From 5aec62ee0f69d691c1c1e322029463beb8bfc3cd Mon Sep 17 00:00:00 2001
From: Maxime Devos <maximedevos@telenet.be>
Date: Thu, 3 Mar 2022 13:57:03 +0000
Subject: [PATCH] gexp: Correctly handle unquoting S-exp objects.
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This fixes a false-positive in the linter:

  guix lint -c 'wrapper-inputs' libaio

* guix/gexp.scm (gexp->approximate-sexp): Allow the 'thing' in <gexp-input> to
  be a sexp, without approximation, by testing if it is a record.
* tests/gexp.scm ("unquoted sexp (not a gexp!)"): Test it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
---
 guix/gexp.scm  | 16 +++++++++-------
 tests/gexp.scm | 15 ++++++++++++++-
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/guix/gexp.scm b/guix/gexp.scm
index e229c1fc8f..38114f8863 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -4,7 +4,7 @@
 ;;; Copyright © 2018 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2019, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
-;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
+;;; Copyright © 2021, 2022 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -174,12 +174,14 @@ (define (gexp-like? thing)
          (map (lambda (reference)
                 (match reference
                   (($ <gexp-input> thing output native)
-                   (if (gexp-like? thing)
-                       (gexp->approximate-sexp thing)
-                       ;; Simply returning 'thing' won't work in some
-                       ;; situations; see 'write-gexp' below.
-                       '(*approximate*)))
-                  (_ '(*approximate*))))
+                   (cond ((gexp-like? thing)
+                          (gexp->approximate-sexp thing))
+                         ((not (record? thing)) ; a S-exp
+                          thing)
+                         (#true
+                          ;; Simply returning 'thing' won't work in some
+                          ;; situations; see 'write-gexp' below.
+                          '(*approximate*))))))
               (gexp-references gexp))))
 
 (define (write-gexp gexp port)
diff --git a/tests/gexp.scm b/tests/gexp.scm
index 33c0e4bf8c..61ed5bc02d 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014-2022 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
+;;; Copyright © 2021-2022 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -121,6 +121,19 @@ (define defmod 'define-module) ;fool Geiser
   (let ((inside (file-append coreutils "/bin/hello")))
     (gexp->approximate-sexp #~(display '#$inside))))
 
+;; See <https://issues.guix.gnu.org/54236>.
+(test-equal "unquoted sexp (not a gexp!)"
+  '(list #(foo) (foo) () "foo" foo #xf00)
+  (let ((inside/vector #(foo))
+        (inside/list '(foo))
+        (inside/empty '())
+        (inside/string "foo")
+        (inside/symbol 'foo)
+        (inside/number #xf00))
+    (gexp->approximate-sexp
+     #~(list #$inside/vector #$inside/list #$inside/empty #$inside/string
+             #$inside/symbol #$inside/number))))
+
 (test-equal "no refs"
   '(display "hello!")
   (let ((exp (gexp (display "hello!"))))