Self should be consistently usable within method bodies

[Diggsey]

The following code will fail to compile at "Self::new()" with the message, "error: failed to resolve. Use of undeclared type or module Self"

struct Foo;

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

While either of the following will work:

    fn bar() { <Self>::new(); }
    fn bar() { let x: Self = Foo::new(); }

The first example should compile as-is.