lifetimes

errormsg

struct.rs:19:9: 21:10 error: cannot infer an appropriate lifetime due to conflicting requirements
struct.rs:19         |Request| -> Response {
struct.rs:20             Response { data: self.database.to_owned() }
struct.rs:21         }
struct.rs:18:56: 22:6 note: first, the lifetime cannot outlive the block at 18:55...
struct.rs:18     fn index<'b>(&'b self) -> 'a |Request| -> Response {
struct.rs:19         |Request| -> Response {
struct.rs:20             Response { data: self.database.to_owned() }
struct.rs:21         }
struct.rs:22     }
struct.rs:19:9: 21:10 note: ...so that closure does not outlive its stack frame
struct.rs:19         |Request| -> Response {
struct.rs:20             Response { data: self.database.to_owned() }
struct.rs:21         }
struct.rs:18:56: 22:6 note: but, the lifetime must be valid for the lifetime &'a  as defined on the block at 18:55...
struct.rs:18     fn index<'b>(&'b self) -> 'a |Request| -> Response {
struct.rs:19         |Request| -> Response {
struct.rs:20             Response { data: self.database.to_owned() }
struct.rs:21         }
struct.rs:22     }
struct.rs:19:9: 21:10 note: ...so that types are compatible (expected `'a |Request| -> Response` but found `|Request| -> Response`)
struct.rs:19         |Request| -> Response {
struct.rs:20             Response { data: self.database.to_owned() }
struct.rs:21         }
error: aborting due to previous error

structs.rs

struct Context<'a> {
    database: &'a str,
}

struct Router<'a> {
    route : 'a |Request| -> Response,
}

struct Request {
    url: ~str,
}

struct Response {
    data: ~str,
}

impl<'a> Context<'a> {
    fn index<'b>(&'b self) -> 'a |Request| -> Response {
        |Request| -> Response {
            Response { data: self.database.to_owned() }
        }
    }
}

fn main() {
    let x = Context { database : "Hello!" };
    let t = Request { url : ~"localhost" };
    let r = Router { route: x.index() };
    println!("route: {}", (r.route)(t).data);
}