> In the code above, make([]proc(msg: string), len(arr)+1) generates a slice of procedure pointers with a length of len(arr)+1. Essentially, it allocates memory on the heap and returns a slice header, which includes a pointer to the allocated memory, along with the length and capacity of the slice.

I guess things get exciting when that allocation fails, given that such a failure is nowhere checked for and the possibility of such failure is nowhere mentioned.