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// 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() {}
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