Package app: Improve error message.

diff --git a/app/user.go b/app/user.go
index 3f5b97e..563f449 100644 (file)
--- a/app/user.go
+++ b/app/user.go
@@ -103,7 +103,7 @@ func (u *User) OAuthClient(ctx context.Context, svc string, cfg *oauth2.Config)
 
        var tok oauth2.Token
        if err := datastore.Get(ctx, key, &tok); err != nil {
-               return nil, err
+               return nil, fmt.Errorf("datastore.Get(%v) = %v", key, err)
        }
 
        src := cfg.TokenSource(ctx, &tok)