lean2/tests/lean/unique_instances.lean

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import logic data.prod
open prod
set_option class.unique_instances true set_option pp.implicit true
theorem tst (A : Type) (H₁ : inhabited A) (H₂ : inhabited A) : inhabited (A × A) :=
_
set_option class.unique_instances false
theorem tst (A : Type) (H₁ : inhabited A) (H₂ : inhabited A) : inhabited (A × A) :=
_