gistfile1.rs

type ValNum = f64;
type ValStr = Rc<~str>;

#[deriving(Clone)]
enum Value
{
	Null,
	Bool(bool),
	Num(ValNum),
	String(ValStr),
}

// And later...
// self.stack is of type ~[Value]
print!("{}", match self.stack[i]
{
	Null => ~"null",
	Bool(b) => b.to_str(),
	Num(n) => n.to_str(),
	String(s) => s.borrow().as_slice()
});

This gives me:

main.rs:286:16: 292:4 error: match arms have incompatible types: expected `~str` but found `&str` (str storage differs: expected ~ but found &)
main.rs:286                     print!("{}", match self.stack[i]
main.rs:287                     {
main.rs:288                             Null => ~"null",
main.rs:289                             Bool(b) => b.to_str(),
main.rs:290                             Num(n) => n.to_str(),
main.rs:291                             String(s) => s.borrow().as_slice()
            ...

main.rs:291:4: 291:13 error: cannot move out of dereference of & pointer
main.rs:291                             String(s) => print!("{}", s.borrow().as_slice())
                                        ^~~~~~~~~