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It seems to me that the three kinds of expressions proposed are completely orthogonal. Then why should they all be put in one SRFI? It forces an implementation to implement all 3 to be able to claim (cond-expand (srfi-11 'yes)). An implementor might just implement case-lambda, and a user might just be interested in case-lambda, but they can't convey this information to each other through cond-expand. Marc