process trace triggered by sequential trace token

[Dmitriy Kargapolov]

Hi All,
I'd like to trace gen_server body execution, not for all calls, but for
particular one.
Is there a way to enable trace for the process by received (and matched)
message "contaminated" by trace token? (And disable it at the end of message
processing). I know there is a way to turn sequential trace by matching
regular function call, but I need things to go in reverse order...
Thanks.