rust/tests/ui/traits/to-str.rs
2024-02-16 20:02:50 +00:00

37 lines
862 B
Rust

//@ run-pass
#![allow(non_camel_case_types)]
trait to_str {
fn to_string_(&self) -> String;
}
impl to_str for isize {
fn to_string_(&self) -> String { self.to_string() }
}
impl<T:to_str> to_str for Vec<T> {
fn to_string_(&self) -> String {
format!("[{}]",
self.iter()
.map(|e| e.to_string_())
.collect::<Vec<String>>()
.join(", "))
}
}
pub fn main() {
assert_eq!(1.to_string_(), "1".to_string());
assert_eq!((vec![2, 3, 4]).to_string_(), "[2, 3, 4]".to_string());
fn indirect<T:to_str>(x: T) -> String {
format!("{}!", x.to_string_())
}
assert_eq!(indirect(vec![10, 20]), "[10, 20]!".to_string());
fn indirect2<T:to_str>(x: T) -> String {
indirect(x)
}
assert_eq!(indirect2(vec![1]), "[1]!".to_string());
}