class RSpec::Matchers::BuiltIn::ChangeToValue

(and, optionally, from a specific value).
Used to specify a change to a specific value
@api private

def change_description 

def change_description
  "to #{description_of @expected_after}#{@description_suffix}"
end

def does_not_match?(_event_proc)

Other tags:
    Private: - 
def does_not_match?(_event_proc)
  raise NotImplementedError, "`expect { }.not_to change { }.to()` " \
    "is not supported"
end

def from(value)

Other tags:
    Api: - public 
def from(value)
  @expected_before    = value
  @description_suffix = " from #{description_of value}"
  self
end

def initialize(change_details, expected_after) 

def initialize(change_details, expected_after)
  @description_suffix = nil
  super(change_details, MATCH_ANYTHING, expected_after)
end