From 8b2a9928e80ecfa0b4a5f4fff2be6e154aea3780 Mon Sep 17 00:00:00 2001
From: Toothless204 <38069888+Toothless204@users.noreply.github.com>
Date: Sun, 2 Feb 2020 11:48:35 +0000
Subject: [PATCH] added check for -

---
 src/build/arg/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/build/arg/mod.rs b/src/build/arg/mod.rs
index 060b202d..bfefc1a4 100644
--- a/src/build/arg/mod.rs
+++ b/src/build/arg/mod.rs
@@ -269,6 +269,10 @@ impl<'help> Arg<'help> {
     /// ```
     /// [`short`]: ./struct.Arg.html#method.short
     pub fn short(mut self, s: char) -> Self {
+        if s == '-' {
+            panic!("Invalid option character");
+        }
+
         self.short = Some(s);
         self
     }