44 lines
1.2 KiB
Rust
44 lines
1.2 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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extern {
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fn write(fildes: i32, buf: *const i8, nbyte: u64) -> i64;
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}
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#[inline(always)]
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fn size_of<T>(_: T) -> usize {
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::std::mem::size_of::<T>()
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}
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macro_rules! write {
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($arr:expr) => {{
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#[allow(non_upper_case_globals)]
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const stdout: i32 = 1;
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unsafe {
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write(stdout, $arr.as_ptr() as *const i8,
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$arr.len() * size_of($arr[0]));
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//~^ ERROR mismatched types
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}
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}}
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}
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macro_rules! cast {
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($x:expr) => ($x as ())
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//~^ ERROR non-scalar cast: `i32` as `()`
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}
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fn main() {
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let hello = ['H', 'e', 'y'];
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write!(hello);
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//~^ NOTE in this expansion of write!
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cast!(2);
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//~^ NOTE in this expansion of cast!
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}
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