id.rs

#![crate_type="lib"]

#[no_mangle]
pub fn id_option(a: Option<u32>) -> Option<u32> {
    match a {
        Some(x) => Some(x),
        None => None,
    }
}

#[no_mangle]
pub fn id_result(a: Result<u32, i32>) -> Result<u32, i32> {
    match a {
        Ok(x) => Ok(x),
        Err(y) => Err(y),
    }
}

rustc.node22.Deaggregator.after.mir

// MIR for `id_result`
// node_id = 22
// pass_name = Deaggregator
// disambiguator = after

fn id_result(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
    let mut _0: std::result::Result<u32, i32>; // return pointer
    scope 1 {
        let _2: std::result::Result<u32, i32>; // "a" in scope 1 at id.rs:12:18: 12:19
        scope 2 {
            let _3: u32;                 // "x" in scope 2 at id.rs:14:12: 14:13
        }
        scope 3 {
            let _4: i32;                 // "y" in scope 3 at id.rs:15:13: 15:14
        }
    }
    let mut _5: u32;
    let mut _6: i32;

    bb0: {
        StorageLive(_2);                 // scope 0 at id.rs:12:18: 12:19
        _2 = _1;                         // scope 0 at id.rs:12:18: 12:19
        switch(_2) -> [Ok: bb1, Err: bb2]; // scope 1 at id.rs:14:9: 14:14
    }

    bb1: {
        StorageLive(_3);                 // scope 1 at id.rs:14:12: 14:13
        _3 = ((_2 as Ok).0: u32);        // scope 1 at id.rs:14:12: 14:13
        StorageLive(_5);                 // scope 2 at id.rs:14:21: 14:22
        _5 = _3;                         // scope 2 at id.rs:14:21: 14:22
        ((_0 as Ok).0: u32) = _5;        // scope 2 at id.rs:14:18: 14:23
        discriminant(_0) = 0;            // scope 2 at id.rs:14:18: 14:23
        StorageDead(_5);                 // scope 2 at id.rs:14:23: 14:23
        goto -> bb3;                     // scope 1 at id.rs:13:5: 16:6
    }

    bb2: {
        StorageLive(_4);                 // scope 1 at id.rs:15:13: 15:14
        _4 = ((_2 as Err).0: i32);       // scope 1 at id.rs:15:13: 15:14
        StorageLive(_6);                 // scope 3 at id.rs:15:23: 15:24
        _6 = _4;                         // scope 3 at id.rs:15:23: 15:24
        _0 = std::result::Result<u32, i32>::Err(_6,); // scope 3 at id.rs:15:19: 15:25
        StorageDead(_6);                 // scope 3 at id.rs:15:25: 15:25
        goto -> bb3;                     // scope 1 at id.rs:13:5: 16:6
    }

    bb3: {
        StorageDead(_4);                 // scope 1 at id.rs:16:6: 16:6
        StorageDead(_3);                 // scope 1 at id.rs:16:6: 16:6
        StorageDead(_2);                 // scope 0 at id.rs:17:2: 17:2
        return;                          // scope 1 at id.rs:17:2: 17:2
    }
}

rustc.node22.Deaggregator.before.mir

// MIR for `id_result`
// node_id = 22
// pass_name = Deaggregator
// disambiguator = before

fn id_result(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
    let mut _0: std::result::Result<u32, i32>; // return pointer
    scope 1 {
        let _2: std::result::Result<u32, i32>; // "a" in scope 1 at id.rs:12:18: 12:19
        scope 2 {
            let _3: u32;                 // "x" in scope 2 at id.rs:14:12: 14:13
        }
        scope 3 {
            let _4: i32;                 // "y" in scope 3 at id.rs:15:13: 15:14
        }
    }
    let mut _5: u32;
    let mut _6: i32;

    bb0: {
        StorageLive(_2);                 // scope 0 at id.rs:12:18: 12:19
        _2 = _1;                         // scope 0 at id.rs:12:18: 12:19
        switch(_2) -> [Ok: bb1, Err: bb2]; // scope 1 at id.rs:14:9: 14:14
    }

    bb1: {
        StorageLive(_3);                 // scope 1 at id.rs:14:12: 14:13
        _3 = ((_2 as Ok).0: u32);        // scope 1 at id.rs:14:12: 14:13
        StorageLive(_5);                 // scope 2 at id.rs:14:21: 14:22
        _5 = _3;                         // scope 2 at id.rs:14:21: 14:22
        _0 = std::result::Result<u32, i32>::Ok(_5,); // scope 2 at id.rs:14:18: 14:23
        StorageDead(_5);                 // scope 2 at id.rs:14:23: 14:23
        goto -> bb3;                     // scope 1 at id.rs:13:5: 16:6
    }

    bb2: {
        StorageLive(_4);                 // scope 1 at id.rs:15:13: 15:14
        _4 = ((_2 as Err).0: i32);       // scope 1 at id.rs:15:13: 15:14
        StorageLive(_6);                 // scope 3 at id.rs:15:23: 15:24
        _6 = _4;                         // scope 3 at id.rs:15:23: 15:24
        _0 = std::result::Result<u32, i32>::Err(_6,); // scope 3 at id.rs:15:19: 15:25
        StorageDead(_6);                 // scope 3 at id.rs:15:25: 15:25
        goto -> bb3;                     // scope 1 at id.rs:13:5: 16:6
    }

    bb3: {
        StorageDead(_4);                 // scope 1 at id.rs:16:6: 16:6
        StorageDead(_3);                 // scope 1 at id.rs:16:6: 16:6
        StorageDead(_2);                 // scope 0 at id.rs:17:2: 17:2
        return;                          // scope 1 at id.rs:17:2: 17:2
    }
}