833434cd56
This PR adds a warning when using `cbv` or `decide_cbv` in tactic mode, matching the existing warning in conv mode (`src/Lean/Elab/Tactic/Conv/Cbv.lean`). The warning informs users that these tactics are experimental and still under development. It can be disabled with `set_option cbv.warning false`. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
24 lines
710 B
Text
24 lines
710 B
Text
set_option cbv.warning false
|
|
|
|
-- Success: proposition reduces to `Bool.true`
|
|
example : 1 + 1 = 2 := by decide_cbv
|
|
|
|
example : 1 ∈ [1, 2, 3] := by decide_cbv
|
|
|
|
/-- error: `decide_cbv` failed: the proposition evaluates to `false` -/
|
|
#guard_msgs (error) in
|
|
example : 1 + 1 = 3 := by decide_cbv
|
|
|
|
opaque myOpaqueBool : Bool
|
|
|
|
/--
|
|
error: `decide_cbv` failed: could not reduce the expression to a boolean value; got stuck at: ⏎
|
|
Decidable.rec (fun h => false) (fun h => true)
|
|
(match myOpaqueBool, true with
|
|
| false, false => isTrue ⋯
|
|
| false, true => isFalse ⋯
|
|
| true, false => isFalse ⋯
|
|
| true, true => isTrue ⋯)
|
|
-/
|
|
#guard_msgs (error) in
|
|
example : myOpaqueBool = true := by decide_cbv
|