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lean4/tests/elab/linearNoConfusion.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 tests and also explains the noConfusionType construction.
It contains copies of the definitions of the constructions, for manual experimentation with
the code, and uses `#guard_msgs` and `rfl` to compare them to the generated ones.
This also serves as documentation to the `NoConfusionLinear` module, so do not delete or remove
from this file without updating that module's docstring.
-/
-- set_option debug.skipKernelTC true
-- set_option trace.Meta.mkNoConfusion true
-- set_option trace.Kernel true
-- set_option genInjectivity false
-- set_option trace.Meta.injective true
-- set_option trace.Meta.Tactic.injection true
inductive Vec.{u} (α : Type) : Nat Type u where
| nil : Vec α 0
| cons1 {n} : α Vec α n Vec α (n + 1)
| cons2 {n} : α Vec α n Vec α (n + 1)
@[reducible] protected def Vec.noConfusionType'.{u_1, u} : Sort u_1
{α : Type} {a : Nat} Vec.{u} α a
{α : Type} {a : Nat} Vec α a Sort u_1 :=
fun P _ _ x1 _ _ x2 =>
Vec.casesOn x1
(if h : x2.ctorIdx = 0 then
Vec.nil.elim (motive := fun _ _ => Sort u_1) x2 h (P P)
else P)
(fun {n} a_1 a_2 => if h : x2.ctorIdx = 1 then
Vec.cons1.elim (motive := fun _ _ => Sort u_1) x2 h fun {n_1} a a_3 => (n = n_1 a_1 a a_2 a_3 P) P
else P)
(fun {n} a_1 a_2 => if h : x2.ctorIdx = 2 then
Vec.cons2.elim (motive := fun _ _ => Sort u_1) x2 h fun {n_1} a a_3 => (n = n_1 a_1 a a_2 a_3 P) P
else P)
/--
info: @[reducible] protected def Vec.noConfusionType.{u_1, u} : Sort u_1 →
{α : Type} → {a : Nat} → Vec α a → {α' : Type} → {a' : Nat} → Vec α' a' → Sort u_1 :=
fun P {α} {a} t {α'} {a'} t' =>
Vec.casesOn t (if h : t'.ctorIdx = 0 then Vec.nil.elim t' h (P → P) else P)
(fun {n} a a_1 =>
if h : t'.ctorIdx = 1 then Vec.cons1.elim t' h fun {n_1} a_2 a_3 => (n = n_1 → a ≍ a_2 → a_1 ≍ a_3 → P) → P
else P)
fun {n} a a_1 =>
if h : t'.ctorIdx = 2 then Vec.cons2.elim t' h fun {n_1} a_2 a_3 => (n = n_1 → a ≍ a_2 → a_1 ≍ a_3 → P) → P else P
-/
#guard_msgs in
#print Vec.noConfusionType
example : @Vec.noConfusionType.{u_1,u} = @Vec.noConfusionType'.{u_1,u} := rfl
-- A possibly tricky universes case (resulting universe cannot be decremented)
inductive UnivTest.{u,v} (α : Sort v): Sort (max u v 1) where
| mk1 : UnivTest α
| mk2 : (x : α) UnivTest α
| mk3 : (x : α) UnivTest α