33 lines
646 B
Rust
33 lines
646 B
Rust
//@ check-pass
|
|
|
|
use std::iter::FromIterator;
|
|
|
|
struct DynamicAlt<P>(P);
|
|
|
|
impl<P> FromIterator<P> for DynamicAlt<P> {
|
|
fn from_iter<T: IntoIterator<Item = P>>(_iter: T) -> Self {
|
|
loop {}
|
|
}
|
|
}
|
|
|
|
fn owned_context<I, F>(_: F) -> impl FnMut(I) -> I {
|
|
|i| i
|
|
}
|
|
|
|
trait Parser<I> {}
|
|
|
|
impl<T, I> Parser<I> for T where T: FnMut(I) -> I {}
|
|
|
|
fn alt<I, P: Parser<I>>(_: DynamicAlt<P>) -> impl FnMut(I) -> I {
|
|
|i| i
|
|
}
|
|
|
|
fn rule_to_parser<'c>() -> impl Parser<&'c str> {
|
|
move |input| {
|
|
let v: Vec<()> = vec![];
|
|
alt(v.iter().map(|()| owned_context(rule_to_parser())).collect::<DynamicAlt<_>>())(input)
|
|
}
|
|
}
|
|
|
|
fn main() {}
|