mirror of https://github.com/rust-lang/rust
55 lines
1015 B
Rust
55 lines
1015 B
Rust
//@ check-pass
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pub(crate) trait Parser: Sized {
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type Output;
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fn parse(&mut self, _input: &str) -> Result<(), ()> {
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loop {}
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}
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fn map<F, B>(self, _f: F) -> Map<Self, F>
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where
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F: FnMut(Self::Output) -> B,
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{
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todo!()
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}
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}
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pub(crate) struct Chainl1<P, Op>(P, Op);
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impl<P, Op> Parser for Chainl1<P, Op>
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where
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P: Parser,
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Op: Parser,
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Op::Output: FnOnce(P::Output, P::Output) -> P::Output,
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{
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type Output = P::Output;
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}
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pub(crate) fn chainl1<P, Op>(_parser: P, _op: Op) -> Chainl1<P, Op>
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where
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P: Parser,
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Op: Parser,
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Op::Output: FnOnce(P::Output, P::Output) -> P::Output,
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{
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loop {}
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}
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pub(crate) struct Map<P, F>(P, F);
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impl<A, B, P, F> Parser for Map<P, F>
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where
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P: Parser<Output = A>,
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F: FnMut(A) -> B,
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{
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type Output = B;
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}
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impl Parser for u32 {
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type Output = ();
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}
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pub fn chainl1_error_consume() {
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fn first<T, U>(t: T, _: U) -> T {
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t
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}
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let _ = chainl1(1, 1.map(|_| first)).parse("");
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}
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fn main() {}
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