From 4f6480d7f8da14d65f4c770082755afc2efe2c5e Mon Sep 17 00:00:00 2001
From: Pierre-Olivier Mercier <nemunaire@nemunai.re>
Date: Fri, 17 Jan 2020 07:20:00 +0100
Subject: [PATCH] sync: add some precision around Empty flags detection

---
 admin/sync/exercice_keys.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/admin/sync/exercice_keys.go b/admin/sync/exercice_keys.go
index ac518a53..89be3b60 100644
--- a/admin/sync/exercice_keys.go
+++ b/admin/sync/exercice_keys.go
@@ -126,7 +126,7 @@ func buildKeyFlag(exercice fic.Exercice, flag ExerciceFlag, flagline int, defaul
 
 	hashedFlag, err := fic.ComputeHashedFlag([]byte(raw), !flag.CaseSensitive, validatorRegexp(flag.ValidatorRe))
 	if err != nil {
-		errs = append(errs, err.Error())
+		errs = append(errs, fmt.Sprintf("%q: flag #%d: %s", path.Base(exercice.Path), flagline, err.Error()))
 		return
 	}
 	fl := fic.Flag(fic.FlagKey{