20 lines
372 B
Rust
20 lines
372 B
Rust
// error-pattern: requires `generator` lang_item
|
|
#![feature(no_core, lang_items, unboxed_closures)]
|
|
#![no_core]
|
|
|
|
#[lang = "sized"] pub trait Sized { }
|
|
|
|
#[lang = "fn_once"]
|
|
#[rustc_paren_sugar]
|
|
pub trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
pub fn abc() -> impl FnOnce(f32) {
|
|
|_| {}
|
|
}
|
|
|
|
fn main() {}
|