fix: Sendable constraints

Author: andrewmd5

Sources/CSSKit/Errors.swift

@@ -80,7 +80,7 @@ extension ParseErrorKind: CustomStringConvertible where CustomError: CustomStrin
 }
 
 /// Extensible parse errors that can be encountered by client parsing implementations.
-public struct ParseError<CustomError>: Error, Equatable where CustomError: Equatable {
+public struct ParseError<CustomError>: Error, Equatable where CustomError: Equatable & Sendable {
     /// Details of this error.
     public var kind: ParseErrorKind<CustomError>
 

Sources/CSSKit/Rules/AtRuleParser.swift

@@ -11,7 +11,7 @@ protocol AtRuleParsingDelegate {
     associatedtype AtRule
 
     /// Error type for at-rule parsing failures.
-    associatedtype AtRuleError: Equatable
+    associatedtype AtRuleError: Equatable & Sendable
 
     /// Parses the prelude of an at-rule with the given name.
     func parsePrelude(

Sources/CSSKit/Rules/DeclarationParser.swift

@@ -8,7 +8,7 @@ protocol DeclarationParser {
     associatedtype Declaration
 
     /// Error type for declaration parsing failures.
-    associatedtype DeclError: Equatable
+    associatedtype DeclError: Equatable & Sendable
 
     /// Parses the value of a declaration with the given name.
     func parseValue(

Sources/CSSKit/Rules/QualifiedRuleParser.swift

@@ -11,7 +11,7 @@ protocol QualifiedRuleParser {
     associatedtype QualifiedRule
 
     /// The error type that is included in the ParseError value that can be returned.
-    associatedtype QRError: Equatable
+    associatedtype QRError: Equatable & Sendable
 
     /// Parses the prelude of a qualified rule. For style rules, this is a Selector list.
     ///

Sources/CSSKit/Rules/RuleParseError.swift

@@ -3,7 +3,7 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/
 
 /// A rule parsing error with the associated input slice.
-struct RuleParseError<E: Equatable>: Error, Equatable, @unchecked Sendable {
+struct RuleParseError<E: Equatable & Sendable>: Error, Equatable, Sendable {
     /// The underlying parse error.
     let error: ParseError<E>
 

Sources/CSSKit/Values/Color.swift

@@ -612,7 +612,7 @@ protocol ColorParser {
     /// The type that the parser will construct on a successful parse.
     associatedtype Output: ColorFactory
     /// A custom error type that can be returned from the parsing functions.
-    associatedtype Error: Equatable
+    associatedtype Error: Equatable & Sendable
 
     /// Parses an `<angle>` or `<number>`, returning degrees.
     func parseAngleOrNumber(_ input: Parser) -> Result<AngleOrNumber, ParseError<Error>>