Merge pull request #72822 from stephentyrone/a-a-ambiguity-breaker-part-ii

Further ambiguity breakers for UDC & SEDC

Author: meg-gupta

stdlib/public/core/Codable.swift

@@ -7128,3 +7128,29 @@ extension SingleValueEncodingContainer where Self: UnkeyedEncodingContainer {
     )
   }
 }
+
+// Default implementations for types with stricter availability than SVDC & UDC
+// We need these to break ambiguity when an encoding container conforms to both.
+extension SingleValueDecodingContainer where Self: UnkeyedDecodingContainer {
+  @available(SwiftStdlib 6.0, *)
+  public func decode(_ type: Int128.Type) throws -> Int128 {
+    throw DecodingError.typeMismatch(
+      Int128.self,
+      DecodingError.Context(
+        codingPath: codingPath,
+        debugDescription: "Decoder has not implemented support for Int128"
+      )
+    )
+  }
+  
+  @available(SwiftStdlib 6.0, *)
+  public func decode(_ type: UInt128.Type) throws -> UInt128 {
+    throw DecodingError.typeMismatch(
+      UInt128.self,
+      DecodingError.Context(
+        codingPath: codingPath,
+        debugDescription: "Decoder has not implemented support for UInt128"
+      )
+    )
+  }
+}

test/abi/macOS/arm64/stdlib.swift

@@ -268,6 +268,7 @@ Added: _$ss24UnkeyedEncodingContainerPsE6encodeyys6Int128VKF
 Added: _$ss28SingleValueDecodingContainerP6decodeys6Int128VAEmKFTj
 Added: _$ss28SingleValueDecodingContainerP6decodeys6Int128VAEmKFTq
 Added: _$ss28SingleValueDecodingContainerPsE6decodeys6Int128VAEmKF
+Added: _$ss28SingleValueDecodingContainerPss07UnkeyedcD0RzrlE6decodeys6Int128VAFmKF
 Added: _$ss28SingleValueEncodingContainerP6encodeyys6Int128VKFTj
 Added: _$ss28SingleValueEncodingContainerP6encodeyys6Int128VKFTq
 Added: _$ss28SingleValueEncodingContainerPsE6encodeyys6Int128VKF
@@ -406,6 +407,7 @@ Added: _$ss24UnkeyedEncodingContainerPsE6encodeyys7UInt128VKF
 Added: _$ss28SingleValueDecodingContainerP6decodeys7UInt128VAEmKFTj
 Added: _$ss28SingleValueDecodingContainerP6decodeys7UInt128VAEmKFTq
 Added: _$ss28SingleValueDecodingContainerPsE6decodeys7UInt128VAEmKF
+Added: _$ss28SingleValueDecodingContainerPss07UnkeyedcD0RzrlE6decodeys7UInt128VAFmKF
 Added: _$ss28SingleValueEncodingContainerP6encodeyys7UInt128VKFTj
 Added: _$ss28SingleValueEncodingContainerP6encodeyys7UInt128VKFTq
 Added: _$ss28SingleValueEncodingContainerPsE6encodeyys7UInt128VKF

test/abi/macOS/x86_64/stdlib.swift

@@ -268,6 +268,7 @@ Added: _$ss24UnkeyedEncodingContainerPsE6encodeyys6Int128VKF
 Added: _$ss28SingleValueDecodingContainerP6decodeys6Int128VAEmKFTj
 Added: _$ss28SingleValueDecodingContainerP6decodeys6Int128VAEmKFTq
 Added: _$ss28SingleValueDecodingContainerPsE6decodeys6Int128VAEmKF
+Added: _$ss28SingleValueDecodingContainerPss07UnkeyedcD0RzrlE6decodeys6Int128VAFmKF
 Added: _$ss28SingleValueEncodingContainerP6encodeyys6Int128VKFTj
 Added: _$ss28SingleValueEncodingContainerP6encodeyys6Int128VKFTq
 Added: _$ss28SingleValueEncodingContainerPsE6encodeyys6Int128VKF
@@ -406,6 +407,7 @@ Added: _$ss24UnkeyedEncodingContainerPsE6encodeyys7UInt128VKF
 Added: _$ss28SingleValueDecodingContainerP6decodeys7UInt128VAEmKFTj
 Added: _$ss28SingleValueDecodingContainerP6decodeys7UInt128VAEmKFTq
 Added: _$ss28SingleValueDecodingContainerPsE6decodeys7UInt128VAEmKF
+Added: _$ss28SingleValueDecodingContainerPss07UnkeyedcD0RzrlE6decodeys7UInt128VAFmKF
 Added: _$ss28SingleValueEncodingContainerP6encodeyys7UInt128VKFTj
 Added: _$ss28SingleValueEncodingContainerP6encodeyys7UInt128VKFTq
 Added: _$ss28SingleValueEncodingContainerPsE6encodeyys7UInt128VKF