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// run-pass
pub trait Parser {
type Input;
}
pub struct Iter<P: Parser>(P, P::Input);
pub struct Map<P, F>(P, F);
impl<P, F> Parser for Map<P, F> where F: FnMut(P) {
type Input = u8;
}
trait AstId { type Untyped; }
impl AstId for u32 { type Untyped = u32; }
fn record_type<Id: AstId>(i: Id::Untyped) -> u8 {
Iter(Map(i, |_: Id::Untyped| {}), 42).1
}
pub fn main() {
assert_eq!(record_type::<u32>(3), 42);
}
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