unit fmt;
pub fn fmt_int_i32(buf: []mut u8, v: i32) -> str;
pub fn fmt_hex_i32(buf: []mut u8, v: i32) -> str;
pub fn fmt_char(buf: []mut u8, v: char) -> str;
pub fn fmt_bool(buf: []mut u8, v: bool) -> str;
pub fn fmt_error(buf: []mut u8, v: core.Error) -> str;