2 files changed, 30 insertions, 6 deletions
diff --git a/Library/Homebrew/rubocops/lines_cop.rb b/Library/Homebrew/rubocops/lines_cop.rb
index 6c0c3ec73..d6dba9061 100644
--- a/Library/Homebrew/rubocops/lines_cop.rb
+++ b/Library/Homebrew/rubocops/lines_cop.rb
@@ -297,12 +297,12 @@ module RuboCop
             problem "Don't negate 'build.without?': use 'build.with?'"
           end
 
-          # find_instance_method_call(body_node, :build, :without?) do |m|
-          #   arg = parameters(m).first
-          #   next unless match = regex_match_group(arg, %r{-?-?without-(.*)})
-          #   problem "Don't duplicate 'without': Use `build.without? \"#{match[1]}\"` to check for \"--without-#{match[1]}\""
-          # end
-          #
+          find_instance_method_call(body_node, :build, :without?) do |m|
+            arg = parameters(m).first
+            next unless match = regex_match_group(arg, %r{-?-?without-(.*)})
+            problem "Don't duplicate 'without': Use `build.without? \"#{match[1]}\"` to check for \"--without-#{match[1]}\""
+          end
+
           # find_instance_method_call(body_node, :build, :with?) do |m|
           #   arg = parameters(m).first
           #   next unless match = regex_match_group(arg, %r{-?-?with-(.*)})
diff --git a/Library/Homebrew/test/rubocops/lines_cop_spec.rb b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
index e00834963..0c225a5b6 100644
--- a/Library/Homebrew/test/rubocops/lines_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
@@ -715,6 +715,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
         expect_offense(expected, actual)
       end
     end
+
+    it "with negated build.with?" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          def post_install
+            return if build.without? "--without-bar"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Don't duplicate 'without': Use `build.without? \"bar\"` to check for \"--without-bar\"",
+                              severity: :convention,
+                              line: 5,
+                              column: 30,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
   end
   def expect_offense(expected, actual)
     expect(actual.message).to eq(expected[:message])