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
29 lines
1.2 KiB
Text
29 lines
1.2 KiB
Text
struct1.lean:9:14-9:17: error: invalid structure type, expecting 'Type _' or 'Prop'
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struct1.lean:12:20-12:29: error: expected structure
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struct1.lean:15:28-15:33: warning: field 'x' from 'B' has already been declared
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struct1.lean:16:1-16:2: error: field 'x' has been declared in parent structure
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struct1.lean:17:30-17:35: warning: duplicate parent structure 'A', skipping
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struct1.lean:19:27-19:33: error: parent field type mismatch, field 'x' from parent 'B' has type
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Bool : Type
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but is expected to have type
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Nat : Type
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struct1.lean:30:1-30:2: error: field 'x' has already been declared
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struct1.lean:33:1-33:2: error: field 'x' has been declared in parent structure
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struct1.lean:36:6-36:10: error: type mismatch
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true
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has type
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Bool : Type
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but is expected to have type
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Nat : Type
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struct1.lean:39:5-39:9: error: omit field 'x' type to set default value
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struct1.lean:42:12-42:16: error: type mismatch
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true
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has type
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Bool : Type
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but is expected to have type
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Nat : Type
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struct1.lean:45:0-45:13: error: invalid 'private' constructor in a 'private' structure
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struct1.lean:48:0-48:15: error: invalid 'protected' constructor in a 'private' structure
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struct1.lean:51:0-51:19: error: invalid 'protected' field in a 'private' structure
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S : Type
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S.mk2 (x : Nat) : S
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