Print method can return : to decline printing.

* struct.c (struct_inst_print): Check return value of print
method call. If it is the colon keyword, then do not return
but rather continue to the regular struct printing code.

* txr.1: Documented.

1 files changed, 2 insertions, 3 deletions

diff --git a/struct.c b/struct.c
index 91e6807c..af2bdaaf 100644
--- a/struct.c
+++ b/struct.c
@@ -1316,9 +1316,8 @@ static void struct_inst_print(val obj, val out, val pretty,
     if (!nullocp(ptr)) {
       if (compat)
         funcall2(deref(ptr), obj, out);
-      else
-        funcall3(deref(ptr), obj, out, pretty);
-      return;
+      else if (funcall3(deref(ptr), obj, out, pretty) != colon_k)
+        return;
     }
   }