| // Test related to when a region bound is required to be specified. |
| |
| trait IsStatic : 'static { } |
| trait IsSend : Send { } |
| trait Is<'a> : 'a { } |
| trait Is2<'a> : 'a { } |
| trait SomeTrait { } |
| |
| // Bounds on object types: |
| |
| struct Foo<'a,'b,'c> { //~ ERROR parameter `'c` is never used |
| // All of these are ok, because we can derive exactly one bound: |
| a: Box<dyn IsStatic>, |
| b: Box<dyn Is<'static>>, |
| c: Box<dyn Is<'a>>, |
| d: Box<dyn IsSend>, |
| e: Box<dyn Is<'a>+Send>, // we can derive two bounds, but one is 'static, so ok |
| f: Box<dyn SomeTrait>, // OK, defaults to 'static due to RFC 599. |
| g: Box<dyn SomeTrait+'a>, |
| |
| z: Box<dyn Is<'a>+'b+'c>, |
| //~^ ERROR only a single explicit lifetime bound is permitted |
| //~| ERROR lifetime bound not satisfied |
| } |
| |
| fn test< |
| 'a, |
| 'b, |
| A:IsStatic, |
| B:Is<'a>+Is2<'b>, // OK in a parameter, but not an object type. |
| C:'b+Is<'a>+Is2<'b>, |
| D:Is<'a>+Is2<'static>, |
| E:'a+'b // OK in a parameter, but not an object type. |
| >() { } |
| |
| fn main() { } |