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