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-rw-r--r--guix/records.scm14
1 files changed, 8 insertions, 6 deletions
diff --git a/guix/records.scm b/guix/records.scm
index e7b86af9aa..c833fdb339 100644
--- a/guix/records.scm
+++ b/guix/records.scm
@@ -78,7 +78,8 @@ It is possible to copy an object 'x' created with 'thing' like this:
This expression returns a new object equal to 'x' except for its 'name'
field."
- (define (make-syntactic-constructor type name ctor fields thunked defaults)
+ (define* (make-syntactic-constructor type name ctor fields
+ #:key thunked defaults)
"Make the syntactic constructor NAME for TYPE, that calls CTOR, and
expects all of FIELDS to be initialized. DEFAULTS is the list of
FIELD/DEFAULT-VALUE tuples, and THUNKED is the list of identifiers of
@@ -219,7 +220,10 @@ thunked fields."
(syntax-case s ()
((_ type syntactic-ctor ctor pred
(field get options ...) ...)
- (let* ((field-spec #'((field get options ...) ...)))
+ (let* ((field-spec #'((field get options ...) ...))
+ (thunked (filter-map thunked-field? field-spec))
+ (defaults (filter-map field-default-value
+ #'((field options ...) ...))))
(with-syntax (((field-spec* ...)
(map field-spec->srfi-9 field-spec))
((thunked-field-accessor ...)
@@ -236,10 +240,8 @@ thunked fields."
(begin thunked-field-accessor ...)
#,(make-syntactic-constructor #'type #'syntactic-ctor #'ctor
#'(field ...)
- (filter-map thunked-field? field-spec)
- (filter-map field-default-value
- #'((field options ...)
- ...))))))))))
+ #:thunked thunked
+ #:defaults defaults))))))))
(define* (alist->record alist make keys
#:optional (multiple-value-keys '()))