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silences "possibly useless use of :: in void context" warnings
The AS utility silence_warnings does not really silence this one, because it is issued at parse-time. It seemed to in some places because the constant was the only expression in the block and therefore it was its return value, that could potentially be used by silence_warnings are return value of the yield call. To bypass the warning we assign to a variable. The chosen variable is "_" because it is special-cased in parse.c not to issue an "assigned but unused variable" warning in turn.
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