15 lines
339 B
Text
15 lines
339 B
Text
definition f1 (A : Type*) (a : A) :=
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have has_add A, from has_add.mk (λ (a b : A), a),
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a + a
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definition f2 (A : Type*) (a : A) : has_add A → A :=
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λ s, a + a
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definition f3 (A : Type*) (a : A) :=
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λ s : has_add A, a + a
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definition f4 (A : Type*) [has_add A] (a : A) :=
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a + a
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definition g (A : Type*) (s : has_add A) (a : A) :=
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a + a
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