From 2569bd994bab4f057ac5aa6755fdee76b1c816de Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sat, 13 Mar 2021 11:56:52 +0100
Subject: inferior: Add <inferior> printer.

This avoids printing the whole package table in backtraces and such.

* guix/inferior.scm (write-inferior): New procedure.
<top level>: Call 'set-record-type-printer!'.
---
 guix/inferior.scm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/guix/inferior.scm b/guix/inferior.scm
index f977f8386e..eb457f81f9 100644
--- a/guix/inferior.scm
+++ b/guix/inferior.scm
@@ -120,6 +120,15 @@ (define-record-type <inferior>
   (packages inferior-package-promise)            ;promise of inferior packages
   (table    inferior-package-table))             ;promise of vhash
 
+(define (write-inferior inferior port)
+  (match inferior
+    (($ <inferior> pid _ _ version)
+     (format port "#<inferior ~a ~a ~a>"
+             pid version
+             (number->string (object-address inferior) 16)))))
+
+(set-record-type-printer! <inferior> write-inferior)
+
 (define* (inferior-pipe directory command error-port)
   "Return an input/output pipe on the Guix instance in DIRECTORY.  This runs
 'DIRECTORY/COMMAND repl' if it exists, or falls back to some other method if
-- 
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