lean4-htt/tests/lean/run/noncomputable_example.lean
Leonardo de Moura bf9f7560f7 feat(frontends/lean): (Type u) can't be a proposition
(Type u)  is the old (Type (u+1))
(PType u) is the old (Type u)
Type*     is the old (Type (_+1))
PType*    is the old Type*

The stdlib can be compiled, but we still have > 70 broken tests

See discussion at #1341
2017-01-30 11:54:00 -08:00

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open classical sum
universe variable u
noncomputable example (A : Type u) (h : (A → empty) → false) : A :=
match type_decidable A with
| (inl ha) := ha
| (inr hna) := false.rec _ (h hna)
end