File: value-type-function0.fut

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-- Since we distinguish between value types and lifted types, it
-- should not be possible to instantiate a polymorphic funtion, that
-- uses its (value type) polymorphic arguments in the branches of a
-- conditional, with a function type.
-- ==
-- error: functional

def cond 'a (b : bool) (x : a) (y : a) : a =
  if b then x else y

def main (b : bool) : i32 =
  let f = cond b (\(x:i32) -> x+x) (\(x:i32) -> x)
  in f 42