"Return a location object based on the info in LOC, an alist as returned
by Guile's `source-properties', `frame-source', `current-source-location',
etc."
- (let ((file (assq-ref loc 'filename))
- (line (assq-ref loc 'line))
- (col (assq-ref loc 'column)))
- ;; In accordance with the GCS, start line and column numbers at 1. Note
- ;; that unlike LINE and `port-column', COL is actually 1-indexed here...
- (location file (and line (+ line 1)) col)))
+ ;; In accordance with the GCS, start line and column numbers at 1. Note
+ ;; that unlike LINE and `port-column', COL is actually 1-indexed here...
+ (match loc
+ ((('line . line) ('column . col) ('filename . file)) ;common case
+ (and file line col
+ (make-location file (+ line 1) col)))
+ (#f
+ #f)
+ (_
+ (let ((file (assq-ref loc 'filename))
+ (line (assq-ref loc 'line))
+ (col (assq-ref loc 'column)))
+ (location file (and line (+ line 1)) col)))))
(define (location->source-properties loc)
"Return the source property association list based on the info in LOC,