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[Merged by Bors] - fix(slim_check): do not crash when binders contain a function type #11231

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[Merged by Bors] - fix(slim_check): do not crash when binders contain a function type #11231

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a4b3b00
fix(slim_check): do not crash when binders contain a function type
eric-wieser Mar 7, 2024
0c47666
fix recursion
eric-wieser Mar 7, 2024
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4 changes: 2 additions & 2 deletions Mathlib/Testing/SlimCheck/Testable.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -509,8 +509,8 @@ open Lean
quantifiers and add `NamedBinder` annotations next to them. -/
partial def addDecorations (e : Expr) : MetaM Expr :=
Meta.transform e fun expr => do
if not (← Meta.inferType e).isProp then
return .continue
if not (← Meta.inferType expr).isProp then
return .done expr
Comment on lines +512 to +513
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I find the meaning clearer this way (although I know you weren't the one introducing this spelling).

Suggested change
if not (← Meta.inferType expr).isProp then
return .done expr
unless (← Meta.inferType expr).isProp
return .done expr

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Does unless support else? I think in an else/if chain, using unless makes things a little weirder to read.

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I don't think it does, but I claim that's a feature. The unless clause indicates a condition on which you want to immediately abort, which is not what an else/if chain indicates.

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I'm going to use "this if isn't really part of this patch" to avoid having to do anything in this CL. If you feel strongly that unless is underused, perhaps open a follow-up with 10 or so replacements across mathlib and see what people think.

bors merge

else if let Expr.forallE name type body data := expr then
let newType ← addDecorations type
let newBody ← Meta.withLocalDecl name data type fun fvar => do
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15 changes: 15 additions & 0 deletions test/slim_check.lean
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Expand Up @@ -413,6 +413,21 @@ issue: ⋯ does not hold
exact test_sorry
trivial

open scoped BigOperators in
example (n : ℕ) : true := by
have : ∑ f : Unit → Fin (n + 1), f () = 0 := by
success_if_fail_with_msg "
===================
Found problems!
n := 1
issue: 1 = 0 does not hold
(0 shrinks)
-------------------
"
slim_check (config := { randomSeed := some 257 })
exact test_sorry
trivial

-- https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/slim_check.20question/near/412709012
open scoped BigOperators in
/--
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