2 files changed, 42 insertions, 0 deletions
diff --git a/lib/forwardable/forwardable.gemspec b/lib/forwardable/forwardable.gemspec
new file mode 100644
index 0000000000..9ad59c5f8a
--- /dev/null
+++ b/lib/forwardable/forwardable.gemspec
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+name = File.basename(__FILE__, ".gemspec")
+version = ["lib", Array.new(name.count("-")+1, "..").join("/")].find do |dir|
+  break File.foreach(File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")) do |line|
+    /^\s*VERSION\s*=\s*"(.*)"/ =~ line and break $1
+  end rescue nil
+end
+
+Gem::Specification.new do |spec|
+  spec.name          = name
+  spec.version       = version
+  spec.authors       = ["Keiju ISHITSUKA"]
+  spec.email         = ["keiju@ruby-lang.org"]
+
+  spec.summary       = %q{Provides delegation of specified methods to a designated object.}
+  spec.description   = %q{Provides delegation of specified methods to a designated object.}
+  spec.homepage      = "https://github.com/ruby/forwardable"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
+
+  spec.required_ruby_version = '>= 2.4.0'
+  spec.files         = ["forwardable.gemspec", "lib/forwardable.rb", "lib/forwardable/impl.rb"]
+  spec.bindir        = "exe"
+  spec.executables   = []
+  spec.require_paths = ["lib"]
+end
diff --git a/lib/forwardable/impl.rb b/lib/forwardable/impl.rb
new file mode 100644
index 0000000000..58a9dfb69c
--- /dev/null
+++ b/lib/forwardable/impl.rb
@@ -0,0 +1,16 @@
+# :stopdoc:
+module Forwardable
+  def self._valid_method?(method)
+    catch {|tag|
+      eval("BEGIN{throw tag}; ().#{method}", binding, __FILE__, __LINE__)
+    }
+  rescue SyntaxError
+    false
+  else
+    true
+  end
+
+  def self._compile_method(src, file, line)
+    eval(src, nil, file, line)
+  end
+end