8 pub enum Error {  enum
51 impl StdError for Error {}  implementation
53 impl fmt::Display for Error {  implementation
84     fn mul(self, other: Self) -> Result<Self, Error>;  in mul()  argument
85     fn add(self, other: Self) -> Result<Self, Error>;  in add()  argument
89     fn mul(self, other: Self) -> Result<Self, Error> {  in mul()  argument
92     fn add(self, other: Self) -> Result<Self, Error> {  in add()  argument
108     fn parse_first_char(&mut self) -> Result<Option<u64>, Error> {  in parse_first_char()  argument
124         -> Result<(), Error>  in parse_unit()  argument
156     fn parse(mut self) -> Result<Duration, Error> {  in parse()  argument
230 pub fn parse_duration(s: &str) -> Result<Duration, Error> {  in parse_duration()  argument