From b6ba097a503de9d71f3250bad2a949556c599fd6 Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sat, 2 Dec 2017 14:39:56 +0800
Subject: [PATCH] improve error string & fix #789 (#790)

---
 engine.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/engine.go b/engine.go
index ebee36e8..444611af 100644
--- a/engine.go
+++ b/engine.go
@@ -949,7 +949,7 @@ func (engine *Engine) mapType(v reflect.Value) (*core.Table, error) {
 					}
 					if pStart > -1 {
 						if !strings.HasSuffix(k, ")") {
-							return nil, errors.New("cannot match ) charactor")
+							return nil, fmt.Errorf("field %s tag %s cannot match ) charactor", col.FieldName, key)
 						}
 
 						ctx.tagName = k[:pStart]