Hi all,
I'm trying to learn rust and ran into an error message I don't
understand, and would appreciate some help. This code:
trait T {}
fn f<'a, V: T>(v: &'a V) -> &'a T {
v as &'a T
}
is rejected with this error message:
trait-cast.rs:4:4: 4:5 error: value may contain borrowed pointers; add
`'static` bound
trait-cast.rs:4 v as &'a T
I'm trying to upcast from V to T so that I can put v in a container of
element type T (in code not shown here). The suggestion to add a
'static bound doesn't sound like what I'm looking for.
What is the concern about borrowed pointers here? What would an
implementation of T and a caller of f look like to lead to a safety
problem?
I'm using a version of rust that is a few days old.
Thanks,
Christian.
_______________________________________________
Rust-dev mailing list
[email protected]
https://mail.mozilla.org/listinfo/rust-dev
