Suppose I have some X: Copy
If I write
impl X {
fn foo(???self) { }
}
what is the preferable form of self, &self or self? Because the type is Copy, both would work fine.
The argument for &self is consistency. The argument for self is that there are no lifetimes, which can save you from lifetime miselision (In my case, I had X<'f>: Copy and wanted fn foo(&self) -> Y<'f>, while lifetime elision has given me fn foo(&'a self) -> Y<'a>).