17 lines
620 B
Text
17 lines
620 B
Text
def foo {m} [Monad m] [MonadExcept String m] [MonadState (Array Nat) m] : m Nat :=
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catch (do modify $ λ a : Array Nat, a.set 0 33,
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throw "error")
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(λ _, do 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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#exit
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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 `HasRepr (id (Except String Nat))` because `id` is not transparent.
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#eval run ex₁ (mkArray 10 1000)
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#eval run ex₂ (mkArray 10 1000)
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