sort [] = []
        sort ls = merge (sort p) (sort q)
          where (p, q) = split ls

In fact, this function has a bug.

• It never returns

• (Except when the input is empty.)

• (In which case it does return a list of type [a])

• Type checking found an infinite loop bug!

• At compile time!!

• !!!!!!!!!!

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Copyright © 1999,2008 Mark Dominus