Testing for Shorthand Lookup

1 files changed, 3 insertions, 1 deletions

diff --git a/flag.go b/flag.go
index 0519465..6f1fc30 100644
--- a/flag.go
+++ b/flag.go
@@ -327,7 +327,9 @@ func (f *FlagSet) ShorthandLookup(name string) *Flag {
 		return nil
 	}
 	if len(name) > 1 {
-		panic("can't look up for a shorthand with name more than one character")
+		msg := fmt.Sprintf("can not look up shorthand which is more than one ASCII character: %q", name)
+		fmt.Fprintf(f.out(), msg)
+		panic(msg)
 	}
 	c := name[0]
 	return f.shorthands[c]