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Miranda

Miranda is a functional programming language, a little to pure to be any use to me, I'd prefer a hybrid language. Still it's and interesting language, see it's Wikipedia page.

I also do not like the way it uses = in more than one way:
       1) As to assign values.
       2) To define functions.
       3) as an relational operator to test equality.
so you can have function definitions like

mktree list = build (sort list) where
                           build lst = Empty,                              if  lst = []
                                             = Fork left (lst!m) right, otherwise
                                                  where
                                                          left = build (take m lst)
                                                          right = build (drop (m+1) lst)
                                                          m = #lst div 2

which shows = being used to define functions, mktree list = build ..  and build lst = , and then as a equality operator lst = [], and then to assign to left, right and m, this is ugly and ambiguous.
 
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