Move rubocop:disable comments out of documentation

When `rubocop:disable` is used immediately above a method or module
declaration, it becomes part of the documentation.

Instead, if we inline it with the declaration itself, it is not included
in the documentation. As a side benefit, RuboCop attaches it to that
declaration only, removing the need to `rubocop:enable` afterwards.

However, YARD applies it as documentation to whatever immediately
follows, so if the next declaration is public, we must explicitly
document it, so YARD properly ignores the `rubocop:disable` comment.

lib/rubocop/ast/node.rb

@@ -557,8 +557,7 @@ def guard_clause?
       # So, does the return value of this node matter? If we changed it to
       # `(...; nil)`, might that affect anything?
       #
-      # rubocop:disable Metrics/MethodLength
-      def value_used?
+      def value_used? # rubocop:disable Metrics/MethodLength
         # Be conservative and return true if we're not sure.
         return false if parent.nil?
 
@@ -579,7 +578,6 @@ def value_used?
           true
         end
       end
-      # rubocop:enable Metrics/MethodLength
 
       # Some expressions are evaluated for their value, some for their side
       # effects, and some for both.

lib/rubocop/ast/node_pattern/compiler/binding.rb

@@ -26,8 +26,9 @@ def bind(name)
             var
           end
 
-          # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
-          def union_bind(enum)
+          # Yields for each branch of the given union, forbidding unification of
+          # bindings which only appear in a subset of the union.
+          def union_bind(enum) # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
             # We need to reset @bound before each branch is processed.
             # Moreover we need to keep track of newly encountered wildcards.
             # Var `newly_bound_intersection` will hold those that are encountered
@@ -62,7 +63,6 @@ def union_bind(enum)
 
             result
           end
-          # rubocop:enable Metrics/MethodLength, Metrics/AbcSize
 
           private
 

lib/rubocop/ast/node_pattern/compiler/sequence_subcompiler.rb

@@ -13,8 +13,8 @@ class Compiler
         # Doc on how this fits in the compiling process:
         #   /docs/modules/ROOT/pages/node_pattern.adoc
         #
-        # rubocop:disable Metrics/ClassLength
-        class SequenceSubcompiler < Subcompiler
+        class SequenceSubcompiler < Subcompiler # rubocop:disable Metrics/ClassLength
+          # Shift of 1 from standard Ruby indices
           DELTA = 1
           POSITIVE = :positive?.to_proc
           private_constant :POSITIVE
@@ -413,7 +413,6 @@ def merge_forks!(forks)
             @in_sync = sub_compilers.all?(&:in_sync)
           end
         end
-        # rubocop:enable Metrics/ClassLength
       end
     end
   end

lib/rubocop/ast/processed_source.rb

@@ -2,13 +2,12 @@
 
 require 'digest/sha1'
 
-# rubocop:disable Metrics/ClassLength
 module RuboCop
   module AST
     # ProcessedSource contains objects which are generated by Parser
     # and other information such as disabled lines for cops.
     # It also provides a convenient way to access source lines.
-    class ProcessedSource
+    class ProcessedSource # rubocop:disable Metrics/ClassLength
       # @api private
       STRING_SOURCE_NAME = '(string)'
 
@@ -236,8 +235,7 @@ def tokenize(parser)
         [ast, comments, tokens]
       end
 
-      # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength
-      def parser_class(ruby_version, parser_engine)
+      def parser_class(ruby_version, parser_engine) # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength
         case parser_engine
         when :parser_whitequark
           case ruby_version
@@ -307,7 +305,6 @@ def parser_class(ruby_version, parser_engine)
           end
         end
       end
-      # rubocop:enable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength
 
       def create_parser(ruby_version, parser_engine)
         builder = RuboCop::AST::Builder.new
@@ -345,4 +342,3 @@ def source_range(range_or_node)
     end
   end
 end
-# rubocop:enable Metrics/ClassLength