mirror of https://github.com/rust-lang/rust
78 lines
1.6 KiB
Rust
78 lines
1.6 KiB
Rust
//@ known-bug: #110395
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#![feature(const_fn_trait_ref_impls)]
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#![feature(fn_traits)]
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#![feature(unboxed_closures)]
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#![feature(const_trait_impl)]
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#![feature(const_mut_refs)]
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#![feature(const_cmp)]
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#![feature(const_refs_to_cell)]
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use std::marker::Destruct;
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const fn tester_fn<T>(f: T) -> T::Output
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where
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T: ~const Fn<()> + ~const Destruct,
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{
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f()
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}
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const fn tester_fn_mut<T>(mut f: T) -> T::Output
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where
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T: ~const FnMut<()> + ~const Destruct,
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{
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f()
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}
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const fn tester_fn_once<T>(f: T) -> T::Output
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where
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T: ~const FnOnce<()>,
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{
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f()
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}
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const fn test_fn<T>(mut f: T) -> (T::Output, T::Output, T::Output)
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where
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T: ~const Fn<()> + ~const Destruct,
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{
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(
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// impl<A: Tuple, F: ~const Fn + ?Sized> const Fn<A> for &F
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tester_fn(&f),
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// impl<A: Tuple, F: ~const Fn + ?Sized> const FnMut<A> for &F
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tester_fn_mut(&f),
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// impl<A: Tuple, F: ~const Fn + ?Sized> const FnOnce<A> for &F
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tester_fn_once(&f),
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)
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}
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const fn test_fn_mut<T>(mut f: T) -> (T::Output, T::Output)
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where
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T: ~const FnMut<()> + ~const Destruct,
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{
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(
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// impl<A: Tuple, F: ~const FnMut + ?Sized> const FnMut<A> for &mut F
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tester_fn_mut(&mut f),
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// impl<A: Tuple, F: ~const FnMut + ?Sized> const FnOnce<A> for &mut F
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tester_fn_once(&mut f),
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)
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}
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const fn test(i: i32) -> i32 {
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i + 1
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}
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fn main() {
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const fn one() -> i32 {
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1
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};
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const fn two() -> i32 {
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2
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};
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const _: () = {
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let test_one = test_fn(one);
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assert!(test_one == (1, 1, 1));
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let test_two = test_fn_mut(two);
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assert!(test_two == (2, 2));
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};
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}
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