Function float 

pub fn float<'a, N, I, C>(neg: bool) -> impl Parser<I, Output = N> + 'a
where
    N: Float + Float + 'a,
    I: Input<Ok = C> + ?Sized + 'a,
    C: Character + 'a,

A floating point number.

This parser requires an integer part, but a decimal part and an exponent are optional. If you want to apply different rules, you can implement it by yourself using compute_float() helper function.

Also note that this function doesn’t support infinities and NaNs.