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is

mech::parser

Function is 

Source 
pub fn is<'a, F, O>(parser: F) -> impl FnMut(ParseString<'a>)
where
    F: FnMut(ParseString<'a>) -> Result<(ParseString<'a>, O), Err<ParseError<'a>>>,
Expand description

For parser p, return the !!p peek parsing expression.