[ruby/singleton] Fixed double assignment
https://github.com/ruby/singleton/commit/9d3c77a868
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@ -124,7 +124,7 @@ module Singleton
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end
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def instance # :nodoc:
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@singleton__instance__ || @singleton__mutex__.synchronize { @singleton__instance__ ||= set_instance(new) }
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@singleton__instance__ || @singleton__mutex__.synchronize { @singleton__instance__ ||= new }
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end
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private
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