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// check-pass
pub(crate) trait Parser: Sized {
type Output;
fn parse(&mut self, _input: &str) -> Result<(), ()> {
loop {}
}
fn map<F, B>(self, _f: F) -> Map<Self, F>
where
F: FnMut(Self::Output) -> B,
{
todo!()
}
}
pub(crate) struct Chainl1<P, Op>(P, Op);
impl<P, Op> Parser for Chainl1<P, Op>
where
P: Parser,
Op: Parser,
Op::Output: FnOnce(P::Output, P::Output) -> P::Output,
{
type Output = P::Output;
}
pub(crate) fn chainl1<P, Op>(_parser: P, _op: Op) -> Chainl1<P, Op>
where
P: Parser,
Op: Parser,
Op::Output: FnOnce(P::Output, P::Output) -> P::Output,
{
loop {}
}
pub(crate) struct Map<P, F>(P, F);
impl<A, B, P, F> Parser for Map<P, F>
where
P: Parser<Output = A>,
F: FnMut(A) -> B,
{
type Output = B;
}
impl Parser for u32 {
type Output = ();
}
pub fn chainl1_error_consume() {
fn first<T, U>(t: T, _: U) -> T {
t
}
let _ = chainl1(1, 1.map(|_| first)).parse("");
}
fn main() {}
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