Let ReadP carry a failure message

[David Feuer]

My main concern is that while you'll get error messages from parse
failures, they may not actually do a good job of pointing to the cause of
the failure. I don't know much about parsing, but I gather that a lot of
people have put a lot of work into designing parsing frameworks with decent
error reporting, and you're not likely to get anything near that by
grafting errors onto a more primitive system.

On Thu, Nov 19, 2020, 10:25 PM Dannyu NDos <ndospark320 at gmail.com> wrote:

> Well, I once tried implementing a parser that evaluates integer
> addition, multiplication, exponential, tetration, pentation, and so on
> infinitely. The operators were + with precedence 6, * with precedence
> 7, ^ with precedence 8, ^^ with precedence 9 (for tetration), ^^^ with
> precedence 10 (for pentation), ^^^^ with precedence 11 (for hexation),
> and so on infinitely. I've not succeeded implementing it using
> ordinary ReadP.
>
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