fails:Kernel#caller can be called with a range whose end is negative
fails:Kernel#caller must return the same locations when called with 1..-1 and when called with no arguments
windows:Kernel#caller returns an Array with the block given to #at_exit at the base of the stack
fails:Kernel#caller includes core library methods defined in Ruby
fails:Kernel#caller does not include core library methods defined in Ruby
