The Copy
trait was implemented on a type with a Drop
implementation.
Erroneous code example:
#[derive(Copy)] struct Foo; // error! impl Drop for Foo { fn drop(&mut self) { } }
Explicitly implementing both Drop
and Copy
trait on a type is currently disallowed. This feature can make some sense in theory, but the current implementation is incorrect and can lead to memory unsafety (see issue #20126), so it has been disabled for now.