bug#46522: [PATCH]: Return *unspecified* for define-wrapped-pointer-type.

[Zhu Zihao]

In (system foreign), define-wrapped-pointer-type return the printer
procedure. It's better to return *unspecified* just like
define-record-type in srfi-9.

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>From b31a5511c530e6b255d3eadf7bae55893eacf3ea Mon Sep 17 00:00:00 2001
From: Zhu Zihao <all_but_last@163.com>
Date: Mon, 15 Feb 2021 11:56:13 +0800
Subject: [PATCH] Return *unspecified* for define-wrapped-pointer-type.

* module/system/foreign.scm (define-wrapped-pointer-type): Return *unspecified*.
---
 module/system/foreign.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/module/system/foreign.scm b/module/system/foreign.scm
index d1c2ceb96..d8e0d44cc 100644
--- a/module/system/foreign.scm
+++ b/module/system/foreign.scm
@@ -197,4 +197,5 @@ which does the reverse.  PRINT must name a user-defined 
object printer."
                        (let ((o (%wrap ptr)))
                          (hash-set! ptr->obj ptr o)
                          o)))))
-             (set-record-type-printer! type-name print)))))))
+             (set-record-type-printer! type-name print)
+             *unspecified*))))))
-- 
2.30.0


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Zihao