Merge pull request #18761 from nkcsgexi/diagnose-gs

swift-api-digester: diagnose generic signature change for any declarations.

Author: nkcsgexi

include/swift/IDE/DigesterEnums.def

@@ -62,6 +62,7 @@ NODE_ANNOTATION(OwnershipChange)
 NODE_ANNOTATION(ChangeObjC)
 NODE_ANNOTATION(ChangeFixedLayout)
 NODE_ANNOTATION(ChangeFrozen)
+NODE_ANNOTATION(ChangeGenericSignature)
 NODE_ANNOTATION(RawTypeLeft)
 NODE_ANNOTATION(RawTypeRight)
 

test/api-digester/Inputs/cake1.swift

@@ -36,3 +36,11 @@ public struct C6 {}
 
 @_frozen
 public enum IceKind {}
+
+public protocol P1 {}
+
+public protocol P2 {}
+
+public extension P1 where Self: P2 {
+  func P1Constraint() {}
+}

test/api-digester/Inputs/cake2.swift

@@ -35,4 +35,12 @@ public class C5 {}
 @_fixed_layout
 public struct C6 {}
 
-public enum IceKind {}
+public enum IceKind {}
+
+public protocol P1 {}
+
+public protocol P2 {}
+
+public extension P1 {
+  func P1Constraint() {}
+}

test/api-digester/Outputs/Cake-abi.txt

@@ -1,4 +1,7 @@
 
+/* Generic Signature Changes */
+cake1: Func P1.P1Constraint() has generic signature change from <τ_0_0 where τ_0_0 : P1, τ_0_0 : P2> to <τ_0_0 where τ_0_0 : P1>
+
 /* RawRepresentable Changes */
 
 /* Removed Decls */

test/api-digester/Outputs/Cake.txt

@@ -1,4 +1,7 @@
 
+/* Generic Signature Changes */
+cake1: Func P1.P1Constraint() has generic signature change from <Self where Self : P1, Self : P2> to <Self where Self : P1>
+
 /* RawRepresentable Changes */
 
 /* Removed Decls */

test/api-digester/Outputs/apinotes-diags-3-4.txt

@@ -1,4 +1,6 @@
 
+/* Generic Signature Changes */
+
 /* RawRepresentable Changes */
 APINotesTest(APINotesTest.h): TypeAlias AnimalAttributeName(NSString) is now String representable
 

test/api-digester/Outputs/apinotes-diags.txt

@@ -1,4 +1,8 @@
 
+/* Generic Signature Changes */
+APINotesTest(APINotesTest.h): Func SwiftTypeWithMethodLeft.minusPrint() has generic signature change from <Self where Self : SwiftTypeWithMethodLeft> to <Self where Self : SwiftTypeWithMethodRight>
+APINotesTest(APINotesTest.h): Func SwiftTypeWithMethodLeft.plusPrint() has generic signature change from <Self where Self : SwiftTypeWithMethodLeft> to <Self where Self : SwiftTypeWithMethodRight>
+
 /* RawRepresentable Changes */
 APINotesTest(APINotesTest.h): TypeAlias CatAttributeName(NSString) is now String representable