Use result of lambda type of implicit in CheckUnused #23497
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Fixes #23494
When inspecting unused implicit parameters, the check skips parameters which are "marker traits". It tests for any members of the type (or its upper bound) which are not "universal members". This commit uses the
resultTypeto avoid an errorwhile computing members where the type is a
LambdaType.A future improvement would be not to request
allMembers, since the check only needs to find one that is not universal.The necessitating change was 2e4bc0a.