55 lines
1014 B
Rust
55 lines
1014 B
Rust
// 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() {}
|