Propose to refer to struct as Self

[vanillajonathan]

A yellow light bulb should appear that proposes that the user renames the return type to Self.

From:

struct Foo {
    bar: u8,
}

impl Foo {
    fn new(bar: u8) -> Foo {
        Foo { bar }
    }
}

Into:

struct Foo {
    bar: u8,
}

impl Foo {
    fn new(bar: u8) -> Self { // Foo into Self
        Self { bar } // Foo into Self
    }
}