[BUGFIX release] Ensure that it is possible to experiment with syntax. #15208
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This corrects an issue in 2.13 where
experimentalMacros
was being cleared once each callback had been ran once therefore making it impossible to add syntax that work across multiple tests.This also adds a test to excercise the
registerMacros
concept, just to make sure that we maintain the general capability (though the APIs can certainly change).