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December 14, 2015 06:49
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Possible bug in Agda? This program gives me a stack overflow when I try to load it.
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| module Bug where | |
| data ℕ : Set where | |
| zero : ℕ | |
| suc : ℕ → ℕ | |
| data _≡_ {A : Set}(x : A) : A → Set where | |
| refl : x ≡ x | |
| cong : ∀ {A : Set} {B : Set} | |
| (f : A → B) {x y} → x ≡ y → f x ≡ f y | |
| cong f refl = refl | |
| lem : (n : ℕ) → n ≡ n | |
| lem zero = refl | |
| lem (suc n) = cong (λ x → x) (lem (suc n)) |
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In fact, it seems that the last line can be as simple as:
lem (suc n) = cong (λ x → x) (lem {! !})