7ed716f904
This PR improves the error messages produced by invalid projections and field notation. It also adds a hint to the "function expected" error message noting the argument to which the term is being applied, which can be helpful for debugging spurious "function expected" messages actually caused by syntax errors. --------- Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
59 lines
1.6 KiB
Text
59 lines
1.6 KiB
Text
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set_option linter.unusedVariables false
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def Nat.bar (x : String) (x : Nat) (y : Nat) := x
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/--
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error: Invalid field notation: `Nat.bar` has a parameter with expected type
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Nat
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but it cannot be used
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Note: The parameter `x` of `Nat.bar` cannot be referred to by name because that function has a preceding parameter of the same name
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Hint: Consider rewriting this application without field notation (e.g., `C.f x` instead of `x.f`) or changing the parameter names of `Nat.bar` to avoid this conflict
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-/
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#guard_msgs in
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#check Nat.zero.bar
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structure F where
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f : Bool → Nat → Nat
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def Nat.foo : F := { f := fun _ _ => 0 }
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section
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local instance : CoeFun F (fun _ => Bool → Nat → Nat) where
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coe x := fun (a : Bool) (b : Nat) => x.f a b
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/--
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error: Invalid field notation: `Nat.foo` has a parameter with expected type
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Nat
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but it cannot be used
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Note: Field notation cannot refer to parameter `b` of `Nat.foo` by name because that constant was coerced to a function
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Hint: Consider rewriting this application without field notation (e.g., `C.f x` instead of `x.f`)
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-/
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#guard_msgs in #check Nat.zero.foo
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/-- info: (fun a b => Nat.foo.f a b) true Nat.zero : Nat -/
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#guard_msgs in #check Nat.zero.foo true
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end
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section
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local instance : CoeFun F (fun _ => Bool → Nat → Nat) where
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coe x := fun _ _ => 0
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/--
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error: Invalid field notation: `Nat.foo` has a parameter with expected type
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Nat
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but it cannot be used
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Hint: Consider rewriting this application without field notation (e.g., `C.f x` instead of `x.f`)
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-/
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#guard_msgs in #check Nat.zero.foo
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/-- info: (fun x x => 0) true Nat.zero : Nat -/
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#guard_msgs in #check Nat.zero.foo true
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end
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