20 lines
600 B
Text
20 lines
600 B
Text
def some_lets : ℕ → ℕ → ℕ
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| 0 v := v
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| (nat.succ n) v := let k := some_lets n v + some_lets n v in some_lets n k
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def some_unfolded_lets (n : ℕ) : Σ' v : ℕ , v = some_lets 5 n :=
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begin
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constructor; unfold some_lets; constructor
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end
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meta def foo : tactic unit :=
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do [g] <- tactic.get_goals,
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tactic.to_expr (``(1)) >>= tactic.unify g
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def some_lifted_lets (n : ℕ) : Σ' (v : ℕ), v = psigma.fst (some_unfolded_lets n) :=
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begin
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constructor; unfold some_unfolded_lets psigma.fst; symmetry; transitivity; symmetry;
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{
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foo -- unify_reify_rhs_to_let_in
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}
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end
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