!TITLE Routines with final string parameters gobble store

      Fixed 27/5/82

There is a problem with routines whose last argument is a string parameter, and
which do not themselves call other routines. Each time a routine of this sort
is called space for the string is claimed from the stack, and is not returned.
However when the enclosing routine terminates, the space is reclaimed. 

eg: suppose you have the following routines

  %routine check length(%string(255) s)
     %signal 10,1 %if length(s)>25
  %end

  %routine dummy
     check length(s1)
     check length(s2)
     check length(s3)
  %end

The stack front will advance 256 bytes for each call of check length, but will
collapse correctly on the return from dummy.

This is a fairly unlikely bug to encounter.