stevenbristol/instance_eval and class_eval 2.rb

## instance_eval and class_eval 2.rb
"string2".instance_eval { p self }   # => "string2"
begin
  "string2".class_eval { p self }
rescue Exception  => e
  p e                               # => #<NoMethodError: undefined method `class_eval' for "string2":String>
end
	"string2".instance_eval { p self } # => "string2"
	begin
	"string2".class_eval { p self }
	rescue Exception => e
	p e # => #<NoMethodError: undefined method `class_eval' for "string2":String>
	end