Fatal error: all goroutines are asleep when reading from channel on main goroutine

[theluckiestsoul (Kiran Mohanty)]

Getting the following error while running the below code.

fatal error: all goroutines are asleep - deadlock!

goroutine 1 [chan receive]:
main.main()

Link: https://go.dev/play/p/2zey2TNZmv2

Note: I am getting this error while reading from the channel on the main goroutine. If I read using a separate go routine, then it works fine. I am curious to know why this is not wokring on main thread.

[NobbZ (Norbert Melzer)]

The channel is never closed, so the for range will wait for a fourth item.

I doubt it works when you use a separate go routine, it just appears to be working, as main waits for the wg, and gets a sync point there, though the receiving go routine is still waiting for data indefinitely.