diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index f4c1604ff7..2792594c60 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -163,6 +163,10 @@ Performance/CaseWhenSplat:
 Performance/Caller:
   Enabled: false
 
+# Makes code less readable for minor performance increases.
+Performance/MethodObjectAsBlock:
+  Enabled: false
+
 # Don't allow cops to be disabled in casks and formulae.
 Style/DisableCopsWithinSourceCodeDirective:
   Enabled: true
diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index 92f28cb702..da73e98755 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -22,7 +22,7 @@ module Cask
     attr_reader :token, :sourcefile_path, :config, :default_config
 
     def self.each(&block)
-      return to_enum unless block_given?
+      return to_enum unless block
 
       Tap.flat_map(&:cask_files).each do |f|
         block.call CaskLoader::FromTapPathLoader.new(f).load(config: nil)
diff --git a/Library/Homebrew/cask/cmd.rb b/Library/Homebrew/cask/cmd.rb
index cee4589519..16c5d30a6f 100644
--- a/Library/Homebrew/cask/cmd.rb
+++ b/Library/Homebrew/cask/cmd.rb
@@ -84,7 +84,7 @@ module Cask
 
     def self.parser(&block)
       Homebrew::CLI::Parser.new do
-        if block_given?
+        if block
           instance_eval(&block)
         else
           usage_banner <<~EOS
diff --git a/Library/Homebrew/cask/cmd/abstract_command.rb b/Library/Homebrew/cask/cmd/abstract_command.rb
index fe57b597c8..afa69cc2fa 100644
--- a/Library/Homebrew/cask/cmd/abstract_command.rb
+++ b/Library/Homebrew/cask/cmd/abstract_command.rb
@@ -68,7 +68,7 @@ module Cask
         Cmd.parser do
           usage_banner banner
 
-          instance_eval(&block) if block_given?
+          instance_eval(&block) if block
 
           OPTIONS.each do |option|
             send(*option)
diff --git a/Library/Homebrew/cask/cmd/install.rb b/Library/Homebrew/cask/cmd/install.rb
index 6dceac2767..c2dc60105f 100644
--- a/Library/Homebrew/cask/cmd/install.rb
+++ b/Library/Homebrew/cask/cmd/install.rb
@@ -34,7 +34,7 @@ module Cask
             send(*option)
           end
 
-          instance_eval(&block) if block_given?
+          instance_eval(&block) if block
         end
       end
 
diff --git a/Library/Homebrew/cask/dsl.rb b/Library/Homebrew/cask/dsl.rb
index f0abafa93a..149fedb7de 100644
--- a/Library/Homebrew/cask/dsl.rb
+++ b/Library/Homebrew/cask/dsl.rb
@@ -125,7 +125,7 @@ module Cask
     def language(*args, default: false, &block)
       if args.empty?
         language_eval
-      elsif block_given?
+      elsif block
         @language_blocks ||= {}
         @language_blocks[args] = block
 
@@ -248,7 +248,7 @@ module Cask
 
     def caveats(*strings, &block)
       @caveats ||= DSL::Caveats.new(cask)
-      if block_given?
+      if block
         @caveats.eval_caveats(&block)
       elsif strings.any?
         strings.each do |string|
diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index 6ff29d5a37..d9ebb5e01d 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -136,7 +136,7 @@ module Homebrew
           switch short, long, description: desc, env: option_to_name(long), method: :on_tail
         end
 
-        instance_eval(&block) if block_given?
+        instance_eval(&block) if block
       end
 
       def switch(*names, description: nil, env: nil, required_for: nil, depends_on: nil, method: :on)
diff --git a/Library/Homebrew/compilers.rb b/Library/Homebrew/compilers.rb
index c8a9dfe584..8881c84133 100644
--- a/Library/Homebrew/compilers.rb
+++ b/Library/Homebrew/compilers.rb
@@ -56,7 +56,7 @@ class CompilerFailure
   def initialize(name, version, &block)
     @name = name
     @version = Version.parse(version.to_s)
-    instance_eval(&block) if block_given?
+    instance_eval(&block) if block
   end
 
   def fails_with?(compiler)
diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index aa22361478..21a7d7e78c 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -120,9 +120,9 @@ class Dependency
       @expand_stack.pop
     end
 
-    def action(dependent, dep, &_block)
+    def action(dependent, dep, &block)
       catch(:action) do
-        if block_given?
+        if block
           yield dependent, dep
         elsif dep.optional? || dep.recommended?
           prune unless dependent.build.with?(dep)
diff --git a/Library/Homebrew/extend/os/linux/formula.rb b/Library/Homebrew/extend/os/linux/formula.rb
index fdcecb20d2..29ff3dd802 100644
--- a/Library/Homebrew/extend/os/linux/formula.rb
+++ b/Library/Homebrew/extend/os/linux/formula.rb
@@ -4,8 +4,8 @@
 class Formula
   undef on_linux
 
-  def on_linux(&_block)
-    raise "No block content defined for on_linux block" unless block_given?
+  def on_linux(&block)
+    raise "No block content defined for on_linux block" unless block
 
     yield
   end
@@ -19,8 +19,8 @@ class Formula
   class << self
     undef on_linux
 
-    def on_linux(&_block)
-      raise "No block content defined for on_linux block" unless block_given?
+    def on_linux(&block)
+      raise "No block content defined for on_linux block" unless block
 
       yield
     end
diff --git a/Library/Homebrew/extend/os/mac/formula.rb b/Library/Homebrew/extend/os/mac/formula.rb
index 3834f8c040..ed9f64a4b4 100644
--- a/Library/Homebrew/extend/os/mac/formula.rb
+++ b/Library/Homebrew/extend/os/mac/formula.rb
@@ -4,8 +4,8 @@
 class Formula
   undef on_macos
 
-  def on_macos(&_block)
-    raise "No block content defined for on_macos block" unless block_given?
+  def on_macos(&block)
+    raise "No block content defined for on_macos block" unless block
 
     yield
   end
@@ -13,8 +13,8 @@ class Formula
   class << self
     undef on_macos
 
-    def on_macos(&_block)
-      raise "No block content defined for on_macos block" unless block_given?
+    def on_macos(&block)
+      raise "No block content defined for on_macos block" unless block
 
       yield
     end
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 26b0846459..eaed557009 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -282,7 +282,7 @@ class Formula
   # and is specified to this instance.
   def installed_alias_path
     path = build.source["path"] if build.is_a?(Tab)
-    return unless path&.match?(%r{#{HOMEBREW_TAP_DIR_REGEX}/Aliases})
+    return unless path&.match?(%r{#{HOMEBREW_TAP_DIR_REGEX}/Aliases}o)
     return unless File.symlink?(path)
 
     path
@@ -1384,16 +1384,16 @@ class Formula
   # <pre>on_macos do
   # # Do something Mac-specific
   # end</pre>
-  def on_macos(&_block)
-    raise "No block content defined for on_macos block" unless block_given?
+  def on_macos(&block)
+    raise "No block content defined for on_macos block" unless block
   end
 
   # Block only executed on Linux. No-op on macOS.
   # <pre>on_linux do
   # # Do something Linux-specific
   # end</pre>
-  def on_linux(&_block)
-    raise "No block content defined for on_linux block" unless block_given?
+  def on_linux(&block)
+    raise "No block content defined for on_linux block" unless block
   end
 
   # Standard parameters for cargo builds.
@@ -2118,7 +2118,7 @@ class Formula
   # a block.
   def mkdir(name, &block)
     result = FileUtils.mkdir_p(name)
-    return result unless block_given?
+    return result unless block
 
     FileUtils.chdir(name, &block)
   end
@@ -2458,7 +2458,7 @@ class Formula
     # end</pre>
     def stable(&block)
       @stable ||= SoftwareSpec.new(flags: build_flags)
-      return @stable unless block_given?
+      return @stable unless block
 
       @stable.instance_eval(&block)
     end
@@ -2482,7 +2482,7 @@ class Formula
     # <pre>head "https://hg.is.awesome.but.git.has.won.example.com/", using: :hg</pre>
     def head(val = nil, specs = {}, &block)
       @head ||= HeadSoftwareSpec.new(flags: build_flags)
-      if block_given?
+      if block
         @head.instance_eval(&block)
       elsif val
         @head.url(val, specs)
@@ -2553,16 +2553,16 @@ class Formula
     # <pre>on_macos do
     #   depends_on "mac_only_dep"
     # end</pre>
-    def on_macos(&_block)
-      raise "No block content defined for on_macos block" unless block_given?
+    def on_macos(&block)
+      raise "No block content defined for on_macos block" unless block
     end
 
     # Block only executed on Linux. No-op on macOS.
     # <pre>on_linux do
     #   depends_on "linux_only_dep"
     # end</pre>
-    def on_linux(&_block)
-      raise "No block content defined for on_linux block" unless block_given?
+    def on_linux(&block)
+      raise "No block content defined for on_linux block" unless block
     end
 
     # @!attribute [w] option
@@ -2757,7 +2757,7 @@ class Formula
     # end</pre>
     def livecheck(&block)
       @livecheck ||= Livecheck.new(self)
-      return @livecheck unless block_given?
+      return @livecheck unless block
 
       @livecheckable = true
       @livecheck.instance_eval(&block)
diff --git a/Library/Homebrew/language/python.rb b/Library/Homebrew/language/python.rb
index 5b44de4412..165ee1da28 100644
--- a/Library/Homebrew/language/python.rb
+++ b/Library/Homebrew/language/python.rb
@@ -270,7 +270,7 @@ module Language
             next unless f.symlink?
             next unless (rp = f.realpath.to_s).start_with? HOMEBREW_CELLAR
 
-            version = rp.match %r{^#{HOMEBREW_CELLAR}/python@(.*?)/}
+            version = rp.match %r{^#{HOMEBREW_CELLAR}/python@(.*?)/}o
             version = "@#{version.captures.first}" unless version.nil?
 
             new_target = rp.sub %r{#{HOMEBREW_CELLAR}/python#{version}/[^/]+}, Formula["python#{version}"].opt_prefix
@@ -281,7 +281,7 @@ module Language
           Pathname.glob(@venv_root/"lib/python*/orig-prefix.txt").each do |prefix_file|
             prefix_path = prefix_file.read
 
-            version = prefix_path.match %r{^#{HOMEBREW_CELLAR}/python@(.*?)/}
+            version = prefix_path.match %r{^#{HOMEBREW_CELLAR}/python@(.*?)/}o
             version = "@#{version.captures.first}" unless version.nil?
 
             prefix_path.sub! %r{^#{HOMEBREW_CELLAR}/python#{version}/[^/]+}, Formula["python#{version}"].opt_prefix
diff --git a/Library/Homebrew/linkage_checker.rb b/Library/Homebrew/linkage_checker.rb
index d1a898cfd6..ef189d011d 100644
--- a/Library/Homebrew/linkage_checker.rb
+++ b/Library/Homebrew/linkage_checker.rb
@@ -129,7 +129,7 @@ class LinkageChecker
   private
 
   def dylib_to_dep(dylib)
-    dylib =~ %r{#{Regexp.escape(HOMEBREW_PREFIX)}/(opt|Cellar)/([\w+-.@]+)/}
+    dylib =~ %r{#{Regexp.escape(HOMEBREW_PREFIX)}/(opt|Cellar)/([\w+-.@]+)/}o
     Regexp.last_match(2)
   end
 
diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index 93863c3086..5078ac7bd7 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -82,7 +82,7 @@ class Requirement
     return unless @satisfied_result.is_a?(Pathname)
 
     parent = @satisfied_result.resolved_path.parent
-    if parent.to_s =~ %r{^#{Regexp.escape(HOMEBREW_CELLAR)}/([\w+-.@]+)/[^/]+/(s?bin)/?$}
+    if parent.to_s =~ %r{^#{Regexp.escape(HOMEBREW_CELLAR)}/([\w+-.@]+)/[^/]+/(s?bin)/?$}o
       parent = HOMEBREW_PREFIX/"opt/#{Regexp.last_match(1)}/#{Regexp.last_match(2)}"
     end
     parent
@@ -168,14 +168,14 @@ class Requirement
     attr_rw :fatal, :cask, :download
 
     def satisfy(options = nil, &block)
-      return @satisfied if options.nil? && !block_given?
+      return @satisfied if options.nil? && !block
 
       options = {} if options.nil?
       @satisfied = Satisfier.new(options, &block)
     end
 
     def env(*settings, &block)
-      if block_given?
+      if block
         @env_proc = block
       else
         super
@@ -236,9 +236,9 @@ class Requirement
       reqs
     end
 
-    def prune?(dependent, req, &_block)
+    def prune?(dependent, req, &block)
       catch(:prune) do
-        if block_given?
+        if block
           yield dependent, req
         elsif req.optional? || req.recommended?
           prune unless dependent.build.with?(req)
diff --git a/Library/Homebrew/resource.rb b/Library/Homebrew/resource.rb
index 7e16b3582e..68c237471a 100644
--- a/Library/Homebrew/resource.rb
+++ b/Library/Homebrew/resource.rb
@@ -32,7 +32,7 @@ class Resource
     @checksum = nil
     @using = nil
     @patches = []
-    instance_eval(&block) if block_given?
+    instance_eval(&block) if block
   end
 
   def owner=(owner)
diff --git a/Library/Homebrew/software_spec.rb b/Library/Homebrew/software_spec.rb
index 14067d5a6e..f5f817ba05 100644
--- a/Library/Homebrew/software_spec.rb
+++ b/Library/Homebrew/software_spec.rb
@@ -107,7 +107,7 @@ class SoftwareSpec
   end
 
   def resource(name, klass = Resource, &block)
-    if block_given?
+    if block
       raise DuplicateResourceError, name if resource_defined?(name)
 
       res = klass.new(name, &block)
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 2eae5745e2..d4a33d8ab7 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -586,7 +586,7 @@ class Tap
   def self.each(&block)
     return unless TAP_DIRECTORY.directory?
 
-    return to_enum unless block_given?
+    return to_enum unless block
 
     TAP_DIRECTORY.subdirs.each do |user|
       user.subdirs.each do |repo|
diff --git a/Library/Homebrew/test/cmd/--cache_spec.rb b/Library/Homebrew/test/cmd/--cache_spec.rb
index 6f8acbb945..c7e9e5dc82 100644
--- a/Library/Homebrew/test/cmd/--cache_spec.rb
+++ b/Library/Homebrew/test/cmd/--cache_spec.rb
@@ -10,14 +10,14 @@ end
 describe "brew --cache", :integration_test do
   it "prints all cache files for a given Formula" do
     expect { brew "--cache", testball }
-      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}--testball-}).to_stdout
+      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}--testball-}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
 
   it "prints the cache files for a given Cask" do
     expect { brew "--cache", cask_path("local-caffeine") }
-      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}--caffeine\.zip}).to_stdout
+      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}--caffeine\.zip}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
@@ -28,7 +28,7 @@ describe "brew --cache", :integration_test do
         %r{
           #{HOMEBREW_CACHE}/downloads/[\da-f]{64}--testball-.*\n
           #{HOMEBREW_CACHE}/downloads/[\da-f]{64}--caffeine\.zip
-        }x,
+        }xo,
       ).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
diff --git a/Library/Homebrew/test/cmd/--cellar_spec.rb b/Library/Homebrew/test/cmd/--cellar_spec.rb
index 1bda2bd9f9..c558c684a8 100644
--- a/Library/Homebrew/test/cmd/--cellar_spec.rb
+++ b/Library/Homebrew/test/cmd/--cellar_spec.rb
@@ -10,7 +10,7 @@ end
 describe "brew --cellar", :integration_test do
   it "returns the Cellar subdirectory for a given Formula" do
     expect { brew "--cellar", testball }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
diff --git a/Library/Homebrew/test/cmd/--prefix_spec.rb b/Library/Homebrew/test/cmd/--prefix_spec.rb
index 527581f5f5..95ac7bb042 100644
--- a/Library/Homebrew/test/cmd/--prefix_spec.rb
+++ b/Library/Homebrew/test/cmd/--prefix_spec.rb
@@ -10,7 +10,7 @@ end
 describe "brew --prefix", :integration_test do
   it "prints a given Formula's prefix" do
     expect { brew "--prefix", testball }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
diff --git a/Library/Homebrew/test/cmd/--version_spec.rb b/Library/Homebrew/test/cmd/--version_spec.rb
index 7d9d71cd8b..11e91912e8 100644
--- a/Library/Homebrew/test/cmd/--version_spec.rb
+++ b/Library/Homebrew/test/cmd/--version_spec.rb
@@ -10,7 +10,7 @@ end
 describe "brew --version", :integration_test do
   it "prints the Homebrew version" do
     expect { brew "--version" }
-      .to output(/^Homebrew #{Regexp.escape(HOMEBREW_VERSION)}\n/).to_stdout
+      .to output(/^Homebrew #{Regexp.escape(HOMEBREW_VERSION)}\n/o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
diff --git a/Library/Homebrew/test/cmd/cleanup_spec.rb b/Library/Homebrew/test/cmd/cleanup_spec.rb
index 437f8a6277..d1906e5562 100644
--- a/Library/Homebrew/test/cmd/cleanup_spec.rb
+++ b/Library/Homebrew/test/cmd/cleanup_spec.rb
@@ -22,7 +22,7 @@ describe "brew cleanup", :integration_test do
       (HOMEBREW_CACHE/"test").write "test"
 
       expect { brew "cleanup", "--prune=all" }
-        .to output(%r{#{Regexp.escape(HOMEBREW_CACHE)}/test}).to_stdout
+        .to output(%r{#{Regexp.escape(HOMEBREW_CACHE)}/test}o).to_stdout
         .and not_to_output.to_stderr
         .and be_a_success
     end
diff --git a/Library/Homebrew/test/cmd/config_spec.rb b/Library/Homebrew/test/cmd/config_spec.rb
index df5bed7910..843c2a52a5 100644
--- a/Library/Homebrew/test/cmd/config_spec.rb
+++ b/Library/Homebrew/test/cmd/config_spec.rb
@@ -10,7 +10,7 @@ end
 describe "brew config", :integration_test do
   it "prints information about the current Homebrew configuration" do
     expect { brew "config" }
-      .to output(/HOMEBREW_VERSION: #{Regexp.escape HOMEBREW_VERSION}/).to_stdout
+      .to output(/HOMEBREW_VERSION: #{Regexp.escape HOMEBREW_VERSION}/o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
diff --git a/Library/Homebrew/test/cmd/install_spec.rb b/Library/Homebrew/test/cmd/install_spec.rb
index ef100add41..c17cc00ee7 100644
--- a/Library/Homebrew/test/cmd/install_spec.rb
+++ b/Library/Homebrew/test/cmd/install_spec.rb
@@ -12,7 +12,7 @@ describe "brew install", :integration_test do
     setup_test_formula "testball1"
 
     expect { brew "install", "testball1" }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball1/0\.1}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball1/0\.1}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
     expect(HOMEBREW_CELLAR/"testball1/0.1/foo/test").not_to be_a_file
@@ -22,7 +22,7 @@ describe "brew install", :integration_test do
     setup_test_formula "testball1"
 
     expect { brew "install", "testball1", "--with-foo" }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball1/0\.1}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball1/0\.1}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
     expect(HOMEBREW_CELLAR/"testball1/0.1/foo/test").to be_a_file
@@ -36,7 +36,7 @@ describe "brew install", :integration_test do
     RUBY
 
     expect { brew "install", "testball1" }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball1/1\.0}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball1/1\.0}o).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
     expect(HOMEBREW_CELLAR/"testball1/1.0/foo/test").not_to be_a_file
@@ -69,7 +69,7 @@ describe "brew install", :integration_test do
     # and there will be the git requirement, but we cannot instantiate git
     # formula since we only have testball1 formula.
     expect { brew "install", "testball1", "--HEAD", "--ignore-dependencies" }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball1/HEAD-d5eb689}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball1/HEAD-d5eb689}o).to_stdout
       .and output(/Cloning into/).to_stderr
       .and be_a_success
     expect(HOMEBREW_CELLAR/"testball1/HEAD-d5eb689/foo/test").not_to be_a_file
diff --git a/Library/Homebrew/test/dev-cmd/command_spec.rb b/Library/Homebrew/test/dev-cmd/command_spec.rb
index 5e6ecdfbe9..87c9dd61f3 100644
--- a/Library/Homebrew/test/dev-cmd/command_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/command_spec.rb
@@ -10,7 +10,7 @@ end
 describe "brew command", :integration_test do
   it "returns the file for a given command" do
     expect { brew "command", "info" }
-      .to output(%r{#{Regexp.escape(HOMEBREW_LIBRARY_PATH)}/cmd/info.rb}).to_stdout
+      .to output(%r{#{Regexp.escape(HOMEBREW_LIBRARY_PATH)}/cmd/info.rb}o).to_stdout
       .and be_a_success
   end
 end
diff --git a/Library/Homebrew/test/diagnostic_checks_spec.rb b/Library/Homebrew/test/diagnostic_checks_spec.rb
index bd2c17beca..72a23e16d9 100644
--- a/Library/Homebrew/test/diagnostic_checks_spec.rb
+++ b/Library/Homebrew/test/diagnostic_checks_spec.rb
@@ -66,7 +66,7 @@ describe Homebrew::Diagnostic::Checks do
 
   specify "#check_user_path_2" do
     ENV["PATH"] = ENV["PATH"].gsub \
-      %r{(?:^|#{File::PATH_SEPARATOR})#{HOMEBREW_PREFIX}/bin}, ""
+      %r{(?:^|#{File::PATH_SEPARATOR})#{HOMEBREW_PREFIX}/bin}o, ""
 
     expect(subject.check_user_path_1).to be nil
     expect(subject.check_user_path_2)