rust/src/test/run-pass/discrim-explicit-23030.rs

// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Issue 23030: Workaround overflowing discriminant
// with explicit assignments.

// See also compile-fail/overflow-discrim.rs, which shows what
// happens if you leave the OhNo explicit cases out here.

use std::{i8,u8,i16,u16,i32,u32,i64,u64,isize,usize};

fn f_i8() {
    #[repr(i8)]
    enum A {
        Ok = i8::MAX - 1,
        Ok2,
        OhNo = i8::MIN,
        NotTheEnd = -1,
        Zero,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
    let z = (A::NotTheEnd, A::Zero).1 as i8;
    assert_eq!(z, 0);
}

fn f_u8() {
    #[repr(u8)]
    enum A {
        Ok = u8::MAX - 1,
        Ok2,
        OhNo = u8::MIN,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
}

fn f_i16() {
    #[repr(i16)]
    enum A {
        Ok = i16::MAX - 1,
        Ok2,
        OhNo = i16::MIN,
        NotTheEnd = -1,
        Zero,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
    let z = (A::NotTheEnd, A::Zero).1 as i16;
    assert_eq!(z, 0);
}

fn f_u16() {
    #[repr(u16)]
    enum A {
        Ok = u16::MAX - 1,
        Ok2,
        OhNo = u16::MIN,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
}

fn f_i32() {
    #[repr(i32)]
    enum A {
        Ok = i32::MAX - 1,
        Ok2,
        OhNo = i32::MIN,
        NotTheEnd = -1,
        Zero,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
    let z = (A::NotTheEnd, A::Zero).1 as i32;
    assert_eq!(z, 0);
}

fn f_u32() {
    #[repr(u32)]
    enum A {
        Ok = u32::MAX - 1,
        Ok2,
        OhNo = u32::MIN,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
}

fn f_i64() {
    #[repr(i64)]
    enum A {
        Ok = i64::MAX - 1,
        Ok2,
        OhNo = i64::MIN,
        NotTheEnd = -1,
        Zero,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
    let z = (A::NotTheEnd, A::Zero).1 as i64;
    assert_eq!(z, 0);
}

fn f_u64() {
    #[repr(u64)]
    enum A {
        Ok = u64::MAX - 1,
        Ok2,
        OhNo = u64::MIN,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
}

fn f_isize() {
    #[repr(isize)]
    enum A {
        Ok = isize::MAX - 1,
        Ok2,
        OhNo = isize::MIN,
        NotTheEnd = -1,
        Zero,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
    let z = (A::NotTheEnd, A::Zero).1 as isize;
    assert_eq!(z, 0);
}

fn f_usize() {
    #[repr(usize)]
    enum A {
        Ok = usize::MAX - 1,
        Ok2,
        OhNo = usize::MIN,
    }

    let _x = (A::Ok, A::Ok2, A::OhNo);
}

fn main() {
    f_i8(); f_u8();
    f_i16(); f_u16();
    f_i32(); f_u32();
    f_i64(); f_u64();

    f_isize(); f_usize();
}