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It is permitted to have more than one clause accumulate into the same variable, as in the following:
(iter (for i from 1 to 10)
(collect i into nums)
(collect (sqrt i) into nums)
(finally (return nums)))
Clauses can only accumulate into the same variable if they are
compatible. collect, adjoining, appending,
nconcing, unioning and nunioning are compatible
with each other; sum, multiply and counting are
compatible; always and never are compatible;
finding... such-that is compatible with either
thereis or always and never when their defaults
match; and maximize and minimize clauses are compatible
only with other maximize and minimize clauses,
respectively.