lean4-htt/tests/elab/funind_fewer_levels.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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/-!
This test checks if the functional induction principle has fewer universe parameters
if the original function has a parameter that disappears.
-/
namespace Structural
def foo.{u} : Nat → PUnit.{u}
| 0 => .unit
| n+1 => foo n
/--
info: Structural.foo.induct (motive : Nat → Prop) (case1 : motive 0) (case2 : ∀ (n : Nat), motive n → motive n.succ)
(a✝ : Nat) : motive a✝
-/
#guard_msgs in
#check foo.induct
example : foo n = .unit := by
induction n using foo.induct with
| case1 => unfold foo; rfl
| case2 n ih => unfold foo; exact ih
end Structural
namespace WellFounded
def foo.{u,v} {α : Type v} : List α → PUnit.{u}
| [] => .unit
| _ :: xs => foo xs
termination_by xs => xs
/--
info: WellFounded.foo.induct.{v} {α : Type v} (motive : List α → Prop) (case1 : motive [])
(case2 : ∀ (head : α) (xs : List α), motive xs → motive (head :: xs)) (a✝ : List α) : motive a✝
-/
#guard_msgs in
#check foo.induct
example : foo xs = .unit := by
induction xs using foo.induct with
| case1 => unfold foo; rfl
| case2 _ xs ih => unfold foo; exact ih
end WellFounded
namespace Mutual
mutual
def foo.{u} : Nat → PUnit.{u}
| 0 => .unit
| n+1 => bar n
termination_by n => n
def bar.{u} : Nat → PUnit.{u}
| 0 => .unit
| n+1 => foo n
termination_by n => n
end
/--
info: Mutual.foo.induct (motive1 motive2 : Nat → Prop) (case1 : motive1 0) (case2 : ∀ (n : Nat), motive2 n → motive1 n.succ)
(case3 : motive2 0) (case4 : ∀ (n : Nat), motive1 n → motive2 n.succ) (a✝ : Nat) : motive1 a✝
-/
#guard_msgs in
#check foo.induct
example : foo n = .unit := by
induction n using foo.induct (motive2 := fun n => bar n = .unit) with
| case1 => unfold foo; rfl
| case2 n ih => unfold foo; exact ih
| case3 => unfold bar; rfl
| case4 n ih => unfold bar; exact ih
end Mutual