7a20fc14ef
This commit disallows acquiring a function pointer to functions tagged as `#[rustc_args_required_const]`. This is intended to be used as future-proofing for the stdsimd crate to avoid taking a function pointer to any intrinsic which has a hard requirement that one of the arguments is a constant value.
21 lines
666 B
Rust
21 lines
666 B
Rust
// Copyright 2018 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.
|
|
|
|
#![feature(attr_literals, rustc_attrs, const_fn)]
|
|
|
|
#[rustc_args_required_const(0)]
|
|
fn foo(_a: i32) {
|
|
}
|
|
|
|
fn main() {
|
|
let a = foo; //~ ERROR: this function can only be invoked directly
|
|
a(2);
|
|
}
|