ab606ba754
This PR provides an additional hint when the type of an autobound implicit is required to have function type or equality type — this fails, and the existing error message does not address the fact that the source of the error is an unknown identifier that was automatically bound. ## Example ``` import Lean example : MetaM String := pure "" ``` Current error message: ``` Function expected at MetaM but this term has type ?m Note: Expected a function because this term is being applied to the argument String ``` Additional error message provided by this PR: ``` Hint: The identifier `MetaM` is unknown, and Lean's `autoImplicit` option causes an unknown identifier to be treated as an implicitly bound variable with an unknown type. However, the unknown type cannot be a function, and a function is what Lean expects here. This is often the result of a typo or a missing `import` or `open` statement. ```
19 lines
739 B
Text
19 lines
739 B
Text
import Lean
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example : Option String := sorry
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example : Maybe String := sorry
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example : Result String Nat := sorry
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example : Nonsense String Nat := sorry
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example : MetaM String := sorry
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set_option relaxedAutoImplicit false in
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example : MetaM String := sorry
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set_option relaxedAutoImplicit false in
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example : Nonsense String := sorry
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example (h₁ : α = β) (as : List α) (P : List β → Type) : P (h₁ ▸ as) := sorry
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example {α β h} (h₁ : α = β) (as : List α) (P : List β → Type) : P (h ▸ as) := sorry
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example (h₁ : α = β) (as : List α) (P : List β → Type) : P (h ▸ as) := sorry
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set_option relaxedAutoImplicit false in
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example (h₁ : α = β) (as : List α) (P : List β → Type) : P (hi ▸ as) := sorry
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