lean4-htt/tests/elab/4920.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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def Vect (n: Nat) (A: Type u) := {l: List A // l.length = n}
def Vect.cons (a: A) (v: Vect n A): Vect (n + 1) A :=
⟨a::v.val, by simp [v.property]⟩
instance: GetElem (Vect n A) Nat A (λ _ i => i < n) where
getElem vec i _ := match vec with | ⟨l, _⟩ => l[i]
set_option pp.mvars false
/--
error: Type mismatch
xm[i]
has type
Vect m A
but is expected to have type
A
---
error: Type mismatch: After simplification, term
ih
has type
i < as.length
of sort `Prop` but is expected to have type
?_
of sort `Type _`
---
error: failed to prove index is valid, possible solutions:
- Use `have`-expressions to prove the index is valid
- Use `a[i]!` notation instead, runtime check is performed, and 'Panic' error message is produced if index is not valid
- Use `a[i]?` notation instead, result is an `Option` type
- Use `a[i]'h` notation instead, where `h` is a proof that index is valid
A : Type _
m i j : Nat
as : List A
xm : List (Vect m A)
h0 : xm.length = as.length
ih : i < (List.zipWith cons as xm).length
jh : j < m
⊢ ?_ sorry j
-/
#guard_msgs in
theorem Vect.aux
{as: List A} {xm: List (Vect m A)}
(h0: xm.length = as.length)
(ih: i < (List.zipWith cons as xm).length)
(jh: j < m)
: ((List.zipWith cons as xm)[i])[j + 1] =
xm[i]'(by simpa[h0] using ih)[j] := by
-- Correct syntax requires an extra pair of parentheses:
-- (xm[i]'(by simpa[h0] using ih))[j]
-- but `lean` should not crash.
sorry