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