src/test/compile-fail/const-err.rs


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// Copyright 2012 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.

// compile-flags: -Zforce-overflow-checks=on

// these errors are not actually "const_err", they occur in trans/consts
// and are unconditional warnings that can't be denied or allowed

#![allow(exceeding_bitshifts)]
#![allow(const_err)]

fn black_box<T>(_: T) {
    unimplemented!()
}

// Make sure that the two uses get two errors.
const FOO: u8 = [5u8][1];
//~^ ERROR constant evaluation error
//~| index out of bounds: the len is 1 but the index is 1

fn main() {
    let a = -std::i8::MIN;
    //~^ WARN this expression will panic at run-time
    //~| attempt to negate with overflow
    let b = 200u8 + 200u8 + 200u8;
    //~^ WARN this expression will panic at run-time
    //~^^ WARN this expression will panic at run-time
    //~| attempt to add with overflow
    let c = 200u8 * 4;
    //~^ WARN this expression will panic at run-time
    //~| attempt to multiply with overflow
    let d = 42u8 - (42u8 + 1);
    //~^ WARN this expression will panic at run-time
    //~| attempt to subtract with overflow
    let _e = [5u8][1];
    //~^ WARN this expression will panic at run-time
    //~| index out of bounds: the len is 1 but the index is 1
    black_box(a);
    black_box(b);
    black_box(c);
    black_box(d);

    black_box((FOO, FOO));
}