pub fn is_digit_radix(c: char, radix: uint) -> bool
Checks if a character parses as a numeric digit in the given radix.
Compared to is_digit(), this function only recognizes the
characters 0-9, a-z and A-Z.
Returns true if c is a valid digit under radix, and false
otherwise.
Fails if given a radix > 36.
This just wraps to_digit().
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).