const-eval-overflow.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.

#![allow(unused_imports)]

// Note: the relevant lint pass here runs before some of the constant
// evaluation below (e.g. that performed by trans and llvm), so if you
// change this warn to a deny, then the compiler will exit before
// those errors are detected.

#![warn(const_err)]

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

const VALS_I8: (i8, i8, i8, i8) =
    (-i8::MIN,
     //~^ ERROR constant evaluation error
     //~| attempt to negate with overflow
     i8::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     i8::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     i8::MIN * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_I16: (i16, i16, i16, i16) =
    (-i16::MIN,
     //~^ ERROR constant evaluation error
     //~| attempt to negate with overflow
     i16::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     i16::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     i16::MIN * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_I32: (i32, i32, i32, i32) =
    (-i32::MIN,
     //~^ ERROR constant evaluation error
     //~| attempt to negate with overflow
     i32::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     i32::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     i32::MIN * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_I64: (i64, i64, i64, i64) =
    (-i64::MIN,
     //~^ ERROR constant evaluation error
     //~| attempt to negate with overflow
     i64::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     i64::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     i64::MAX * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_U8: (u8, u8, u8, u8) =
    ( //~ WARN constant evaluation error: attempt to subtract with overflow
     -(u8::MIN as i8) as u8,
     u8::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     u8::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     u8::MAX * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_U16: (u16, u16, u16, u16) =
    ( //~ WARN constant evaluation error: attempt to subtract with overflow
     -(u16::MIN as i16) as u16,
     u16::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     u16::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     u16::MAX * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_U32: (u32, u32, u32, u32) =
    ( //~ WARN constant evaluation error: attempt to subtract with overflow
     -(u32::MIN as i32) as u32,
     u32::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     u32::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     u32::MAX * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

const VALS_U64: (u64, u64, u64, u64) =
    ( //~ WARN constant evaluation error: attempt to subtract with overflow
     -(u64::MIN as i64) as u64,
     u64::MIN - 1,
     //~^ ERROR constant evaluation error
     //~| attempt to subtract with overflow
     u64::MAX + 1,
     //~^ ERROR constant evaluation error
     //~| attempt to add with overflow
     u64::MAX * 2,
     //~^ ERROR constant evaluation error
     //~| attempt to multiply with overflow
     );

fn main() {
    foo(VALS_I8);
    foo(VALS_I16);
    foo(VALS_I32);
    foo(VALS_I64);

    foo(VALS_U8);
    foo(VALS_U16);
    foo(VALS_U32);
    foo(VALS_U64);
}

fn foo<T:fmt::Debug>(x: T) {
    println!("{:?}", x);
}