let variable is not gc safe

[Cnerd]

So after going through the nim manual i found out that you can overide the 
compilers gc safe analysis to assign non gc safe variables to local proc 
variables like so
    
    
    {.cast(gcsafe).}:
            let
                SERVER_HOST = SERVER_HOST
                SERVER_PORT = SERVER_PORT
                MONGO_HOST = MONGO_HOST
                MONGO_PORT = MONGO_PORT
    
    
    Run

This still feels illegal though but since the global variables are immutable i 
think all is well