lean4-htt/tests/elab/8721.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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import Std.Data.ExtTreeMap
/-!
# Test for extensional tree maps (#8721)
-/
open Std
/-!
The `ForIn` instance elaborates correctly for lawful monads.
Note: We require the `Monad` instance to be synthesized for the `ForIn` instance to make sure that
`LawfulMonad` is available. `forIn` still provides another monad instance which we ignore. This
results in one redundant instance synthesis (which should be cached though).
-/
def test (x : ExtTreeMap Nat Nat) : StateM Nat Nat := do
let mut acc := 0
for val in x do
acc := acc + val.1
modify fun a => a + val.2
return acc
/--
info: (11, 5)
-/
#guard_msgs in
#eval (test {⟨4, 3⟩, ⟨7, 2⟩}).run 0