dd28f00588
This PR gives suggestions based on the currently-available constants when projecting from an unknown type. ## Example: single suggestion in namespace This was the originally motivating example, as the string refactor led to a number of anonymous-lambda-expressions with `Char` functions that were no longer recognized as such. ```lean4 example := (·.isWhitespace) ``` Before: ``` Invalid field notation: Type of x✝ is not known; cannot resolve field `isWhitespace` ``` The message is unchanged, but this PR adds a hint: ``` Hint: Consider replacing the field projection `.isWhitespace` with a call to the function `Char.isWhitespace`. ``` ## Example: single suggestion in namespace ```lean4 example := fun n => n.succ ``` Before: ``` Invalid field notation: Type of n is not known; cannot resolve field `succ` ``` The message is unchanged, but this PR adds a hint: ``` Hint: Consider replacing the field projection with a call to one of the following: • `Fin.succ` • `Nat.succ` • `Std.PRange.succ` ```
94 lines
2.4 KiB
Text
94 lines
2.4 KiB
Text
structure Foo where (n : Nat)
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def Foo.f1 (f : Foo) : Nat := f.n
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def Foo.f2 (f : Foo) : Nat := f.n
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def Foo.f3 (f : Foo) : Nat := f.n
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def Foo.f4 (f : Foo) : Nat := f.n
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def Foo.f5 (f : Foo) : Nat := f.n
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/--
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error: Invalid field notation: Type of
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f
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is not known; cannot resolve field `n`
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Hint: Consider replacing the field projection with a call to one of the following:
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• `BitVec.DivModArgs.n`
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• `Foo.n`
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---
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error: Invalid field notation: Type of
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g
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is not known; cannot resolve field `n`
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Hint: Consider replacing the field projection with a call to one of the following:
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• `BitVec.DivModArgs.n`
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• `Foo.n`
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---
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error: Invalid field notation: Type of
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f
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is not known; cannot resolve field `f1`
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Hint: Consider replacing the field projection `.f1` with a call to the function `Foo.f1`.
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---
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error: Invalid field notation: Type of
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g
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is not known; cannot resolve field `f2`
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Hint: Consider replacing the field projection `.f2` with a call to the function `Foo.f2`.
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---
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error: Invalid field notation: Type of
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h
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is not known; cannot resolve field `f3`
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Hint: Consider replacing the field projection `.f3` with a call to the function `Foo.f3`.
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---
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error: Invalid field notation: Type of
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f
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is not known; cannot resolve field `f4`
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Hint: Consider replacing the field projection `.f4` with a call to the function `Foo.f4`.
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---
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error: Invalid field notation: Type of
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g
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is not known; cannot resolve field `f5`
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Hint: Consider replacing the field projection `.f5` with a call to the function `Foo.f5`.
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---
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error: Invalid field notation: Type of
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h
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is not known; cannot resolve field `f6`
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-/
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#guard_msgs in
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example := (λ f g h =>
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let x : Foo := ⟨f.n + 1⟩;
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let y : Foo := ⟨g.n + 1⟩;
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(λ f g h => f.f1 + g.f2 + h.f3 + f.f4 + g.f5 + h.f6) f g h)
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/--
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error: Invalid field notation: Type of
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id x
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is not known; cannot resolve field `foo`
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-/
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#guard_msgs in
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example := fun x => (id x).foo
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/--
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error: Invalid field notation: Type of
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x✝
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is not known; cannot resolve field `isWhitespace`
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Hint: Consider replacing the field projection `.isWhitespace` with a call to the function `Char.isWhitespace`.
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-/
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#guard_msgs in
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example := (·.isWhitespace)
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/--
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error: Invalid field notation: Type of
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x
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is not known; cannot resolve field `succ`
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Hint: Consider replacing the field projection with a call to one of the following:
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• `Fin.succ`
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• `Nat.succ`
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• `Std.PRange.succ`
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-/
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#guard_msgs in
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example := fun x => x.succ
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