https://git.ruby-lang.org/ruby.git/commit/?id=5c646ca0a0

From 5c646ca0a09c5249b20cf5645e27ee75fe4dff04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ka=C3=ADque=20Kandy=20Koga?= <kaiquekandykoga@g...>
Date: Sun, 10 Oct 2021 16:30:42 -0300
Subject: [ruby/irb] Ignore parenthesis during completion

Rename method

https://github.com/ruby/irb/commit/619aecb412
---
 lib/irb/completion.rb       | 2 +-
 test/irb/test_completion.rb | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index a8a73cce80..9121174a50 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -197,7 +197,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/completion.rb#L197
         end
         candidates.grep(/^#{Regexp.quote(sym)}/)
 
-      when /^::([A-Z][^:\.\(]*)$/
+      when /^::([A-Z][^:\.\(\)]*)$/
         # Absolute Constant or class methods
         receiver = $1
         candidates = Object.constants.collect{|m| m.to_s}
diff --git a/test/irb/test_completion.rb b/test/irb/test_completion.rb
index 819a958887..3aa99d74d3 100644
--- a/test/irb/test_completion.rb
+++ b/test/irb/test_completion.rb
@@ -41,6 +41,13 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_completion.rb#L41
       assert_empty(IRB::InputCompletor.retrieve_completion_data(":::", bind: binding))
     end
 
+    def test_complete_absolute_constants_with_special_characters
+      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_symbol_failure
       assert_nil(IRB::InputCompletor::PerfectMatchedProc.(":aiueo", bind: binding))
     end
-- 
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