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lean4/tests/elab/eqnsReducible.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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import Lean.Elab.Command
variable (P : Bool Prop)
variable (o : Option Nat)
/-!
This test checks that `simp [foo]` where `foo` is `reducible` uses the unfolding machinery,
not the equations machinery.
-/
@[reducible] def red : Option α Bool
| .some _ => true
| .none => false
-- check that simp rewrites even without constants
/--
error: Failed: `fail` tactic was invoked
P : Bool → Prop
o : Option Nat
⊢ P
(match o with
| some val => true
| none => false)
-/
#guard_msgs in
theorem ex1 : P (red o) := by simp [red]; fail
-- check that the equational theorems have not been generated
/-- info: false -/
#guard_msgs in
run_meta Lean.logInfo m!"{← Lean.hasConst `red.eq_1}"
-- Again, the same for the `simp` attribute
attribute [simp] red
/-- info: false -/
#guard_msgs in
run_meta Lean.logInfo m!"{← Lean.hasConst `red.eq_1}"
/--
error: Failed: `fail` tactic was invoked
P : Bool → Prop
o : Option Nat
⊢ P
(match o with
| some val => true
| none => false)
-/
#guard_msgs in
theorem ex1' : P (red o) := by simp; fail
-- For comparison, the behavior for a semi-reducible function
def semired : Option α Bool
| .some _ => true
| .none => false
-- At least for now, non-recursive functions are also unfolded by simp (as per
-- `SimpTheorems.unfoldEvenWithEqns`), in addition to applying their rewrite rules:
/--
error: Failed: `fail` tactic was invoked
P : Bool → Prop
o : Option Nat
⊢ P
(match o with
| some val => true
| none => false)
-/
#guard_msgs in
theorem ex2 : P (semired o) := by simp [semired]; fail
-- check that the equational theorems have been generated
/-- info: true -/
#guard_msgs in
run_meta Lean.logInfo m!"{← Lean.hasConst (skipRealize := false) `semired.eq_1}"
def semired2 : Option α Bool
| .some _ => true
| .none => false
attribute [simp] semired2
/-- info: true -/
#guard_msgs in
run_meta Lean.logInfo m!"{← Lean.hasConst `semired2.eq_1}"
/--
error: Failed: `fail` tactic was invoked
P : Bool → Prop
o : Option Nat
⊢ P
(match o with
| some val => true
| none => false)
-/
#guard_msgs in
theorem ex2' : P (semired2 o) := by simp; fail