deprecate Process.fork #12
Description
Check crystal-lang/crystal#16644 (comment)
The deprecation warning cannot be avoided.
As said above: don't use Process.fork.
ProcesS.fork has been deprecated and undocumented since even before 1.0.0 was released; it's incompatible with MT and will be unavailable when we roll out execution contexts.
Any usage must be fixed ASAP. Instead, spawn a fiber (in a parallel execution context) start a dedicated execution context, or spawn an actual child process (e.g. by calling the current executable with special args).