Silence warnings

Library/Homebrew/requirements/python_dependency.rb

@@ -18,7 +18,7 @@ class PythonInstalled < Requirement
   attr_reader :if3then3
   attr_reader :imports
   attr_accessor :site_packages
-  attr_accessor :binary # The python.rb formula needs to set the binary
+  attr_writer :binary # The python.rb formula needs to set the binary
 
   fatal true  # you can still make Python optional by `depends_on :python => :optional`
 

Library/Homebrew/test/test_formula_validation.rb

@@ -9,7 +9,7 @@ class FormulaValidationTests < Test::Unit::TestCase
 
   def test_cant_override_brew
     e = assert_raises(RuntimeError) { Class.new(Formula) { def brew; end } }
-    assert_match /You cannot override Formula#brew/, e.message
+    assert_match %r{You cannot override Formula#brew}, e.message
   end
 
   def test_validates_name

Library/Homebrew/test/test_pathname.rb

@@ -64,11 +64,11 @@ class PathnameExtensionTests < Test::Unit::TestCase
 
     @file.cp(@dir)
     assert @file.file?
-    assert (@dir+@file.basename).file?
+    assert((@dir+@file.basename).file?)
 
     @dir.cp(@dst)
     assert @dir.directory?
-    assert (@dst+@dir.basename).directory?
+    assert((@dst+@dir.basename).directory?)
   end
 
   def test_ensure_writable