* lib/rake: Import Rake 0.9.2

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rake/invocation_exception_mixin.rb

@@ -0,0 +1,16 @@
+module Rake
+  module InvocationExceptionMixin
+    # Return the invocation chain (list of Rake tasks) that were in
+    # effect when this exception was detected by rake.  May be null if
+    # no tasks were active.
+    def chain
+      @rake_invocation_chain ||= nil
+    end
+
+    # Set the invocation chain in effect when this exception was
+    # detected.
+    def chain=(value)
+      @rake_invocation_chain = value
+    end
+  end
+end