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// Regression test for Issue #20971.
//@ run-fail
//@ error-pattern:Hello, world!
//@ needs-subprocess
pub trait Parser {
type Input;
fn parse(&mut self, input: <Self as Parser>::Input);
}
impl Parser for () {
type Input = ();
fn parse(&mut self, input: ()) {}
}
pub fn many() -> Box<dyn Parser<Input = <() as Parser>::Input> + 'static> {
panic!("Hello, world!")
}
fn main() {
many().parse(());
}
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