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lean4/tests/elab/11773.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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Lean4

/-! This is a regression test for an issue with the implemented_by of Array.foldlM -/
/--
error: Tactic `native_decide` evaluated that the proposition
foldl (fun x1 x2 => x1 + x2) 0 #[1, 2, 3] 0 5 = 0
is false
-/
#guard_msgs in
theorem Array.foldl_broken : False := by
let x := #[1,2,3].foldl (. + .) 0 (stop := 5)
have : x = 6 := by rfl
have : x = 0 := by native_decide
contradiction
example : #[1,2,3].foldl (. + .) 0 (stop := 5) = 6 := by native_decide
/--
error: Tactic `native_decide` evaluated that the proposition
foldl (fun x1 x2 => x1 + x2) 0 { data := #[1, 2, 3] } 0 5 = 0
is false
-/
#guard_msgs in
theorem ByteArray.foldl_broken : False := by
let x := (ByteArray.mk #[1,2,3]).foldl (. + .) 0 (stop := 5)
have : x = 6 := by rfl
have : x = 0 := by native_decide
grind
example : (ByteArray.mk #[1,2,3]).foldl (. + .) 0 (stop := 5) = 6 := by native_decide