From e52f389dc2ee7f5988b6abfb20651f9edd6b7a26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20B=C3=A9n=C3=A9teau?= <thomas@bitwise.me>
Date: Sat, 5 Aug 2017 22:04:05 +1200
Subject: Fix bug preventing '--' being passed as the first argument.

---
 lib/slop/parser.rb | 1 +
 test/error_test.rb | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/lib/slop/parser.rb b/lib/slop/parser.rb
index 7d8ad46..3cba82b 100644
--- a/lib/slop/parser.rb
+++ b/lib/slop/parser.rb
@@ -148,6 +148,7 @@ module Slop
     def partition(strings)
       if strings.include?("--")
         partition_idx = strings.index("--")
+        return [[], strings[1..-1]] if partition_idx.zero?
         [strings[0..partition_idx-1], strings[partition_idx+1..-1]]
       else
         [strings, []]
diff --git a/test/error_test.rb b/test/error_test.rb
index 848e2d5..2f7730b 100644
--- a/test/error_test.rb
+++ b/test/error_test.rb
@@ -21,6 +21,12 @@ describe Slop::MissingArgument do
     opts.string "-n", "--name"
     opts.parse %w(--name)
   end
+
+  it "does not raise if '--' appears as the first argument" do
+    opts = Slop::Options.new
+    opts.string "-n", "--name"
+    opts.parse %w(-- --name)
+  end
 end
 
 describe Slop::UnknownOption do
-- 
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