pub fn escape_unicode(c: char, f: &fn(char))
Return the hexadecimal unicode escape of a char.
The rules are as follows:
\\xNN\\uNNNN\\UNNNNNNNN
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).