Function nom::error::context

pub fn context<I: Clone, E: ContextError<I>, F, O>(
    context: &'static str, 
    f: F
) -> impl FnMut(I) -> IResult<I, O, E> where
    F: Parser<I, O, E>, 

Create a new error from an input position, a static string and an existing error. This is used mainly in the context combinator, to add user friendly information to errors when backtracking through a parse tree