lean4-htt/tests/elab/6999.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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/-!
# List index validity proofs synthesized by unification
https://github.com/leanprover/lean4/issues/6999
The tactic `get_elem_tactic` should not fail if invoked in a situation in which the necessary proof
of index validity has already been filled in during unification.
-/
set_option linter.unusedVariables false
axiom A : Type
axiom B : A → Type
axiom as : List A
axiom fn : (l : Nat) → (_ : l < as.length) → Option (B as[l])
#guard_msgs in
example {l : Nat} {llen : l < as.length} {b : B as[l]}
(b_mem : b ∈ fn l llen) : True := trivial