Remove unused variables

Library/Homebrew/cmd/audit.rb

@@ -118,8 +118,6 @@ class FormulaAuditor
   end
 
   def audit_deps
-    problems = []
-
     # Don't depend_on aliases; use full name
     aliases = Formula.aliases
     f.deps.select { |d| aliases.include? d.name }.each do |d|
@@ -163,8 +161,8 @@ class FormulaAuditor
   def audit_conflicts
     f.conflicts.each do |req|
       begin
-        conflict_f = Formula.factory req.formula
-      rescue
+        Formula.factory req.formula
+      rescue FormulaUnavailableError
         problem "Can't find conflicting formula \"#{req.formula}\"."
       end
     end

Library/Homebrew/cmd/cleanup.rb

@@ -11,7 +11,7 @@ module Homebrew extend self
         HOMEBREW_CELLAR.children.each do |rack|
           begin
             cleanup_formula rack.basename.to_s if rack.directory?
-          rescue FormulaUnavailableError => e
+          rescue FormulaUnavailableError
             # Don't complain about Cellar folders that are from DIY installs
             # instead of core formulae.
           end

Library/Homebrew/cmd/update.rb

@@ -25,7 +25,6 @@ module Homebrew extend self
     master_updater.pull!
     report.merge!(master_updater.report)
 
-    new_files = []
     Dir["Library/Taps/*"].each do |tapd|
       next unless File.directory?(tapd)
 

Library/Homebrew/formula.rb

@@ -228,7 +228,7 @@ class Formula
         # we allow formulae to do anything they want to the Ruby process
         # so load any deps before this point! And exit asap afterwards
         yield self
-      rescue RuntimeError, SystemCallError => e
+      rescue RuntimeError, SystemCallError
         %w(config.log CMakeCache.txt).each do |fn|
           (HOMEBREW_LOGS/name).install(fn) if File.file?(fn)
         end
@@ -294,7 +294,7 @@ class Formula
     names.each do |name|
       yield begin
         Formula.factory(name)
-      rescue => e
+      rescue
         # Don't let one broken formula break commands. But do complain.
         onoe "Failed to import: #{name}"
         next
@@ -543,7 +543,7 @@ protected
       mkdir_p(logd)
 
       rd, wr = IO.pipe
-      pid = fork do
+      fork do
         rd.close
         $stdout.reopen wr
         $stderr.reopen wr
@@ -570,7 +570,7 @@ protected
         raise ErrorDuringExecution
       end
     end
-  rescue ErrorDuringExecution => e
+  rescue ErrorDuringExecution
     raise BuildError.new(self, cmd, args, $?)
   ensure
     f.close if f and not f.closed?

Library/Homebrew/formula_installer.rb

@@ -219,7 +219,7 @@ class FormulaInstaller
     if f.keg_only?
       begin
         Keg.new(f.prefix).optlink
-      rescue Exception => e
+      rescue Exception
         onoe "Failed to create: #{f.opt_prefix}"
         puts "Things that depend on #{f} will probably not build."
       end
@@ -302,7 +302,7 @@ class FormulaInstaller
 
     Tab.create(f, build_argv).write # INSTALL_RECEIPT.json
 
-  rescue Exception => e
+  rescue Exception
     ignore_interrupts do
       # any exceptions must leave us with nothing installed
       f.prefix.rmtree if f.prefix.directory?

Library/Homebrew/test/test_formula.rb

@@ -54,7 +54,7 @@ class FormulaTests < Test::Unit::TestCase
     HOMEBREW_CACHE.mkpath unless HOMEBREW_CACHE.exist?
     nostdout do
       f = TestBallWithMirror.new
-      tarball, downloader = f.fetch
+      _, downloader = f.fetch
       assert_equal f.url, "file:///#{TEST_FOLDER}/bad_url/testball-0.1.tbz"
       assert_equal downloader.url, "file:///#{TEST_FOLDER}/tarballs/testball-0.1.tbz"
     end

Library/Homebrew/test/test_versions.rb

@@ -60,7 +60,7 @@ class VersionParsingTests < Test::Unit::TestCase
   end
 
   def test_bad_version
-    assert_raises(RuntimeError) { f = TestBadVersion.new }
+    assert_raises(RuntimeError) { TestBadVersion.new }
   end
 
   def test_version_all_dots