Add `then` alias to `yield_self`.

`then' was added in CRuby 2.6.
parent a7c8575f
module Kernel
# call-seq:
# obj.yield_self {|_obj|...} -> an_object
# obj.then {|_obj|...} -> an_object
#
# Yields <i>obj</i> and returns the result.
#
......@@ -10,4 +11,5 @@ module Kernel
return to_enum :yield_self unless block
block.call(self)
end
alias then yield_self
end
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