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lean4/tests/elab/ctorElim.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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inductive Vec (α : Type) : Nat Type where
| nil : Vec α 0
| cons {n} : α Vec α n Vec α (n + 1)
/--
info: @[reducible] protected def Vec.nil.elim.{u} : {α : Type} →
{motive : (a : Nat) → Vec α a → Sort u} → {a : Nat} → (t : Vec α a) → t.ctorIdx = 0 → motive 0 Vec.nil → motive a t
-/
#guard_msgs in
#print sig Vec.nil.elim
/--
info: @[reducible] protected def Vec.cons.elim.{u} : {α : Type} →
{motive : (a : Nat) → Vec α a → Sort u} →
{a : Nat} →
(t : Vec α a) →
t.ctorIdx = 1 → ({n : Nat} → (a : α) → (a_1 : Vec α n) → motive (n + 1) (Vec.cons a a_1)) → motive a t
-/
#guard_msgs in
#print sig Vec.cons.elim
structure JustOneConstructor where
(x : Nat)
(y : Bool)
/-- error: Unknown constant `JustOneConstructor.mk.elim` -/
#guard_msgs in #print sig JustOneConstructor.mk.elim
-- Test that the compiler compiles the ctorelim to straight line code
set_option trace.Compiler.saveBase true
/--
trace: [Compiler.saveBase] size: 0
def testDecl1 α motive a.1 t h nil : motive lcAny lcAny :=
return nil
-/
#guard_msgs in
def testDecl1 :=@Vec.nil.elim
/--
trace: [Compiler.saveBase] size: 3
def testDecl2 α motive a.1 t h cons : motive lcAny lcAny :=
cases t : motive lcAny lcAny
| Vec.cons n a.2 a.3 =>
let _x.4 := cons n a.2 a.3;
return _x.4
-/
#guard_msgs in
def testDecl2 := @Vec.cons.elim