7b9519a5d4
Instead of suppressing only trait errors that are "exact duplicates", display only the "most high-level" error when there are multiple trait errors with the same span that imply each-other. e.g. when there are both `[closure]: Fn` and `[closure]: FnOnce`, omit displaying the `[closure]: FnOnce` bound.
37 lines
1.0 KiB
Rust
37 lines
1.0 KiB
Rust
// Copyright 2014 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.
|
|
|
|
// Tests that unsafe extern fn pointers do not implement any Fn traits.
|
|
|
|
use std::ops::{Fn,FnMut,FnOnce};
|
|
|
|
extern "C" fn square(x: &isize) -> isize { (*x) * (*x) }
|
|
|
|
fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 }
|
|
fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 }
|
|
fn call_it_once<F:FnOnce(&isize)->isize>(_: F, _: isize) -> isize { 0 }
|
|
|
|
fn a() {
|
|
let x = call_it(&square, 22);
|
|
//~^ ERROR E0277
|
|
}
|
|
|
|
fn b() {
|
|
let y = call_it_mut(&mut square, 22);
|
|
//~^ ERROR E0277
|
|
}
|
|
|
|
fn c() {
|
|
let z = call_it_once(square, 22);
|
|
//~^ ERROR E0277
|
|
}
|
|
|
|
fn main() { }
|