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// Test various cases where the defaults should lead to errors being
// reported.
#![allow(dead_code)]
trait SomeTrait {
fn dummy(&self) { }
}
struct SomeStruct<'a> {
r: Box<dyn SomeTrait+'a>
}
fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
// `Box<SomeTrait>` defaults to a `'static` bound, so this return
// is illegal.
ss.r //~ ERROR cannot infer an appropriate lifetime
}
fn store(ss: &mut SomeStruct, b: Box<dyn SomeTrait>) {
// No error: b is bounded by 'static which outlives the
// (anonymous) lifetime on the struct.
ss.r = b;
}
fn store1<'b>(ss: &mut SomeStruct, b: Box<dyn SomeTrait+'b>) {
// Here we override the lifetimes explicitly, and so naturally we get an error.
ss.r = b; //~ ERROR explicit lifetime required in the type of `ss` [E0621]
}
fn main() {
}
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