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Diffstat (limited to 'src/test/ui/traits/to-str.rs')
-rw-r--r-- | src/test/ui/traits/to-str.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/traits/to-str.rs b/src/test/ui/traits/to-str.rs new file mode 100644 index 000000000..9670edbfa --- /dev/null +++ b/src/test/ui/traits/to-str.rs @@ -0,0 +1,36 @@ +// 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()); +} |