Showcase pattern matching bug

[udoprog]

Currently doesn't build because it adds a test case which showcases a pattern matching bug:

enum Inst { A, Unknown }

pub fn works() {
    let program = [];
    let inst = match "a" { "a" => Inst::A, _ => Inst::Unknown };
    program.push(inst);
    assert_eq!(program, [Inst::A]);
}

pub fn broken() {
    let program = [];
    program.push(match "a" { "a" => Inst::A, _ => Inst::Unknown });
    assert_eq!(program, [Inst::A]);
}

pub fn main() {
    works();
    broken();
}