ControlSession.preconditionIsolated(_:file:line:)

This function's effect varies depending on the build flag used:

• In playgrounds and -Onone builds (the default for Xcode's Debug configuration), stops program execution in a debuggable state after printing message.
• In -O builds (the default for Xcode's Release configuration), stops program execution.
• Note: This check is performed against the actor's serial executor, meaning that / if another actor uses the same serial executor--by using that actor's serial executor as its own Actor/unownedExecutor--this check will succeed , as from a concurrency safety perspective, the serial executor guarantees mutual exclusion of those two actors.
• Parameters:
  • message: The message to print if the assertion fails.
  • file: The file name to print if the assertion fails. The default is where this method was called.
  • line: The line number to print if the assertion fails The default is where this method was called.