rust/tests/ui/regions/region-object-lifetime-in-coercion.rs
2023-01-11 09:32:08 +00:00

35 lines
786 B
Rust

// Test that attempts to implicitly coerce a value into an
// object respect the lifetime bound on the object type.
trait Foo {}
impl<'a> Foo for &'a [u8] {}
fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
let x: Box<dyn Foo + 'static> = Box::new(v);
//~^ ERROR lifetime may not live long enough
x
}
fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
Box::new(v)
//~^ ERROR lifetime may not live long enough
}
fn c(v: &[u8]) -> Box<dyn Foo> {
// same as previous case due to RFC 599
Box::new(v)
//~^ ERROR lifetime may not live long enough
}
fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
Box::new(v)
//~^ ERROR lifetime may not live long enough
}
fn e<'a:'b,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
Box::new(v) // OK, thanks to 'a:'b
}
fn main() { }