From 76ee4edb97da67d2ab6f289de14cd3ac334c372d Mon Sep 17 00:00:00 2001
From: ima1zumi <52617472+ima1zumi@users.noreply.github.com>
Date: Tue, 6 Jun 2023 03:34:05 +0900
Subject: [PATCH] [ruby/irb] Fixed string escaping omissions
 (https://github.com/ruby/irb/pull/599)

I received a `RegexpError` when I typed `::Array[`.
::Array[/Users/mi/ghq/github.com/ruby/irb/lib/irb/completion.rb:236:in `retrieve_completion_data': premature end of char-class: /^Array[/ (RegexpError)
---
 lib/irb/completion.rb       | 2 +-
 test/irb/test_completion.rb | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index 84f4c4e35a..64e387d49c 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -233,7 +233,7 @@ module IRB
         if doc_namespace
           candidates.find { |i| i == receiver }
         else
-          candidates.grep(/^#{receiver}/).collect{|e| "::" + e}
+          candidates.grep(/^#{Regexp.quote(receiver)}/).collect{|e| "::" + e}
         end
 
       when /^([A-Z].*)::([^:.]*)$/
diff --git a/test/irb/test_completion.rb b/test/irb/test_completion.rb
index e259428d76..6a24f0f9ba 100644
--- a/test/irb/test_completion.rb
+++ b/test/irb/test_completion.rb
@@ -310,6 +310,7 @@ module TestIRB
       assert_empty(IRB::InputCompletor.retrieve_completion_data("::A.", bind: binding))
       assert_empty(IRB::InputCompletor.retrieve_completion_data("::A(", bind: binding))
       assert_empty(IRB::InputCompletor.retrieve_completion_data("::A)", bind: binding))
+      assert_empty(IRB::InputCompletor.retrieve_completion_data("::A[", bind: binding))
     end
 
     def test_complete_reserved_words