signal

    cfunction
    src/core/corelib.c on line 695, column 1

    (signal what x)

    Raise a signal with payload x. `what` can be an integer from 0 
    through 7 indicating user(0-7), or one of:

    $*$ :ok
    $*$ :error
    $*$ :debug
    $*$ :yield
    $*$ :user(0-7)
    $*$ :interrupt
    $*$ :await