Using the exact name and syntax of a URL capture causes a runtime error

[techninja1008]

Minimal reproduction:

module Main (main) where

import Web.Scotty

main :: IO ()
main = scotty 3000 $
  get "/:some_named_capture" $ do
    val <- param "some_named_capture"
    text val

When requesting the url "/:some_named_capture" exactly, the value is not captured at all as it matches literally. This results in the param call failing.

I actually discovered this whilst reading through scotty's source and noticing the order of the guards in the go function within matchRoute. Specifically, the equal literals case is checked before the p is a capture case, which should probably be first for the expected behaviour.

[jfraudeau]

I noticed the same issue, will create a pull request.