scheme expressions in \property

[Werner LEMBERG]

In an m4 macro I want to do this:

  \property Current.DynamicText
    \set #'extra-offset = #'($1 . (+ 2.5 $2))

($1 and $2 are m4's macro arguments), but I get the following warning
message (for $1 = -2 and $2 = 0):

  Interpreting music...
  Type check for `extra-offset' failed;
  value `(-2 + 2.5 0)' must be of type `pair of numbers'

Any solution for this problem?


    Werner