750f6d5a43
see issue #492 The user-defined recursors will also be used to implement the blast tactic
7 lines
856 B
Text
7 lines
856 B
Text
urec.lean:3:0: error: invalid user defined recursor, result type must be of the form (C i t), where C and t are bound variables, and i is a (possibly empty) sequence of bound variables
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urec.lean:5:0: error: invalid user defined recursor, 'nat.rec' is a builtin recursor
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urec.lean:19:0: error: invalid user defined recursor, motive 'C' must have a type of the form (C : Pi (i : B A), I A i -> Type), where A is (possibly empty) sequence of bound variables (aka parameters), (i : B A) is a (possibly empty) telescope (aka indices), and I is a constant
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urec.lean:23:0: error: invalid user defined recursor, resultant type of minor premise 'a' must be of the form (M ...)
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myrec.{l_1 l_2} :
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Π (A : Type.{l_1}) (M : list.{l_1} A → Type.{l_2}) (l : list.{l_1} A),
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M (@nil.{l_1} A) → (Π (a : A), M [a]) → (Π (a₁ a₂ : A), M [a₁, a₂]) → M l
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