https://git.ruby-lang.org/ruby.git/commit/?id=30cc07fdc1

From 30cc07fdc127e36d42e832bfcca755c863daf336 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Mon, 21 Jun 2021 18:44:10 +0900
Subject: Check Ruby version to use Fiddle with variadic args in test-all

---
 lib/reline/terminfo.rb | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/reline/terminfo.rb b/lib/reline/terminfo.rb
index cfc8280..01e8df4 100644
--- a/lib/reline/terminfo.rb
+++ b/lib/reline/terminfo.rb
@@ -9,8 +9,17 @@ module Reline::Terminfo https://github.com/ruby/ruby/blob/trunk/lib/reline/terminfo.rb#L9
   @curses_dl = nil
   def self.curses_dl
     return @curses_dl if @curses_dl
-    if Fiddle.const_defined?(:VERSION) and Gem::Version.create(Fiddle::VERSION) >= Gem::Version.create('1.0.1')
+    if RUBY_VERSION >= '3.0.0'
+      # Gem module isn't defined in test-all of the Ruby repository, and
+      # Fiddle in Ruby 3.0.0 or later supports Fiddle::TYPE_VARIADIC.
+      fiddle_supports_variadic = true
+    elsif Fiddle.const_defined?(:VERSION) and Gem::Version.create(Fiddle::VERSION) >= Gem::Version.create('1.0.1')
       # Fiddle::TYPE_VARIADIC is supported from Fiddle 1.0.1.
+      fiddle_supports_variadic = true
+    else
+      fiddle_supports_variadic = false
+    end
+    if fiddle_supports_variadic
       %w[libncursesw.so libcursesw.so libncurses.so libcurses.so].each do |curses_name|
         result = Fiddle::Handle.new(curses_name)
       rescue Fiddle::DLError
-- 
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