1.8.0: The ?: operator used in an lvalue context

[Mike Gran]

In guile-core-1.8-20060705, in libguile/environments.c in
core_environments_unobserve(), the question mark/colon operator is
being used without being an rvalue.  Also the value to the left of the
colon appears to be void and the value to the right appears to be a
pointer.

This gets flagged as an error by the AIX xlc compiler.  It might be
cleaner to change it into an if/else.

*** environments.c      2006-07-06 17:00:06.000000000 -0700
--- environments.c.0    2006-07-06 16:57:12.000000000 -0700
*************** 
*** 687,696 ****
          if (scm_is_eq (first, observer))
            {
              /* Remove the first observer */
!           if (handling_weaks)
!                   SCM_SET_CORE_ENVIRONMENT_WEAK_OBSERVERS (env, rest)
!           else
!                   SCM_SET_CORE_ENVIRONMENT_OBSERVERS (env, rest);
              return;
            }
  
--- 687,695 ----
          if (scm_is_eq (first, observer))
            {
              /* Remove the first observer */
!             handling_weaks
!               ? SCM_SET_CORE_ENVIRONMENT_WEAK_OBSERVERS (env, rest)
!               : SCM_SET_CORE_ENVIRONMENT_OBSERVERS (env, rest);
              return;
            }


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