// MIR for `main` 0 nll

| Free Region Mapping
| '?0 | Global | ['?0, '?1]
| '?1 | Local | ['?1]
|
| Inferred Region Values
| '?0 | U0 | {bb0[0..=8], bb1[0..=7], bb2[0..=3], bb3[0..=3], bb4[0..=1], bb5[0..=2], bb6[0..=5], bb7[0], '?0, '?1}
| '?1 | U0 | {bb0[0..=8], bb1[0..=7], bb2[0..=3], bb3[0..=3], bb4[0..=1], bb5[0..=2], bb6[0..=5], bb7[0], '?1}
| '?2 | U0 | {bb1[0..=7], bb2[0..=2]}
| '?3 | U0 | {bb1[1..=7], bb2[0..=2]}
| '?4 | U0 | {bb1[4..=7], bb2[0..=2]}
|
| Inference Constraints
| '?0 live at {bb0[0..=8], bb1[0..=7], bb2[0..=3], bb3[0..=3], bb4[0..=1], bb5[0..=2], bb6[0..=5], bb7[0]}
| '?1 live at {bb0[0..=8], bb1[0..=7], bb2[0..=3], bb3[0..=3], bb4[0..=1], bb5[0..=2], bb6[0..=5], bb7[0]}
| '?2 live at {bb1[0]}
| '?3 live at {bb1[1..=3]}
| '?4 live at {bb1[4..=7], bb2[0..=2]}
| '?2: '?3 due to Assignment at Single(bb1[0]) ($DIR/region_subtyping_basic.rs:18:13: 18:18 (#0)
| '?3: '?4 due to Assignment at Single(bb1[3]) ($DIR/region_subtyping_basic.rs:19:13: 19:14 (#0)
|
fn main() -> () {
    let mut _0: ();                      // return place in scope 0 at $DIR/region_subtyping_basic.rs:+0:11: +0:11
    let mut _1: [usize; Const(Value(Leaf(0x00000003)): usize)]; // in scope 0 at $DIR/region_subtyping_basic.rs:+1:9: +1:14
    let _3: usize;                       // in scope 0 at $DIR/region_subtyping_basic.rs:+2:16: +2:17
    let mut _4: usize;                   // in scope 0 at $DIR/region_subtyping_basic.rs:+2:14: +2:18
    let mut _5: bool;                    // in scope 0 at $DIR/region_subtyping_basic.rs:+2:14: +2:18
    let mut _7: bool;                    // in scope 0 at $DIR/region_subtyping_basic.rs:+4:8: +4:12
    let _8: bool;                        // in scope 0 at $DIR/region_subtyping_basic.rs:+5:9: +5:18
    let mut _9: usize;                   // in scope 0 at $DIR/region_subtyping_basic.rs:+5:15: +5:17
    let _10: bool;                       // in scope 0 at $DIR/region_subtyping_basic.rs:+7:9: +7:18
    scope 1 {
        debug v => _1;                   // in scope 1 at $DIR/region_subtyping_basic.rs:+1:9: +1:14
        let _2: &'?3 usize;              // in scope 1 at $DIR/region_subtyping_basic.rs:+2:9: +2:10
        scope 2 {
            debug p => _2;               // in scope 2 at $DIR/region_subtyping_basic.rs:+2:9: +2:10
            let _6: &'?4 usize;          // in scope 2 at $DIR/region_subtyping_basic.rs:+3:9: +3:10
            scope 3 {
                debug q => _6;           // in scope 3 at $DIR/region_subtyping_basic.rs:+3:9: +3:10
            }
        }
    }

    bb0: {
        StorageLive(_1);                 // bb0[0]: scope 0 at $DIR/region_subtyping_basic.rs:+1:9: +1:14
        _1 = [const ConstValue(Scalar(0x00000001): usize), const ConstValue(Scalar(0x00000002): usize), const ConstValue(Scalar(0x00000003): usize)]; // bb0[1]: scope 0 at $DIR/region_subtyping_basic.rs:+1:17: +1:26
        FakeRead(ForLet(None), _1);      // bb0[2]: scope 0 at $DIR/region_subtyping_basic.rs:+1:9: +1:14
        StorageLive(_2);                 // bb0[3]: scope 1 at $DIR/region_subtyping_basic.rs:+2:9: +2:10
        StorageLive(_3);                 // bb0[4]: scope 1 at $DIR/region_subtyping_basic.rs:+2:16: +2:17
        _3 = const ConstValue(Scalar(0x00000000): usize); // bb0[5]: scope 1 at $DIR/region_subtyping_basic.rs:+2:16: +2:17
        _4 = Len(_1);                    // bb0[6]: scope 1 at $DIR/region_subtyping_basic.rs:+2:14: +2:18
        _5 = Lt(_3, _4);                 // bb0[7]: scope 1 at $DIR/region_subtyping_basic.rs:+2:14: +2:18
        assert(move _5, "index out of bounds: the length is {} but the index is {}", move _4, _3) -> [success: bb1, unwind: bb7]; // bb0[8]: scope 1 at $DIR/region_subtyping_basic.rs:+2:14: +2:18
    }

    bb1: {
        _2 = &'?2 _1[_3];                // bb1[0]: scope 1 at $DIR/region_subtyping_basic.rs:+2:13: +2:18
        FakeRead(ForLet(None), _2);      // bb1[1]: scope 1 at $DIR/region_subtyping_basic.rs:+2:9: +2:10
        StorageLive(_6);                 // bb1[2]: scope 2 at $DIR/region_subtyping_basic.rs:+3:9: +3:10
        _6 = _2;                         // bb1[3]: scope 2 at $DIR/region_subtyping_basic.rs:+3:13: +3:14
        FakeRead(ForLet(None), _6);      // bb1[4]: scope 2 at $DIR/region_subtyping_basic.rs:+3:9: +3:10
        StorageLive(_7);                 // bb1[5]: scope 3 at $DIR/region_subtyping_basic.rs:+4:8: +4:12
        _7 = const ConstValue(Scalar(0x01): bool); // bb1[6]: scope 3 at $DIR/region_subtyping_basic.rs:+4:8: +4:12
        switchInt(move _7) -> [0: bb4, otherwise: bb2]; // bb1[7]: scope 3 at $DIR/region_subtyping_basic.rs:+4:8: +4:12
    }

    bb2: {
        StorageLive(_8);                 // bb2[0]: scope 3 at $DIR/region_subtyping_basic.rs:+5:9: +5:18
        StorageLive(_9);                 // bb2[1]: scope 3 at $DIR/region_subtyping_basic.rs:+5:15: +5:17
        _9 = (*_6);                      // bb2[2]: scope 3 at $DIR/region_subtyping_basic.rs:+5:15: +5:17
        _8 = ConstValue(ZeroSized: fn(usize) -> bool {use_x})(move _9) -> [return: bb3, unwind: bb7]; // bb2[3]: scope 3 at $DIR/region_subtyping_basic.rs:+5:9: +5:18
                                         // mir::Constant
                                         // + span: $DIR/region_subtyping_basic.rs:21:9: 21:14
                                         // + literal: Const { ty: fn(usize) -> bool {use_x}, val: Value(<ZST>) }
    }

    bb3: {
        StorageDead(_9);                 // bb3[0]: scope 3 at $DIR/region_subtyping_basic.rs:+5:17: +5:18
        StorageDead(_8);                 // bb3[1]: scope 3 at $DIR/region_subtyping_basic.rs:+5:18: +5:19
        _0 = const ConstValue(ZeroSized: ()); // bb3[2]: scope 3 at $DIR/region_subtyping_basic.rs:+4:13: +6:6
        goto -> bb6;                     // bb3[3]: scope 3 at $DIR/region_subtyping_basic.rs:+4:5: +8:6
    }

    bb4: {
        StorageLive(_10);                // bb4[0]: scope 3 at $DIR/region_subtyping_basic.rs:+7:9: +7:18
        _10 = ConstValue(ZeroSized: fn(usize) -> bool {use_x})(const ConstValue(Scalar(0x00000016): usize)) -> [return: bb5, unwind: bb7]; // bb4[1]: scope 3 at $DIR/region_subtyping_basic.rs:+7:9: +7:18
                                         // mir::Constant
                                         // + span: $DIR/region_subtyping_basic.rs:23:9: 23:14
                                         // + literal: Const { ty: fn(usize) -> bool {use_x}, val: Value(<ZST>) }
    }

    bb5: {
        StorageDead(_10);                // bb5[0]: scope 3 at $DIR/region_subtyping_basic.rs:+7:18: +7:19
        _0 = const ConstValue(ZeroSized: ()); // bb5[1]: scope 3 at $DIR/region_subtyping_basic.rs:+6:12: +8:6
        goto -> bb6;                     // bb5[2]: scope 3 at $DIR/region_subtyping_basic.rs:+4:5: +8:6
    }

    bb6: {
        StorageDead(_7);                 // bb6[0]: scope 3 at $DIR/region_subtyping_basic.rs:+8:5: +8:6
        StorageDead(_6);                 // bb6[1]: scope 2 at $DIR/region_subtyping_basic.rs:+9:1: +9:2
        StorageDead(_3);                 // bb6[2]: scope 1 at $DIR/region_subtyping_basic.rs:+9:1: +9:2
        StorageDead(_2);                 // bb6[3]: scope 1 at $DIR/region_subtyping_basic.rs:+9:1: +9:2
        StorageDead(_1);                 // bb6[4]: scope 0 at $DIR/region_subtyping_basic.rs:+9:1: +9:2
        return;                          // bb6[5]: scope 0 at $DIR/region_subtyping_basic.rs:+9:2: +9:2
    }

    bb7 (cleanup): {
        resume;                          // bb7[0]: scope 0 at $DIR/region_subtyping_basic.rs:+0:1: +9:2
    }
}