Accessor MutableCollection.subscript(_:).Get() has generic signature change from <Self where Self : Swift.MutableCollection> to <Self where Self : Swift.MutableCollection, Self.SubSequence == Swift.Slice<Self>>
Accessor MutableCollection.subscript(_:).Set() has generic signature change from <Self where Self : Swift.MutableCollection> to <Self where Self : Swift.MutableCollection, Self.SubSequence == Swift.Slice<Self>>
Protocol CodingKey has added inherited protocol Sendable
Protocol CodingKey has generic signature change from <Self : Swift.CustomDebugStringConvertible, Self : Swift.CustomStringConvertible> to <Self : Swift.CustomDebugStringConvertible, Self : Swift.CustomStringConvertible, Self : Swift.Sendable>
Protocol Error has added inherited protocol Sendable
Protocol Error has generic signature change from to <Self : Swift.Sendable>
Subscript MutableCollection.subscript(_:) has generic signature change from <Self where Self : Swift.MutableCollection> to <Self where Self : Swift.MutableCollection, Self.SubSequence == Swift.Slice<Self>>

// Not actually a source break; the typechecker will find these operations on
// FixedWidthInteger instead.
Func SignedInteger.&+(_:_:) has been removed
Func SignedInteger.&-(_:_:) has been removed

// The GenericSignatureBuilder would produce redundant same-type requirements in the minimized signature; these are now gone.

Protocol Collection has generic signature change from <Self : Swift.Sequence, Self.Element == Self.SubSequence.Element, Self.Index : Swift.Comparable, Self.Index == Self.Indices.Element, Self.Indices : Swift.Collection, Self.Indices == Self.Indices.SubSequence, Self.SubSequence : Swift.Collection, Self.SubSequence == Self.SubSequence.SubSequence, Self.Indices.Element == Self.Indices.Index, Self.Indices.Index == Self.SubSequence.Index, Self.SubSequence.Index == Self.Indices.Indices.Element, Self.Indices.Indices.Element == Self.Indices.Indices.Index, Self.Indices.Indices.Index == Self.SubSequence.Indices.Element, Self.SubSequence.Indices.Element == Self.SubSequence.Indices.Index, Self.SubSequence.Indices.Index == Self.SubSequence.Indices.Indices.Element, Self.SubSequence.Indices.Indices.Element == Self.SubSequence.Indices.Indices.Index> to <Self : Swift.Sequence, Self.Element == Self.SubSequence.Element, Self.Index : Swift.Comparable, Self.Index == Self.Indices.Element, Self.Indices : Swift.Collection, Self.Indices == Self.Indices.SubSequence, Self.SubSequence : Swift.Collection, Self.SubSequence == Self.SubSequence.SubSequence, Self.Indices.Element == Self.Indices.Index, Self.Indices.Index == Self.SubSequence.Index>

Protocol StringProtocol has generic signature change from <Self : Swift.BidirectionalCollection, Self : Swift.Comparable, Self : Swift.ExpressibleByStringInterpolation, Self : Swift.Hashable, Self : Swift.LosslessStringConvertible, Self : Swift.TextOutputStream, Self : Swift.TextOutputStreamable, Self.Element == Swift.Character, Self.Index == Swift.String.Index, Self.StringInterpolation == Swift.DefaultStringInterpolation, Self.SubSequence : Swift.StringProtocol, Self.UTF16View : Swift.BidirectionalCollection, Self.UTF8View : Swift.Collection, Self.UnicodeScalarView : Swift.BidirectionalCollection, Self.UTF16View.Element == Swift.UInt16, Self.UTF16View.Index == Swift.String.Index, Self.UTF8View.Element == Swift.UInt8, Self.UTF8View.Index == Swift.String.Index, Self.UnicodeScalarView.Element == Swift.Unicode.Scalar, Self.UnicodeScalarView.Index == Swift.String.Index, Self.SubSequence.UTF16View.Index == Swift.String.Index, Self.SubSequence.UTF8View.Index == Swift.String.Index, Self.SubSequence.UnicodeScalarView.Index == Swift.String.Index> to <Self : Swift.BidirectionalCollection, Self : Swift.Comparable, Self : Swift.ExpressibleByStringInterpolation, Self : Swift.Hashable, Self : Swift.LosslessStringConvertible, Self : Swift.TextOutputStream, Self : Swift.TextOutputStreamable, Self.Element == Swift.Character, Self.Index == Swift.String.Index, Self.StringInterpolation == Swift.DefaultStringInterpolation, Self.SubSequence : Swift.StringProtocol, Self.UTF16View : Swift.BidirectionalCollection, Self.UTF8View : Swift.Collection, Self.UnicodeScalarView : Swift.BidirectionalCollection, Self.UTF16View.Element == Swift.UInt16, Self.UTF16View.Index == Swift.String.Index, Self.UTF8View.Element == Swift.UInt8, Self.UTF8View.Index == Swift.String.Index, Self.UnicodeScalarView.Element == Swift.Unicode.Scalar, Self.UnicodeScalarView.Index == Swift.String.Index>

// The RequirementMachine does not preserve sugared types in requirements. Not actually a source break.
Func Substring.UnicodeScalarView.replaceSubrange(_:with:) has generic signature change from <C where C : Swift.Collection, C.Element == Swift.Substring.UnicodeScalarView.Element> to <C where C : Swift.Collection, C.Element == Swift.Unicode.Scalar>
Func Substring.replaceSubrange(_:with:) has generic signature change from <C where C : Swift.Collection, C.Element == Swift.Substring.Iterator.Element> to <C where C : Swift.Collection, C.Element == Swift.Character>
Func Unicode.ASCII.Parser.parseScalar(from:) has generic signature change from <I where I : Swift.IteratorProtocol, I.Element == Swift.Unicode.ASCII.Parser.Encoding.CodeUnit> to <I where I : Swift.IteratorProtocol, I.Element == Swift.UInt8>
Func Unicode.UTF16.decode(_:) has generic signature change from <I where I : Swift.IteratorProtocol, I.Element == Swift.Unicode.UTF16.CodeUnit> to <I where I : Swift.IteratorProtocol, I.Element == Swift.UInt16>
Func Unicode.UTF32.Parser.parseScalar(from:) has generic signature change from <I where I : Swift.IteratorProtocol, I.Element == Swift.Unicode.UTF32.Parser.Encoding.CodeUnit> to <I where I : Swift.IteratorProtocol, I.Element == Swift.UInt32>
Func Unicode.UTF32.decode(_:) has generic signature change from <I where I : Swift.IteratorProtocol, I.Element == Swift.Unicode.UTF32.CodeUnit> to <I where I : Swift.IteratorProtocol, I.Element == Swift.UInt32>
Func Unicode.UTF8.decode(_:) has generic signature change from <I where I : Swift.IteratorProtocol, I.Element == Swift.Unicode.UTF8.CodeUnit> to <I where I : Swift.IteratorProtocol, I.Element == Swift.UInt8>
Constructor Mirror.init(_:children:displayStyle:ancestorRepresentation:) has generic signature change from <Subject, C where C : Swift.Collection, C.Element == Swift.Mirror.Child> to <Subject, C where C : Swift.Collection, C.Element == (label: Swift.String?, value: Any)>

// Generalizations due to typed throws.
Func AnyBidirectionalCollection.map(_:) has generic signature change from <Element, T> to <Element, T, E where E : Swift.Error>
Func AnyBidirectionalCollection.map(_:) is now without @rethrows
Func AnyCollection.map(_:) has generic signature change from <Element, T> to <Element, T, E where E : Swift.Error>
Func AnyCollection.map(_:) is now without @rethrows
Func AnyRandomAccessCollection.map(_:) has generic signature change from <Element, T> to <Element, T, E where E : Swift.Error>
Func AnyRandomAccessCollection.map(_:) is now without @rethrows
Func AnySequence.map(_:) has generic signature change from <Element, T> to <Element, T, E where E : Swift.Error>
Func AnySequence.map(_:) is now without @rethrows
Func Collection.map(_:) has generic signature change from <Self, T where Self : Swift.Collection> to <Self, T, E where Self : Swift.Collection, E : Swift.Error>
Func Collection.map(_:) is now without @rethrows
Func Sequence.map(_:) has generic signature change from <Self, T where Self : Swift.Sequence> to <Self, T, E where Self : Swift.Sequence, E : Swift.Error>
Func Sequence.map(_:) is now without @rethrows
Constructor Result.init(catching:) has generic signature change from <Success, Failure where Failure == any Swift.Error> to <Success, Failure where Failure : Swift.Error>
Func withUnsafePointer(to:_:) has generic signature change from <T, Result> to <T, E, Result where E : Swift.Error>
Func withUnsafePointer(to:_:) is now without @rethrows
Func withoutActuallyEscaping(_:do:) has generic signature change from <ClosureType, ResultType> to <ClosureType, ResultType, Failure where Failure : Swift.Error>
Func withoutActuallyEscaping(_:do:) is now without @rethrows

Protocol SIMDScalar has generic signature change from <Self == Self.SIMD16Storage.Scalar, Self.SIMD16Storage : Swift.SIMDStorage, Self.SIMD2Storage : Swift.SIMDStorage, Self.SIMD32Storage : Swift.SIMDStorage, Self.SIMD4Storage : Swift.SIMDStorage, Self.SIMD64Storage : Swift.SIMDStorage, Self.SIMD8Storage : Swift.SIMDStorage, Self.SIMDMaskScalar : Swift.FixedWidthInteger, Self.SIMDMaskScalar : Swift.SIMDScalar, Self.SIMDMaskScalar : Swift.SignedInteger, Self.SIMD16Storage.Scalar == Self.SIMD2Storage.Scalar, Self.SIMD2Storage.Scalar == Self.SIMD32Storage.Scalar, Self.SIMD32Storage.Scalar == Self.SIMD4Storage.Scalar, Self.SIMD4Storage.Scalar == Self.SIMD64Storage.Scalar, Self.SIMD64Storage.Scalar == Self.SIMD8Storage.Scalar> to <Self : Swift._BitwiseCopyable, Self == Self.SIMD16Storage.Scalar, Self.SIMD16Storage : Swift.SIMDStorage, Self.SIMD2Storage : Swift.SIMDStorage, Self.SIMD32Storage : Swift.SIMDStorage, Self.SIMD4Storage : Swift.SIMDStorage, Self.SIMD64Storage : Swift.SIMDStorage, Self.SIMD8Storage : Swift.SIMDStorage, Self.SIMDMaskScalar : Swift.FixedWidthInteger, Self.SIMDMaskScalar : Swift.SIMDScalar, Self.SIMDMaskScalar : Swift.SignedInteger, Self.SIMDMaskScalar == Self.SIMDMaskScalar.SIMDMaskScalar, Self.SIMD16Storage.Scalar == Self.SIMD2Storage.Scalar, Self.SIMD2Storage.Scalar == Self.SIMD32Storage.Scalar, Self.SIMD32Storage.Scalar == Self.SIMD4Storage.Scalar, Self.SIMD4Storage.Scalar == Self.SIMD64Storage.Scalar, Self.SIMD64Storage.Scalar == Self.SIMD8Storage.Scalar>
Protocol SIMDStorage has generic signature change from <Self.Scalar : Swift.Decodable, Self.Scalar : Swift.Encodable, Self.Scalar : Swift.Hashable> to <Self : Swift._BitwiseCopyable, Self.Scalar : Swift.Decodable, Self.Scalar : Swift.Encodable, Self.Scalar : Swift.Hashable>
Protocol FixedWidthInteger has generic signature change from <Self : Swift.BinaryInteger, Self : Swift.LosslessStringConvertible, Self.Magnitude : Swift.FixedWidthInteger, Self.Magnitude : Swift.UnsignedInteger, Self.Stride : Swift.FixedWidthInteger, Self.Stride : Swift.SignedInteger> to <Self : Swift.BinaryInteger, Self : Swift.LosslessStringConvertible, Self : Swift._BitwiseCopyable, Self.Magnitude : Swift.FixedWidthInteger, Self.Magnitude : Swift.UnsignedInteger, Self.Stride : Swift.FixedWidthInteger, Self.Stride : Swift.SignedInteger>