#fmt "%?" does not print newline escape char

[erickt]

The polymorphic printer for strings does not print out escape characters like \n. Instead it uses the \x0a form. Here's a demonstration:

fn main() {
    #error("%?", "foo\nbar");
}

displays rust: ""foo\x0abar""

[brson]

@erickt This is done?

[erickt]

Yep!