static variable A cannot be read at compile time

[Newbie2019 via Digitalmars-d-learn]

https://run.dlang.io/is/s4cfiv
onlineapp.d(23): Error: static variable A cannot be read at 
compile time
onlineapp.d(23): Error: cannot implicitly convert expression 1 of 
type int to int*

I see no reason the code should not work,  and the second error 
message make no sense.

please suggestion how should I made this code to work.