mirror of https://github.com/rust-lang/rust
87 lines
1.6 KiB
Rust
87 lines
1.6 KiB
Rust
//@ check-pass
|
|
|
|
#![crate_type = "lib"]
|
|
#![allow(internal_features)]
|
|
#![no_std]
|
|
#![no_core]
|
|
#![feature(
|
|
auto_traits,
|
|
const_trait_impl,
|
|
effects,
|
|
lang_items,
|
|
no_core,
|
|
staged_api,
|
|
unboxed_closures
|
|
)]
|
|
#![stable(feature = "minicore", since = "1.0.0")]
|
|
|
|
fn test() {
|
|
fn is_const_fn<F>(_: F)
|
|
where
|
|
F: const FnOnce<()>,
|
|
{
|
|
}
|
|
|
|
const fn foo() {}
|
|
|
|
is_const_fn(foo);
|
|
}
|
|
|
|
/// ---------------------------------------------------------------------- ///
|
|
/// Const fn trait definitions
|
|
|
|
#[const_trait]
|
|
#[lang = "fn"]
|
|
#[rustc_paren_sugar]
|
|
trait Fn<Args: Tuple>: ~const FnMut<Args> {
|
|
extern "rust-call" fn call(&self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
#[const_trait]
|
|
#[lang = "fn_mut"]
|
|
#[rustc_paren_sugar]
|
|
trait FnMut<Args: Tuple>: ~const FnOnce<Args> {
|
|
extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
#[const_trait]
|
|
#[lang = "fn_once"]
|
|
#[rustc_paren_sugar]
|
|
trait FnOnce<Args: Tuple> {
|
|
#[lang = "fn_once_output"]
|
|
type Output;
|
|
|
|
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
/// ---------------------------------------------------------------------- ///
|
|
/// All this other stuff needed for core. Unrelated to test.
|
|
|
|
#[lang = "destruct"]
|
|
#[const_trait]
|
|
trait Destruct {}
|
|
|
|
#[lang = "freeze"]
|
|
unsafe auto trait Freeze {}
|
|
|
|
#[lang = "drop"]
|
|
#[const_trait]
|
|
trait Drop {
|
|
fn drop(&mut self);
|
|
}
|
|
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
|
|
#[lang = "tuple_trait"]
|
|
trait Tuple {}
|
|
|
|
#[lang = "receiver"]
|
|
trait Receiver {}
|
|
|
|
impl<T: ?Sized> Receiver for &T {}
|
|
|
|
impl<T: ?Sized> Receiver for &mut T {}
|