else if (SCM_NCONSP (obj))
SCM_WRONG_TYPE_ARG (1, obj);
#endif
- p = scm_hashq_ref (scm_source_whash, obj, (SCM) NULL);
- if (p != (SCM) NULL && SRCPROPSP (p))
+ p = scm_hashq_ref (scm_source_whash, obj, SCM_BOOL_F);
+ if (SRCPROPSP (p))
return scm_srcprops_to_plist (p);
return SCM_EOL;
}