rust/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.mir

// MIR for `forward_loop` after PreCodegen

fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
    debug start => _1;                   // in scope 0 at $DIR/range_iter.rs:+0:21: +0:26
    debug end => _2;                     // in scope 0 at $DIR/range_iter.rs:+0:33: +0:36
    debug f => _3;                       // in scope 0 at $DIR/range_iter.rs:+0:43: +0:44
    let mut _0: ();                      // return place in scope 0 at $DIR/range_iter.rs:+0:60: +0:60
    let mut _4: std::ops::Range<u32>;    // in scope 0 at $DIR/range_iter.rs:+1:14: +1:24
    let mut _5: std::ops::Range<u32>;    // in scope 0 at $DIR/range_iter.rs:+1:14: +1:24
    let _6: ();                          // in scope 0 at $DIR/range_iter.rs:+1:14: +1:24
    let mut _7: std::option::Option<u32>; // in scope 0 at $DIR/range_iter.rs:+1:14: +1:24
    let mut _8: &mut std::ops::Range<u32>; // in scope 0 at $DIR/range_iter.rs:+1:14: +1:24
    let mut _9: isize;                   // in scope 0 at $DIR/range_iter.rs:+1:5: +3:6
    let mut _11: &impl Fn(u32);          // in scope 0 at $DIR/range_iter.rs:+2:9: +2:10
    let mut _12: (u32,);                 // in scope 0 at $DIR/range_iter.rs:+2:9: +2:13
    scope 1 {
        debug iter => _5;                // in scope 1 at $DIR/range_iter.rs:+1:14: +1:24
        let _10: u32;                    // in scope 1 at $DIR/range_iter.rs:+1:9: +1:10
        scope 2 {
            debug x => _10;              // in scope 2 at $DIR/range_iter.rs:+1:9: +1:10
        }
        scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) { // at $DIR/range_iter.rs:21:14: 21:24
            debug self => _8;            // in scope 4 at $SRC_DIR/core/src/iter/range.rs:LL:COL
        }
    }
    scope 3 (inlined <std::ops::Range<u32> as IntoIterator>::into_iter) { // at $DIR/range_iter.rs:21:14: 21:24
        debug self => _4;                // in scope 3 at $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
    }

    bb0: {
        _4 = std::ops::Range::<u32> { start: _1, end: _2 }; // scope 0 at $DIR/range_iter.rs:+1:14: +1:24
        StorageLive(_5);                 // scope 0 at $DIR/range_iter.rs:+1:14: +1:24
        _5 = move _4;                    // scope 0 at $DIR/range_iter.rs:+1:14: +1:24
        goto -> bb1;                     // scope 1 at $DIR/range_iter.rs:+1:5: +3:6
    }

    bb1: {
        StorageLive(_7);                 // scope 1 at $DIR/range_iter.rs:+1:14: +1:24
        _8 = &mut _5;                    // scope 1 at $DIR/range_iter.rs:+1:14: +1:24
        _7 = <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next(_8) -> [return: bb9, unwind: bb7]; // scope 4 at $SRC_DIR/core/src/iter/range.rs:LL:COL
                                         // mir::Constant
                                         // + span: $SRC_DIR/core/src/iter/range.rs:LL:COL
                                         // + literal: Const { ty: for<'a> fn(&'a mut std::ops::Range<u32>) -> Option<<std::ops::Range<u32> as iter::range::RangeIteratorImpl>::Item> {<std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next}, val: Value(<ZST>) }
    }

    bb2: {
        _10 = ((_7 as Some).0: u32);     // scope 1 at $DIR/range_iter.rs:+1:9: +1:10
        StorageLive(_11);                // scope 2 at $DIR/range_iter.rs:+2:9: +2:10
        _11 = &_3;                       // scope 2 at $DIR/range_iter.rs:+2:9: +2:10
        StorageLive(_12);                // scope 2 at $DIR/range_iter.rs:+2:9: +2:13
        _12 = (_10,);                    // scope 2 at $DIR/range_iter.rs:+2:9: +2:13
        _6 = <impl Fn(u32) as Fn<(u32,)>>::call(move _11, move _12) -> [return: bb5, unwind: bb7]; // scope 2 at $DIR/range_iter.rs:+2:9: +2:13
                                         // mir::Constant
                                         // + span: $DIR/range_iter.rs:22:9: 22:10
                                         // + literal: Const { ty: for<'a> extern "rust-call" fn(&'a impl Fn(u32), (u32,)) -> <impl Fn(u32) as FnOnce<(u32,)>>::Output {<impl Fn(u32) as Fn<(u32,)>>::call}, val: Value(<ZST>) }
    }

    bb3: {
        unreachable;                     // scope 1 at $DIR/range_iter.rs:+1:14: +1:24
    }

    bb4: {
        StorageDead(_7);                 // scope 1 at $DIR/range_iter.rs:+3:5: +3:6
        StorageDead(_5);                 // scope 0 at $DIR/range_iter.rs:+3:5: +3:6
        drop(_3) -> bb6;                 // scope 0 at $DIR/range_iter.rs:+4:1: +4:2
    }

    bb5: {
        StorageDead(_12);                // scope 2 at $DIR/range_iter.rs:+2:12: +2:13
        StorageDead(_11);                // scope 2 at $DIR/range_iter.rs:+2:12: +2:13
        StorageDead(_7);                 // scope 1 at $DIR/range_iter.rs:+3:5: +3:6
        goto -> bb1;                     // scope 1 at $DIR/range_iter.rs:+1:5: +3:6
    }

    bb6: {
        return;                          // scope 0 at $DIR/range_iter.rs:+4:2: +4:2
    }

    bb7 (cleanup): {
        drop(_3) -> [return: bb8, unwind terminate]; // scope 0 at $DIR/range_iter.rs:+4:1: +4:2
    }

    bb8 (cleanup): {
        resume;                          // scope 0 at $DIR/range_iter.rs:+0:1: +4:2
    }

    bb9: {
        _9 = discriminant(_7);           // scope 1 at $DIR/range_iter.rs:+1:14: +1:24
        switchInt(move _9) -> [0: bb4, 1: bb2, otherwise: bb3]; // scope 1 at $DIR/range_iter.rs:+1:14: +1:24
    }
}