Match condition with a global path to singleton enum constructors just creates a new variable

[huonw]

enum Foo { A }
mod bar {
    pub fn normal(x: ::Foo) {
        use A;
        match x {
            A => {}
        }
    }
    pub fn wrong(x: ::Foo) {
        match x {
            ::A => {}
        }
    }
}

fn main() { bar::normal(A); bar::wrong(A); }

global-path-match.rs:11:13: 11:16 warning: unused variable: `A`, #[warn(unused_variable)] on by default
global-path-match.rs:11             ::A => {}
                                    ^~~
global-path-match.rs:11:13: 11:16 warning: variable names should start with a lowercase character, #[warn(uppercase_variables)] on by default
global-path-match.rs:11             ::A => {}
                                    ^~~

That is, it's not obeying the global part of the path and instead just creating a variable with the name A.

[alexcrichton]

cc @jakub-

[huonw]

Oh, and moving the use A out of normal to mod bar { use A; ... makes wrong compile without warning, so I guess the global boolean is just being ignored somewhere.