27 lines
1.1 KiB
Text
27 lines
1.1 KiB
Text
/-
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This is an annoyingly unhelpful error message that I see frequently.
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It reports the prefix of the field notation, but not the field that we are trying to access.
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An exact line number would help, but even so it would be great to report the field as well.
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[Leo]: the bad line number is due to the transition from Lean3 to Lean4.
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The new frontend reports the exact position. It still fails to elaborate since
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the types of `f`, `g` and `h` are unknown, and there is no `Foo.f6`.
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I decided to no report the field, users have all information they neeed when the correct position is reported.
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-/
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structure Foo := (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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#check (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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/home/dselsam/omega/lean4/tests/elabissues/invalid_field_notation_error.lean:8:0: error: invalid field notation, type is not of the form (C ...) where C is a constant
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-/
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