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lean4/tests/elab_fail/448.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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namespace TryCatchWithAutolift
structure M (α : Type) where
σ : ExceptT String IO α
instance : Monad M where
pure x := { σ := pure x }
bind x f := { σ := do (f ( x.σ)).σ }
map f x := { σ := return f ( x.σ) }
instance : MonadLiftT IO M where
monadLift {α : Type} (act : IO α) : M α :=
{ σ := monadLift act }
instance : MonadFinally M where
tryFinally' := fun x h => M.mk do
tryFinally' x.σ fun e => (h e).σ
def t : M Unit := do
liftM $ IO.println "bad"
try do pure () -- Error
catch ex : IO.Error => do pure ()
finally do pure ()
instance : MonadExceptOf IO.Error M where
throw e := { σ := throwThe IO.Error e }
tryCatch x handle := { σ := tryCatchThe IO.Error x.σ fun e => handle e |>.σ }
def t2 : M Unit := do
liftM $ IO.println "bad"
try do pure ()
catch ex : IO.Error => do pure ()
finally do pure ()
end TryCatchWithAutolift