lean4-htt/tests/elab/simp6.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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theorem ex1 (a : α) (b : List α) : (a::b = []) = False :=
by simp
theorem ex2 (a : α) (b : List α) : (a::b = []) = False :=
by simp
theorem ex3 (x : Nat) : (if Nat.succ x = 0 then 1 else 2) = 2 :=
by simp
theorem ex4 (x : Nat) : (if 10 = 0 then 1 else 2) = 2 :=
by simp
theorem ex5 : (10 = 20) = False :=
by simp
/--
info: theorem ex5 : (10 = 20) = False :=
of_eq_true (Eq.trans (congrFun' (congrArg Eq (eq_false_of_decide (Eq.refl false))) False) (eq_self False))
-/
#guard_msgs in
#print ex5
theorem ex6 : (if "hello" = "world" then 1 else 2) = 2 :=
by simp (config := { decide := true })
/--
info: theorem ex6 : (if "hello" = "world" then 1 else 2) = 2 :=
of_eq_true (eq_true_of_decide (Eq.refl true))
-/
#guard_msgs in
#print ex6
theorem ex7 : (if "hello" = "world" then 1 else 2) = 2 := by
simp (config := { decide := false }) [-String.reduceEq]
guard_target =ₛ ¬ "hello" = "world"
fail_if_success simp [-String.reduceEq]
simp (config := { decide := true }) [-String.reduceEq]
theorem ex8 : (10 + 2000 = 20) = False :=
by simp
def fact : Nat → Nat
| 0 => 1
| x+1 => (x+1) * fact x
theorem ex9 : (if fact 100 > 10 then true else false) = true :=
by simp (config := { decide := true })