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pub struct MacroError {
    pub msg : String,
}

impl<'a> From<&'a str> for MacroError {
    fn from(m:&'a str) -> MacroError { MacroError { msg : m.to_owned() } }
}

impl From<String> for MacroError {
    fn from(m:String) -> MacroError { MacroError { msg : m } }
}