Classic Era macro question. Are macro conditionals usable with /run? I am trying to assign ItemRack Equipment sets to one mouse button, and then use nomod, shift and ctrl to select one of 3 sets. The concept is to equip a gear set heavy in spirit while running to the next mob/pull, and then swap in shadow damage gear before entering combat.
This works:
/run ToggleSet(“Spirit”)
This doesn’t:
/run [nomod] ToggleSet(“Spirit”)
/run [mod:shift] ToggleSet(“Shadow”)
Chat-GPT says it should work. 
Executes Lua code.
/script code
/run code
The Lua code is processed separately from macro text. You cannot use Lua code to do things like insert a condition into your macro.
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As Battlecruisr said, you can’t mix conditionals with lua code but as long as you’re not doing anything secure in combat, you could just run the pure lua version
/run if IsShiftKeyDown() then ToggleSet("Shadow") else ToggleSet("Spirit") end
Did you try the /itemrack command? Not sure if it takes conditions but, worst case, you can combine it with Macro-Talk to do what you want.
If it works natty
/itemrack [mod:ctrl] equip CTRLSET; [mod:shift] equip Shadow; equip Spirit
Macro-Talk variant
/opt [mod:ctrl] /itemrack equip CTRLSET; [mod:shift] /itemrack equip Shadow; /itemrack equip Spirit
https://www.curseforge.com/wow/addons/macro-talk
There’s also SecureCmdOptionParse if you wanna stick with the script route
https://warcraft.wiki.gg/wiki/API_SecureCmdOptionParse