rbi: Add RactorLocalSingleton #8825
Merged
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Motivation
Fixes #8822
It looks like the
singleton
gem added a new module which is a subclassof
SingletonClassMethods
:It's not documented and the feature seems to have been accepted in the
face of pushback but we may as well have RBI definitions for it so that
it doesn't generate a hidden-definitions error.
Test plan
Have not tested