lean4-htt/tests/elab/subst.lean
Garmelon 08eb78a5b2
chore: switch to new test/bench suite (#12590)
This PR sets up the new integrated test/bench suite. It then migrates
all benchmarks and some related tests to the new suite. There's also
some documentation and some linting.

For now, a lot of the old tests are left alone so this PR doesn't become
even larger than it already is. Eventually, all tests should be migrated
to the new suite though so there isn't a confusing mix of two systems.
2026-02-25 13:51:53 +00:00

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universe u
def f1 (n m : Nat) (x : Fin n) (h : n = m) : Fin m :=
h ▸ x
def f2 (n m : Nat) (x : Fin n) (h : m = n) : Fin m :=
h ▸ x
theorem ex1 {α : Sort u} {a b c : α} (h₁ : a = b) (h₂ : b = c) : a = c :=
h₂ ▸ h₁
theorem ex2 {α : Sort u} {a b : α} (h : a = b) : b = a :=
h ▸ rfl
theorem ex3 {α : Sort u} {a b c : α} (r : αα → Prop) (h₁ : r a b) (h₂ : b = c) : r a c :=
h₂ ▸ h₁
theorem ex3b {α : Sort u} {a b c : α} (r : αα → Prop) (h₁ : r a b) (h₂ : b = c) : r a c :=
h₂.symm ▸ h₁
theorem ex3c {α : Sort u} {a b c : α} (r : αα → Prop) (h₁ : r a b) (h₂ : b = c) : r a c :=
h₂.symm.symm ▸ h₁
theorem ex4 {α : Sort u} {a b c : α} (r : αα → Prop) (h₁ : a = b) (h₂ : r b c) : r a c :=
h₁ ▸ h₂
theorem ex5 {p : Prop} (h : p = True) : p :=
h ▸ trivial
theorem ex6 {p : Prop} (h : p = False) : ¬p :=
fun hp => h ▸ hp
theorem ex7 {α} {a b c d : α} (h₁ : a = c) (h₂ : b = d) (h₃ : c ≠ d) : a ≠ b :=
h₁ ▸ h₂ ▸ h₃
theorem ex8 (n m k : Nat) (h : Nat.succ n + m = Nat.succ n + k) : Nat.succ (n + m) = Nat.succ (n + k) :=
Nat.succ_add .. ▸ Nat.succ_add .. ▸ h
theorem ex9 (a b : Nat) (h₁ : a = a + b) (h₂ : a = b) : a = b + a :=
h₂ ▸ h₁
theorem ex10 (a b : Nat) (h : a = b) : b = a :=
h ▸ rfl
def ex11 {α : Type u} {n : Nat} (a : Array α) (i : Nat) (h₁ : a.size = n) (h₂ : i < n) : α :=
a[i]
theorem ex12 {α : Type u} {n : Nat}
(a b : Array α)
(hsz₁ : a.size = n) (hsz₂ : b.size = n)
(h : ∀ (i : Nat) (hi : i < n), a.getLit i hsz₁ hi = b.getLit i hsz₂ hi) : a = b :=
Array.ext (hsz₁.trans hsz₂.symm) fun i hi₁ hi₂ => h i (hsz₁ ▸ hi₁)
def toArrayLit {α : Type u} (a : Array α) (n : Nat) (hsz : a.size = n) : Array α :=
List.toArray $ Array.toListLitAux a n hsz n (hsz ▸ Nat.le_refl _) []
partial def isEqvAux {α} (a b : Array α) (hsz : a.size = b.size) (p : αα → Bool) (i : Nat) : Bool :=
if h : i < a.size then
let aidx : Fin a.size := ⟨i, h⟩
let bidx : Fin b.size := ⟨i, hsz ▸ h⟩
match p a[aidx] b[bidx] with
| true => isEqvAux a b hsz p (i+1)
| false => false
else
true