| // MIR for `step_forward` after PreCodegen |
| |
| fn step_forward(_1: u32, _2: usize) -> u32 { |
| debug x => _1; |
| debug n => _2; |
| let mut _0: u32; |
| scope 1 (inlined <u32 as Step>::forward) { |
| debug start => _1; |
| debug n => _2; |
| let _3: std::option::Option<u32>; |
| let mut _4: &std::option::Option<u32>; |
| let mut _7: bool; |
| let mut _8: u32; |
| scope 2 { |
| } |
| scope 3 (inlined Option::<u32>::is_none) { |
| debug self => _4; |
| let mut _6: bool; |
| scope 4 (inlined Option::<u32>::is_some) { |
| debug self => _4; |
| let mut _5: isize; |
| } |
| } |
| scope 5 (inlined core::num::<impl u32>::wrapping_add) { |
| debug self => _1; |
| debug rhs => _8; |
| } |
| } |
| |
| bb0: { |
| StorageLive(_7); |
| StorageLive(_4); |
| StorageLive(_3); |
| _3 = <u32 as Step>::forward_checked(_1, _2) -> [return: bb1, unwind continue]; |
| } |
| |
| bb1: { |
| _4 = &_3; |
| StorageLive(_6); |
| StorageLive(_5); |
| _5 = discriminant(_3); |
| _6 = Eq(_5, const 1_isize); |
| StorageDead(_5); |
| _7 = Not(move _6); |
| StorageDead(_6); |
| switchInt(move _7) -> [0: bb2, otherwise: bb3]; |
| } |
| |
| bb2: { |
| StorageDead(_3); |
| StorageDead(_4); |
| goto -> bb4; |
| } |
| |
| bb3: { |
| StorageDead(_3); |
| StorageDead(_4); |
| assert(!const true, "attempt to compute `{} + {}`, which would overflow", const _, const 1_u32) -> [success: bb4, unwind continue]; |
| } |
| |
| bb4: { |
| StorageDead(_7); |
| StorageLive(_8); |
| _8 = _2 as u32 (IntToInt); |
| _0 = Add(_1, _8); |
| StorageDead(_8); |
| return; |
| } |
| } |