lean4-htt/tests/elab/repr_issue.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 foo {m} [Monad m] [MonadExcept String m] [MonadState (Array Nat) m] : m Nat :=
tryCatch
(do modify $ fun (a : Array Nat) => a.set! 0 33;
throw "error")
(fun _ => do let a ← get; pure $ a[0]!)
def ex₁ : StateT (Array Nat) (ExceptT String Id) Nat :=
foo
def ex₂ : ExceptT String (StateT (Array Nat) Id) Nat :=
foo
-- The following examples were producing an element of Type `id (Except String Nat)`.
-- Type class resolution was failing to produce an instance for `Repr (id (Except String Nat))` because `id` is not transparent.
#eval ex₁.run' (Array.replicate 10 1000) |>.run
#eval ex₂.run' (Array.replicate 10 1000) |>.run