Syntax

temporarily x=3, obj.property=4, ...
...  # By default, 'temporarily' is implicitly scoped to end of current block

temporarily x=3, obj.property=4, ...
  ... # optional 'endTemporarily' explicitly ends scope of 'temporarily'.
endTemporarily

# Equivalent to
local old_x = x
x = 3
local old_property = obj.property
obj.property = 4
...
obj.property = old_property
x = old_x