize) -> [return: bb5, unwind unreachable];
    }

    bb5: {
        _4 = move _8;
        StorageDead(_8);
        _9 = Option::<u32>::Some(copy _7);
        StorageDead(_6);
        StorageDead(_7);
        _10 = copy ((_9 as Some).0: u32);
        StorageLive(_11);
        _11 = &_3;
        StorageLive(_12);
        _12 = (copy _10,);
        _13 = <impl Fn(u32) as Fn<(u32,)>>::call(move _11, move _12) -> [return: bb6, unwind unreachable];
    }

    bb6: {
        StorageDead(_12);
        StorageDead(_11);
        StorageDead(_9);
        goto -> bb1;
    }
}