22 lines
558 B
Text
22 lines
558 B
Text
/-
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This is an annoyingly unhelpful error message that I see all the time.
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An exact line number would help a lot, but even so it would be great
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to replace the `⟨...⟩` with the actual term in question.
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-/
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structure Foo := (n : Nat)
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def Foo.sum (xs : List Foo) : Foo :=
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xs.foldl (λ s x => ⟨s.n + x.n⟩) ⟨0⟩
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#check
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let x1 := ⟨1⟩;
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let x2 := ⟨2⟩;
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let x3 := ⟨3⟩;
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let x4 := ⟨4⟩;
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let x5 := ⟨5⟩;
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let x6 := ⟨6⟩;
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Foo.sum [x1, x2, x3, x5, x6]
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/-
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error: invalid constructor ⟨...⟩, expected type is not an inductive type
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?m_1
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-/
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