[JASS] Event: detect "can't build there"

[Teelo]

Is there an event I've overlooked that will detect when a player attempts to place a building somewhere but can't because something is in the way or they don't have vision?

Not just at the time they place it, but also when the worker arrives at the spot but reports he can't carry out the order.

Closest I've been able to find is the "wait for sound to play" trigger action... perhaps I could have a trigger run every second with that action, and somehow detect whether that action got skipped or not?

 

[Troll-Brain]

Even if you could use this internal sound, that wouldn't work if the player has turned of wc3 sound.

At the time they place it, you can handle point orders events.
But for "when the worker arrives at the spot but reports he can't carry out the order", you could only check periodically if the worker current order is not 0 before the construct start event fire. (i don't know what happens if the worker is paused/stunned).
Ofc, you will have to avoid this check if the worker receives an other order (he will receive the order 851973 if it's paused/stunned).
Or maybe just check for ability events, (the build one).