GNU bug report logs - #50914
[PATCH] records: Raise a &fix-hint if a field has multiple values.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Maxime Devos <maximedevos <at> telenet.be>
To: guix-patches <at> gnu.org
Cc: Maxime Devos <maximedevos <at> telenet.be>
Subject: [PATCH] records: Raise a &fix-hint if a field has multiple values.
Date: Thu, 30 Sep 2021 11:32:29 +0200

* guix/records.scm (report-invalid-field-specifier): If
  'weird' is something like (field (record ...) extra ...), hint that 'extra
  ...' should probably be moved inside (record ...).
---
 guix/records.scm | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/guix/records.scm b/guix/records.scm
index ed94c83dac..db0c0a7ca0 100644
--- a/guix/records.scm
+++ b/guix/records.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo <at> gnu.org>
 ;;; Copyright © 2018 Mark H Weaver <mhw <at> netris.org>
+;;; Copyright © 2021 Maxime Devos <maximedevos <at> telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,10 +22,13 @@
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-35)
+  #:use-module (ice-9 exceptions)
   #:use-module (ice-9 match)
   #:use-module (ice-9 regex)
   #:use-module (ice-9 rdelim)
   #:autoload (system base target) (target-most-positive-fixnum)
+  #:autoload (guix diagnostics) (&fix-hint)
   #:export (define-record-type*
             this-record
 
@@ -83,10 +87,35 @@ error-reporting purposes."
          ;; WEIRD may be an identifier, thus lacking source location info, and
          ;; BINDINGS is a list, also lacking source location info.  Hopefully
          ;; PARENT-FORM provides source location info.
-         (apply syntax-violation name "invalid field specifier"
+         (let ((forms
                 (if parent-form
                     (list parent-form #'weird)
-                    (list #'weird)))))))
+                    (list #'weird))))
+           (syntax-case #'weird ()
+             ;; common mistake
+             ((field (record-name fields ...) extra-value extra-value* ...)
+              (raise-exception
+               (condition
+                (&origin (origin name))
+                (&message (message
+                           (format #f "field ‘~a’ should only have one \
+value, but an extra value ‘~a’ was passed as well.  Perhaps this extra \
+value was supposed to be a field specifier, and needs to be moved inside \
+the record ‘~a’?"
+                                   (syntax->datum #'field)
+                                   (syntax->datum #'extra-value)
+                                   (syntax->datum #'(record-name fields ...)))))
+                (&syntax (form (car forms))
+                         (subform (and (not (null? (cdr forms)))
+                                       (cadr forms))))
+                (&fix-hint (hint (object->string
+                                  (syntax->datum
+                                   #'(field
+                                      (record-name fields ... extra-value
+                                                   extra-value* ...)))))))))
+             (_
+              (apply syntax-violation name
+                     "invalid field specifier" forms))))))))
 
   (define (report-duplicate-field-specifier name ctor)
     "Report the first duplicate identifier among the bindings in CTOR."

base-commit: 808f9ffbd3106da4c92d2367b118b98196c9e81e
prerequisite-patch-id: 7fdac44e8681baaf419cbf8da78cdebb8b9f9757
prerequisite-patch-id: 1f7f1597b9c85b2b1f9db1044d193bcf6ec8650e
prerequisite-patch-id: 588ca94b9c4603424094a9cc2854c4f9bc83c7e4
prerequisite-patch-id: 82b4951463e8979d1c4cd15e1ca6a36308b21b51
prerequisite-patch-id: 75cdb9eb6b038adfb605253163b94efd51e0276c
prerequisite-patch-id: 35140f4f2873d0b9f4fc8caca6ec2e013ecb830a
prerequisite-patch-id: ed97d14afd166e7b6cac37e3aa87a85246f7e320
prerequisite-patch-id: 3f3d43f5583dce32af7d4e9925771e581c3cc5ee
prerequisite-patch-id: e8f735697c0535afe9335448b16e3e1f308de362
prerequisite-patch-id: eaf1f67c4c07482fb4da81525cbd5dcb1ea2194e
prerequisite-patch-id: 9a15aa08fbbbf110ba76409dcc2a3ab5e0764806
prerequisite-patch-id: 675a3c516f47dfcbaf61d5ad41ca7f3babdd3f20
prerequisite-patch-id: ac188cb61957c9639d0ac125c941950afbdba9c7
prerequisite-patch-id: f3f1f02944a4aa9635ce7094bfda254315d990b3
prerequisite-patch-id: 5eee450b2221d67fbda1e6581d16628394c912a7
prerequisite-patch-id: bad535152857928abf624dc49dc2b27718d3885e
prerequisite-patch-id: 623edc835c2c5dfd8c83dcf32e650cfebea42aa0
prerequisite-patch-id: c0f50259e7fc09455f77dca31113b0b55e955220
prerequisite-patch-id: 9c7c0929a48b103b6b69626dbc86d7744f2f40ad
prerequisite-patch-id: 8f8c2af0b856f56c7798a3b79ba90b073bbb382f
prerequisite-patch-id: 7d88402829a8967c23650dffe115a94ae26433da
prerequisite-patch-id: ffb3d6215a89195f6e0f274f2f119c1f7b65259a
prerequisite-patch-id: 54eec153e523b58c3670c48afda9ef50ec44eb8e
prerequisite-patch-id: bc5dfc06e9d67d10a37fbd7ba61939907d93ca7c
prerequisite-patch-id: f85cc1c9eac0d44f40afe2a547ac3d866769f685
prerequisite-patch-id: 0db9692e872bf73242cfec6f8aa390abe14d08f1
prerequisite-patch-id: 36431a656d29e90e8eb218730c64807e2477c9d7
prerequisite-patch-id: 6817d73f5e42ccd33b19642ea4ef62814ad2b10e
prerequisite-patch-id: 9146aec4a40f7da60a4c64643a9aa0e405567b04
prerequisite-patch-id: ff2daf978d58ec12c25dcbce4e7ee010d337cd54
prerequisite-patch-id: c88d74073fcd5d1ff19a4a9338b0df63b648d98a
prerequisite-patch-id: 3032f2193b95d5cb625e33daec015f3354f01903
-- 
2.33.0

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