do not mind excepction class
do not mind excepction class

It should be `TypeError` as other methods, but `Date#<<` misses
the check.

sgarciac/spec,kachick/rubyspec,eregon/rubyspec,eregon/rubyspec,kachick/rubyspec,nobu/rubyspec,sgarciac/spec,ruby/spec,eregon/rubyspec,nobu/rubyspec,ruby/spec,kachick/rubyspec,ruby/spec,sgarciac/spec,ruby/rubyspec,ruby/rubyspec,wied03/rubyspec,wied03/rubyspec,nobu/rubyspec,wied03/rubyspec