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/// Discovered in https://github.com/rust-lang/rust/issues/112602.
/// This caused a cycle error, which made no sense.
/// Removing the `const` part of the `many` function would make the
/// test pass again.
/// The issue was that we were running const qualif checks on
/// `const fn`s, but never using them. During const qualif checks we tend
/// to end up revealing opaque types (the RPIT in `many`'s return type),
/// which can quickly lead to cycles.
//@ check-pass
pub struct Parser<H>(H);
impl<H, T> Parser<H>
where
H: for<'a> Fn(&'a str) -> T,
{
pub const fn new(handler: H) -> Parser<H> {
Parser(handler)
}
pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
Parser::new(|_| unimplemented!())
}
}
fn main() {
println!("Hello, world!");
}
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