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Commit | Line | Data |
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416331ca XL |
1 | // run-pass |
2 | ||
1a4d82fc JJ |
3 | trait Speak : Sized { |
4 | fn say(&self, s:&str) -> String; | |
5 | fn hi(&self) -> String { hello(self) } | |
970d7e83 LB |
6 | } |
7 | ||
1a4d82fc | 8 | fn hello<S:Speak>(s:&S) -> String{ |
970d7e83 LB |
9 | s.say("hello") |
10 | } | |
11 | ||
c34b1796 | 12 | impl Speak for isize { |
1a4d82fc JJ |
13 | fn say(&self, s:&str) -> String { |
14 | format!("{}: {}", s, *self) | |
970d7e83 LB |
15 | } |
16 | } | |
17 | ||
18 | impl<T: Speak> Speak for Option<T> { | |
1a4d82fc | 19 | fn say(&self, s:&str) -> String { |
970d7e83 | 20 | match *self { |
1a4d82fc JJ |
21 | None => format!("{} - none", s), |
22 | Some(ref x) => { format!("something!{}", x.say(s)) } | |
970d7e83 LB |
23 | } |
24 | } | |
25 | } | |
26 | ||
27 | ||
1a4d82fc | 28 | pub fn main() { |
85aaf69f SL |
29 | assert_eq!(3.hi(), "hello: 3".to_string()); |
30 | assert_eq!(Some(Some(3)).hi(), | |
1a4d82fc | 31 | "something!something!hello: 3".to_string()); |
c34b1796 | 32 | assert_eq!(None::<isize>.hi(), "hello - none".to_string()); |
970d7e83 | 33 | |
c34b1796 | 34 | assert_eq!(Some(None::<isize>).hi(), "something!hello - none".to_string()); |
85aaf69f | 35 | assert_eq!(Some(3).hi(), "something!hello: 3".to_string()); |
970d7e83 | 36 | } |