How to bind shift+alt to run script

Question

So my goal is just bind alt+shift to run script in xmonad. My mod key is super(win)(mod4Mask). How can I do this? This is how I try to do it now:

This is how my xmonad.sh looks like now (just path changed)

import XMonad
import XMonad.Config.Desktop
import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks
import XMonad.Util.
import XMonad.Util.EZConfig
import System.IO

main = xmonad $ desktopConfig
  { terminal = "urxvt"
  , modMask  = mod4Mask
  } `additionalKeys`
  [ ((mod1Mask, shiftMask), spawn "/home/my-login/some-folder/my-script.sh"
  ]

And this is the error which I get: output

Answer 1

The important part of that error seems to be (with extra spaces for readability):

Expected type: KeySym

Actual type: KeyMask

In the expression: shiftMask

So, apparently you need to use a KeySym instead of a KeyMask for the second part of the key combo. That's likely because the "modifier keys" (Ctrl, Alt, Shift, Cmd/Win/Super) are "masks" (bitmasks) that change the internally-generated code when other keys are pressed, but they don't do so for each other.

If you are okay using 2 modifiers + 1 regular key for this effect you can "or" the modifiers together as per this answer and pick a KeySym that's not already mapped to that 3-key combo.

If losing/moving one of the modifier keys is okay the answer below that is from someone who uses xmodmap to remap the left Ctrl key to the left Super/Win key. So, you could remap a KeyMask to a KeySym if it would somehow be worth it.

Answer 2

Yay, I found it:

, ((shiftMask, xK_Alt_L), spawn "$HOME/.local/bin/dmscripts/dm-lang"  ) -- Language Switching

You can use xmodmap or xev to find out the keysym and all you need to do is append xK_ to it.

Now just need to figure out if I can use this with EZConfig's AdditionalKeysP as well