add test for [ruby-dev:31472].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_block.rb

@@ -432,4 +432,13 @@ assert_equal 'ok', %q{
     :ng
   end
 }, '[ruby-dev:31464]'
+assert_equal 'ok', %q{
+  begin
+    lambda{|&b|}.call(3)
+  rescue ArgumentError
+    :ok
+  else
+    :ng
+  end
+}, '[ruby-dev:31472]'