lean4-htt/tests/lean/magical.lean
Leonardo de Moura 7920db9521 feat: check for invalid projections during elaboration
It produces a better error message than the one produced by the
kernel.
2022-02-25 07:43:37 -08:00

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def witness : Nat := (⟨1, Nat.le_refl _⟩ : ∃ x, x ≥ 1).1