Enable formula path helper cop

Library/.rubocop.yml

@@ -71,12 +71,6 @@ Homebrew/CompactBlank:
     # `blank?` is not necessarily available here:
     - "Homebrew/extend/enumerable.rb"
 
-Homebrew/FormulaPathMethods:
-  Exclude:
-    # TODO: Remove this after Homebrew/core has applied formula autocorrections.
-    - "/**/Formula/**/*.rb"
-    - "**/Formula/**/*.rb"
-
 Homebrew/NoFileutilsRmrf:
   Include:
     - "/**/{Formula,Casks}/**/*.rb"

Library/Homebrew/service.rb

@@ -3,6 +3,7 @@
 
 require "ipaddr"
 require "on_system"
+require "utils/path"
 require "utils/service"
 
 module Homebrew
@@ -12,6 +13,7 @@ module Homebrew
   class Service
     extend Forwardable
     include OnSystem::MacOSAndLinux
+    include Utils::Path
 
     RUN_TYPE_IMMEDIATE = :immediate
     RUN_TYPE_INTERVAL = :interval

Library/Homebrew/test/service_spec.rb

@@ -44,6 +44,18 @@ def stub_formula_with_service_sockets(sockets_var)
     end
   end
 
+  describe "#formula_opt_bin" do
+    it "is available in service blocks" do
+      f = stub_formula do
+        service do
+          run formula_opt_bin("foo")/"foo"
+        end
+      end
+
+      expect(f.service.run).to eq([(HOMEBREW_PREFIX/"opt/foo/bin/foo").to_s])
+    end
+  end
+
   describe "#process_type" do
     it "throws for unexpected type" do
       f = stub_formula do