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>
53 lines
1.2 KiB
Text
53 lines
1.2 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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---
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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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---
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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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---
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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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---
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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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---
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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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---
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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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---
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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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