Eliminate Pathname extensions

activesupport/lib/active_support/core_ext/exception.rb

@@ -1,13 +1,19 @@
-require 'active_support/core_ext/pathname'
-
 module ActiveSupport
   FrozenObjectError = RUBY_VERSION < '1.9' ? TypeError : RuntimeError
 end
 
 # TODO: Turn all this into using the BacktraceCleaner.
 class Exception # :nodoc:
+  # Clean the paths contained in the message.
+  def self.clean_paths(string)
+    require 'pathname' unless defined? Pathname
+    string.gsub(%r{[\w. ]+(/[\w. ]+)+(\.rb)?(\b|$)}) do |path|
+      Pathname.new(path).cleanpath
+    end
+  end
+
   def clean_message
-    Pathname.clean_within message
+    Exception.clean_paths(message)
   end
 
   TraceSubstitutions = []
@@ -16,9 +22,10 @@ def clean_message
 
   def clean_backtrace
     backtrace.collect do |line|
-      Pathname.clean_within(TraceSubstitutions.inject(line) do |result, (regexp, sub)|
+      substituted = TraceSubstitutions.inject(line) do |result, (regexp, sub)|
         result.gsub regexp, sub
-      end)
+      end
+      Exception.clean_paths(substituted)
     end
   end