53 lines
993 B
Text
53 lines
993 B
Text
new_frontend
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structure A0.{u} (α : Type u) :=
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(x : α)
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structure A.{u} (α : Type u) extends A0 α :=
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(y : α)
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structure B.{u} (α : Type u) :=
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(z : α)
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variable (β : Type _)
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variable (β' : Type _)
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universe u
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structure C.{v} (α : Type _) (δ : Type u) (η : Type v) extends A β, B α :=
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mk2 :: (w : Nat := 10)
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#check C
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#check @C
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#check @C.mk2
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#check { x := 10, y := 20, z := 30, w := 40 : C Nat Nat Nat Nat }
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#check C.recOn
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#check C.w
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#check fun (c : C Nat Nat Nat Nat) => c.x
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def f0 (c : C Nat Nat Nat Nat) : A Nat :=
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c.toA
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def f1 (c : C Nat Nat Nat Nat) :=
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c.x + c.w
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class Tst (α : Type u) extends HasMul α :=
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(comm : ∀ (a b : α), a * b = b * a)
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#check @Tst.comm
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#check @Tst.toHasMul
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def foo {α} [Tst α] (a b : α) :=
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a * b
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#check { x := 10, y := 20, z := 30 : C Nat Nat Nat Nat }
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class Foo (α : Type u) extends HasAdd α :=
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(x : α)
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class Boo (α : Type u) extends Foo α :=
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(y : α := x + x)
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#check @Boo.y._default
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#check { add := Nat.add, x := 10 : Boo Nat}
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