// MIR for `int_range` after PreCodegen

fn int_range(_1: usize, _2: usize) -> () {
    debug start => _1;                   // in scope 0 at $DIR/loops.rs:+0:18: +0:23
    debug end => _2;                     // in scope 0 at $DIR/loops.rs:+0:32: +0:35
    let mut _0: ();                      // return place in scope 0 at $DIR/loops.rs:+0:44: +0:44
    let mut _3: std::ops::Range<usize>;  // in scope 0 at $DIR/loops.rs:+1:14: +1:24
    let mut _4: std::ops::Range<usize>;  // in scope 0 at $DIR/loops.rs:+1:14: +1:24
    let mut _5: &mut std::ops::Range<usize>; // in scope 0 at $DIR/loops.rs:+1:14: +1:24
    let mut _6: std::option::Option<usize>; // in scope 0 at $DIR/loops.rs:+1:14: +1:24
    let mut _7: isize;                   // in scope 0 at $DIR/loops.rs:+1:5: +3:6
    let _9: ();                          // in scope 0 at $DIR/loops.rs:+1:14: +1:24
    scope 1 {
        debug iter => _4;                // in scope 1 at $DIR/loops.rs:+1:14: +1:24
        let _8: usize;                   // in scope 1 at $DIR/loops.rs:+1:9: +1:10
        scope 2 {
            debug i => _8;               // in scope 2 at $DIR/loops.rs:+1:9: +1:10
        }
        scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) { // at $DIR/loops.rs:8:14: 8:24
            debug self => _5;            // in scope 4 at $SRC_DIR/core/src/iter/range.rs:LL:COL
        }
    }
    scope 3 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) { // at $DIR/loops.rs:8:14: 8:24
        debug self => _3;                // in scope 3 at $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
    }

    bb0: {
        _3 = std::ops::Range::<usize> { start: _1, end: _2 }; // scope 0 at $DIR/loops.rs:+1:14: +1:24
        StorageLive(_4);                 // scope 0 at $DIR/loops.rs:+1:14: +1:24
        _4 = move _3;                    // scope 0 at $DIR/loops.rs:+1:14: +1:24
        goto -> bb1;                     // scope 1 at $DIR/loops.rs:+1:5: +3:6
    }

    bb1: {
        StorageLive(_6);                 // scope 1 at $DIR/loops.rs:+1:14: +1:24
        _5 = &mut _4;                    // scope 1 at $DIR/loops.rs:+1:14: +1:24
        _6 = <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next(_5) -> bb2; // 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<usize>) -> Option<<std::ops::Range<usize> as iter::range::RangeIteratorImpl>::Item> {<std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next}, val: Value(<ZST>) }
    }

    bb2: {
        _7 = discriminant(_6);           // scope 1 at $DIR/loops.rs:+1:14: +1:24
        switchInt(move _7) -> [0: bb3, 1: bb4, otherwise: bb6]; // scope 1 at $DIR/loops.rs:+1:14: +1:24
    }

    bb3: {
        StorageDead(_6);                 // scope 1 at $DIR/loops.rs:+3:5: +3:6
        StorageDead(_4);                 // scope 0 at $DIR/loops.rs:+3:5: +3:6
        return;                          // scope 0 at $DIR/loops.rs:+4:2: +4:2
    }

    bb4: {
        _8 = ((_6 as Some).0: usize);    // scope 1 at $DIR/loops.rs:+1:9: +1:10
        _9 = opaque::<usize>(_8) -> bb5; // scope 2 at $DIR/loops.rs:+2:9: +2:18
                                         // mir::Constant
                                         // + span: $DIR/loops.rs:9:9: 9:15
                                         // + literal: Const { ty: fn(usize) {opaque::<usize>}, val: Value(<ZST>) }
    }

    bb5: {
        StorageDead(_6);                 // scope 1 at $DIR/loops.rs:+3:5: +3:6
        goto -> bb1;                     // scope 1 at $DIR/loops.rs:+1:5: +3:6
    }

    bb6: {
        unreachable;                     // scope 1 at $DIR/loops.rs:+1:14: +1:24
    }
}