23 lines
281 B
Text
23 lines
281 B
Text
new_frontend
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namespace Foo
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structure A :=
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(x : Nat)
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def A.doubleX (a : A) :=
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2 * a.x
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structure B extends A :=
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(y : Nat)
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def f (b : B) : Nat :=
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b.x + b.doubleX
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theorem ex1 : { x := 10, y := 0 : B }.doubleX = 20 :=
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rfl
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theorem ex2 : f { x := 10, y := 0 } = 30 :=
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rfl
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end Foo
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