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records: Improve reporting of "invalid field specifier" errors. 

Previously users would just see:

  error: invalid field specifier

without source location or hints.

* guix/records.scm (expand): Add optional 'parent-form' parameter and
pass it to 'syntax-violation' when it is true.
(make-syntactic-constructor): Pass S as a third argument to
'report-invalid-field-specifier'.
* guix/ui.scm (report-load-error): For 'syntax-error', show SUBFORM or
FORM in the message.
* tests/records.scm ("define-record-type* & wrong field specifier"): Add
a 'subform' parameter and adjust test accordingly.
("define-record-type* & wrong field specifier, identifier"): New test.
* tests/guix-system.sh: Add test.
This commit is contained in:
Ludovic Courtès 2020-01-16 15:00:18 +01:00
parent 84c5da08dd
commit 47212fc763
No known key found for this signature in database
GPG Key ID: 090B11993D9AEBB5
4 changed files with 69 additions and 11 deletions
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19
guix/records.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Mark H Weaver <mhw@netris.org>
;;;
;;; This file is part of GNU Guix.
@ -70,14 +70,22 @@ interface\" (ABI) for TYPE is equal to COOKIE."
"~a: record ABI mismatch; recompilation needed"
(list #,type) '()))))
(define (report-invalid-field-specifier name bindings)
"Report the first invalid binding among BINDINGS."
(define* (report-invalid-field-specifier name bindings
#:optional parent-form)
"Report the first invalid binding among BINDINGS. PARENT-FORM is used for
error-reporting purposes."
(let loop ((bindings bindings))
(syntax-case bindings ()
(((field value) rest ...) ;good
(loop #'(rest ...)))
((weird _ ...) ;weird!
(syntax-violation name "invalid field specifier" #'weird)))))
;; 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"
(if parent-form
(list parent-form #'weird)
(list #'weird)))))))
(define (report-duplicate-field-specifier name ctor)
"Report the first duplicate identifier among the bindings in CTOR."
@ -233,7 +241,8 @@ of TYPE matches the expansion-time ABI."
;; Report precisely which one is faulty, instead of letting the
;; "source expression failed to match any pattern" error.
(report-invalid-field-specifier 'name
#'(bindings (... ...))))))))))
#'(bindings (... ...))
s))))))))
(define-syntax-rule (define-field-property-predicate predicate property)
"Define PREDICATE as a procedure that takes a syntax object and, when passed

5
guix/ui.scm
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@ -372,9 +372,10 @@ ARGS is the list of arguments received by the 'throw' handler."
(format (current-error-port) (G_ "~amissing closing parenthesis~%")
location))
(apply throw args)))
(('syntax-error proc message properties form . rest)
(('syntax-error proc message properties form subform . rest)
(let ((loc (source-properties->location properties)))
(report-error loc (G_ "~a~%") message)))
(report-error loc (G_ "~s: ~a~%")
(or subform form) message)))
(('unbound-variable _ ...)
(report-unbound-variable-error args #:frame frame))
(((or 'srfi-34 '%exception) obj)

22
tests/guix-system.sh
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@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
# Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
#
@ -130,6 +130,26 @@ else
fi
fi
cat > "$tmpfile" <<EOF
(use-modules (gnu)) ; 1
(operating-system ; 3
(file-systems (cons (file-system ; 4
(device (file-system-label "root"))
(mount-point "/") ; 6
(type "ext4")))) ; 7 (!!)
%base-file-systems)
EOF
if guix system build "$tmpfile" -n 2> "$errorfile"
then false
else
# Here '%base-file-systems' appears as if it were a field specified of the
# enclosing 'operating-system' form due to parenthesis mismatch.
grep "$tmpfile:3:[0-9]\+:.*%base-file-system.*invalid field specifier" \
"$errorfile"
fi
OS_BASE='
(host-name "antelope")
(timezone "Europe/Paris")

34
tests/records.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -286,10 +286,11 @@
(lambda ()
(eval exp (test-module))
#f)
(lambda (key proc message location form . args)
(lambda (key proc message location form subform . _)
(and (eq? proc 'foo)
(string-match "invalid field" message)
(equal? form '(baz 1 2 3 4 5))
(equal? subform '(baz 1 2 3 4 5))
(equal? form '(foo (baz 1 2 3 4 5)))
;; Make sure the location is that of the field specifier.
;; See <http://bugs.gnu.org/23969>.
@ -299,6 +300,33 @@
,@(alist-delete 'line loc)))
(pk 'actual-loc location)))))))
(test-assert "define-record-type* & wrong field specifier, identifier"
(let ((exp '(begin
(define-record-type* <foo> foo make-foo
foo?
(bar foo-bar (default 42))
(baz foo-baz))
(foo
baz))) ;syntax error
(loc (current-source-location))) ;keep this alignment!
(catch 'syntax-error
(lambda ()
(eval exp (test-module))
#f)
(lambda (key proc message location form subform . _)
(and (eq? proc 'foo)
(string-match "invalid field" message)
(equal? subform 'baz)
(equal? form '(foo baz))
;; Here the location is that of the parent form.
(lset= equal?
(pk 'expected-loc
`((line . ,(- (assq-ref loc 'line) 2))
,@(alist-delete 'line loc)))
(pk 'actual-loc location)))))))
(test-assert "define-record-type* & missing initializers"
(catch 'syntax-error
(lambda ()