| // 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(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); |
| } |
