Merge pull request #1710 from MikeMcQuaid/xcode-no-prerelease-warnings

Remove Xcode prerelease warnings.

Library/Homebrew/extend/os/mac/diagnostic.rb

@@ -4,7 +4,6 @@ module Homebrew
       def development_tools_checks
         %w[
           check_for_unsupported_macos
-          check_for_prerelease_xcode
           check_for_bad_install_name_tool
           check_for_installed_developer_tools
           check_xcode_license_approved
@@ -50,21 +49,6 @@ module Homebrew
         EOS
       end
 
-      def check_for_prerelease_xcode
-        return if ARGV.homebrew_developer?
-        # Running a pre-release Xcode on a pre-release OS is expected
-        # and likely to cause less problems than a stable Xcode will.
-        return if OS::Mac.prerelease?
-        return unless MacOS::Xcode.installed?
-        return unless MacOS::Xcode.prerelease?
-
-        <<-EOS.undent
-          You are using a pre-release version of Xcode.
-          You may encounter build failures or other breakages.
-          Please create pull-requests instead of filing issues.
-        EOS
-      end
-
       def check_xcode_up_to_date
         return unless MacOS::Xcode.installed?
         return unless MacOS::Xcode.outdated?

Library/Homebrew/os/mac/xcode.rb

@@ -36,11 +36,6 @@ module OS
         version < minimum_version
       end
 
-      def prerelease?
-        # TODO: bump to version >= "8.4" after Xcode 8.3 is stable.
-        Version.new(version) >= "8.3"
-      end
-
       def outdated?
         Version.new(version) < latest_version
       end