|
#![allow(non_camel_case_types)]
|
|
|
|
trait Parser<T> {
|
|
fn parse(text: &str) -> Option<T>;
|
|
}
|
|
|
|
impl<bool> Parser<bool> for bool {
|
|
fn parse(text: &str) -> Option<bool> {
|
|
Some(true) //~ ERROR mismatched types
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
println!("{}", bool::parse("ok").unwrap_or(false));
|
|
}
|