lean4-htt/tests/elab/wfUnfold.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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module
import all Init.Data.Array.Basic
public def fib : Nat → Nat
| 0 => 0
| 1 => 1
| n+2 => fib n + fib (n+1)
termination_by n => n
/--
error: Failed: `fail` tactic was invoked
⊢ fib 8 + fib (8 + 1) = 55
-/
#guard_msgs in
example : fib 10 = 55 := by
unfold fib
fail
public def ack : Nat → Nat → Nat
| 0, m => m + 1
| n+1, 0 => ack n 1
| n+1, m+1 => ack n (ack (n+1) m)
termination_by n m => (n, m)
/--
error: Failed: `fail` tactic was invoked
⊢ ack 1 (ack (1 + 1) 1) = 7
-/
#guard_msgs in
example : ack 2 2 = 7 := by
unfold ack
fail
-- This checks that we can unfold definitions in the prelude
/--
error: Failed: `fail` tactic was invoked
α : Type u_1
as : Array α
i : Nat
j : Fin as.size
⊢ (if i < ↑j then
let j' := ⟨↑j - 1, ⋯⟩;
let as_1 := as.swap ↑j' ↑j ⋯ ⋯;
insertIdx.loop i as_1 ⟨↑j', ⋯⟩
else as).size =
as.size
-/
#guard_msgs in
@[simp] private theorem Array.size_insertIdx_loop (as : Array α) (i : Nat) (j : Fin as.size) :
(insertIdx.loop i as j).size = as.size := by
unfold insertIdx.loop
fail
public theorem fib_eq_fib (n : Nat) : n ≤ fib (n + 2) :=
match h : n with
| 0 => by simp [fib]
| 1 => by simp [fib]
| n+2 => by
have := fib_eq_fib n
have := fib_eq_fib (n+1)
simp only [fib] at *
omega
termination_by n
-- This should not exist!
/-- error: Unknown constant `fib_eq_fib.eq_def` -/
#guard_msgs in
#check fib_eq_fib.eq_def