675d2d5a11
This PR changes the rule for which projections become instances. Before, all parents along with all indirect ancestors that were represented as subobject fields would have their projections become instances. Now only projections for direct parents become instances. Features: - Only parents that are not ancestors of other parents get instances. This allows "discretionary" indirect parents to be inserted for the purpose of computing strict resolution orders when `structure.strictResolutionOrder` is enabled, without having an impact on typeclass synthesis. - Non-subobject projections are now theorems if the parent is a proposition. These are also no longer `@[reducible]`. Closes #2905
57 lines
1.1 KiB
Text
57 lines
1.1 KiB
Text
--
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structure A (α : Type) where
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(x : α)
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structure B (α : Type) where
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(x : α)
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structure S : Nat where -- error expected Type
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(x : Nat)
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structure S extends Nat → Nat where -- error expected structure
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(x : Nat)
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set_option structureDiamondWarning true in
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structure S' extends A Nat, B Nat where -- error field `x` already declared
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(x : Nat)
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structure SDup extends A Nat, A Nat where -- duplicate parent structure 'A'
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structure S extends A Nat, B Bool where -- error field `x` from `B` has already been declared
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(x : Nat)
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structure S1 where
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(_x : Nat)
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structure S2 where
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(x _y : Nat)
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structure S where
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(x : Nat)
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(x : Nat) -- error
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structure S extends A Nat where
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(x : Nat) -- error
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structure S' extends A Nat where
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(x := true) -- error type mismatch
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structure S extends A Nat where
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(x : Bool := true) -- error omit type
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structure S'' where
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(x : Nat := true) -- error type mismatch
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private structure S where
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private mk :: (x : Nat)
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private structure S where
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protected mk :: (x : Nat)
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private structure S where
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protected (x : Nat)
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private structure S where
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mk2 :: (x : Nat)
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#check S
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#check S.mk2
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