improve error message

1 files changed, 1 insertions, 1 deletions

diff --git a/skate/zippy.go b/skate/zippy.go
index 5d62704..65155e8 100644
--- a/skate/zippy.go
+++ b/skate/zippy.go
@@ -223,7 +223,7 @@ func CutSep(line, sep string, column int) string {
 func makeKeyFunc(sep string, column int) func(string) (string, error) {
 	return func(s string) (string, error) {
 		if k := CutSep(s, sep, column); k == "" {
-			return k, fmt.Errorf("cannot get key: %s", s)
+			return k, fmt.Errorf("cannot get key from column %d in line (len=%d): %s", column, len(s), s)
 		} else {
 			return k, nil
 		}