upeval — Evaluate script in next stack frame up.
upeval
[level]
script
The upeval command evaluates
one stack
frame up from the current stack frame, if
script is not
present. If
level is
present, upeval behaves like so: if
level is less
than one, the
level is run
that many levels down from the top of the stack. If it's 0,
the script is run at the global level, and if it's a
positive number, the script is run at that absolute level up
from the global namespace.
script