module RSpec::Core::FilterManager::BackwardCompatibility

def _warn_deprecated_key(key, updates)

the future.
Emits a deprecation warning for keys that will not be supported in 
def _warn_deprecated_key(key, updates)
  RSpec.deprecate("FilterManager#exclude(#{key.inspect} => #{updates[key].inspect})")
  @exclusions[key] = updates.delete(key)
end

def _warn_deprecated_keys(updates)

if/unless procs.
Supports a use case that probably doesn't exist: overriding the 
def _warn_deprecated_keys(updates)
  _warn_deprecated_key(:unless, updates) if updates.has_key?(:unless)
  _warn_deprecated_key(:if, updates)     if updates.has_key?(:if)
end

def merge(orig, opposite, *updates) 

def merge(orig, opposite, *updates)
  _warn_deprecated_keys(updates.last)
  super
end

def reverse_merge(orig, opposite, *updates) 

def reverse_merge(orig, opposite, *updates)
  _warn_deprecated_keys(updates.last)
  super
end