Optimize forwarded calls

Fixes [#312]

lib/rubocop/ast.rb

@@ -5,6 +5,7 @@
 require 'set'
 
 require_relative 'ast/ext/range'
+require_relative 'ast/utilities/simple_forwardable'
 require_relative 'ast/node_pattern/method_definer'
 require_relative 'ast/node_pattern'
 require_relative 'ast/node/mixin/descendence'

lib/rubocop/ast/node/mixin/collection_node.rb

@@ -4,7 +4,7 @@ module RuboCop
   module AST
     # A mixin that helps give collection nodes array polymorphism.
     module CollectionNode
-      extend Forwardable
+      extend SimpleForwardable
 
       ARRAY_METHODS =
         (Array.instance_methods - Object.instance_methods - [:to_a]).freeze

lib/rubocop/ast/node_pattern.rb

@@ -48,7 +48,7 @@ def def_node_search(method_name, pattern_str, **keyword_defaults)
         end
       end
 
-      extend Forwardable
+      extend SimpleForwardable
       include MethodDefiner
       Invalid = Class.new(StandardError)
 

lib/rubocop/ast/node_pattern/compiler.rb

@@ -9,7 +9,7 @@ class NodePattern
       # Doc on how this fits in the compiling process:
       #   /docs/modules/ROOT/pages/node_pattern.adoc
       class Compiler
-        extend Forwardable
+        extend SimpleForwardable
         attr_reader :captures, :named_parameters, :positional_parameters, :binding
 
         def initialize

lib/rubocop/ast/node_pattern/node.rb

@@ -5,7 +5,7 @@ module AST
     class NodePattern
       # Base class for AST Nodes of a `NodePattern`
       class Node < ::Parser::AST::Node
-        extend Forwardable
+        extend SimpleForwardable
         include ::RuboCop::AST::Descendence
 
         MATCHES_WITHIN_SET = %i[symbol number string].to_set.freeze

lib/rubocop/ast/node_pattern/parser.rb

@@ -11,7 +11,7 @@ class NodePattern
       # Doc on how this fits in the compiling process:
       #   /docs/modules/ROOT/pages/node_pattern.adoc
       class Parser < Racc::Parser
-        extend Forwardable
+        extend SimpleForwardable
 
         Builder = NodePattern::Builder
         Lexer = NodePattern::Lexer

lib/rubocop/ast/utilities/simple_forwardable.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module RuboCop
+  # Similar to `Forwardable#def_delegators`, but simpler & faster
+  module SimpleForwardable
+    def def_delegators(accessor, *methods)
+      methods.each do |method|
+        class_eval(<<~RUBY, __FILE__, __LINE__ + 1)
+          def #{method}(...)         # def example(...)
+            #{accessor}.#{method}(...) #   foo.example(...)
+          end                          # end
+        RUBY
+      end
+    end
+  end
+end