diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c63b82..e92a826 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -98,6 +98,6 @@ jobs:
       - name: Check Swift Syntax Compatibility
         uses: davdroman/swift-syntax-compatibility-check@v1
         with:
-          run-tests: false
+          run-tests: true
           major-versions-only: true
           disable-prebuilts: true
diff --git a/.swiftformat b/.swiftformat
index 3c33396..5f8bbc9 100644
--- a/.swiftformat
+++ b/.swiftformat
@@ -3,15 +3,25 @@
 
 --header ignore
 --indent tab
+--tabwidth 2
+--maxwidth 120
 --ifdef no-indent
 --ranges preserve
 --extensionacl on-declarations
 --trailing-commas always
 --nil-init insert
 --import-grouping alpha
+--wrap-arguments before-first
 --wrap-conditions before-first
+--wrap-parameters before-first
+--wrap-return-type never
 --guard-else next-line
 
+# Opt-in rules
+--enable blockComments
+--enable wrapMultilineConditionalAssignment
+--enable wrapMultilineFunctionChains
+
 # Disabled rules
 --disable blankLinesAroundMark
 --disable blankLinesBetweenScopes
diff --git a/Sources/AssociationMacro/AssociatedMacro.swift b/Sources/AssociationMacro/AssociatedMacro.swift
index a0e7400..fb153ed 100644
--- a/Sources/AssociationMacro/AssociatedMacro.swift
+++ b/Sources/AssociationMacro/AssociatedMacro.swift
@@ -221,13 +221,14 @@ extension AssociatedMacro {
 		policy: ExprSyntax,
 		defaultValue: ExprSyntax?,
 	) -> AccessorDeclSyntax {
-		let typeWithoutOptional = if let type = type.as(ImplicitlyUnwrappedOptionalTypeSyntax.self) {
-			type.wrappedType
-		} else if let type = type.as(OptionalTypeSyntax.self) {
-			type.wrappedType
-		} else {
-			type
-		}
+		let typeWithoutOptional =
+			if let type = type.as(ImplicitlyUnwrappedOptionalTypeSyntax.self) {
+				type.wrappedType
+			} else if let type = type.as(OptionalTypeSyntax.self) {
+				type.wrappedType
+			} else {
+				type
+			}
 
 		return AccessorDeclSyntax(
 			accessorSpecifier: .keyword(.get),
@@ -345,7 +346,8 @@ extension AssociatedMacro {
 						type: type,
 						accessor: didSet,
 						body: body,
-					).with(\.leadingTrivia, .newlines(2))
+					)
+					.with(\.leadingTrivia, .newlines(2))
 
 					Self.callDidSet()
 				}
@@ -353,6 +355,22 @@ extension AssociatedMacro {
 		)
 	}
 
+	private static var selfCapture: ClosureCaptureSyntax {
+		let selfReference = DeclReferenceExprSyntax(baseName: .keyword(.`self`))
+		#if canImport(SwiftSyntax601)
+		return ClosureCaptureSyntax(
+			name: .keyword(.`self`),
+			initializer: .init(value: selfReference),
+		)
+		#else
+		return ClosureCaptureSyntax(
+			name: .keyword(.`self`),
+			equal: .equalToken(),
+			expression: selfReference,
+		)
+		#endif
+	}
+
 	/// `willSet` closure
 	///
 	/// Convert a willSet accessor to a closure variable in the following format.
@@ -393,10 +411,7 @@ extension AssociatedMacro {
 						value: ClosureExprSyntax(
 							signature: .init(
 								capture: .init {
-									ClosureCaptureSyntax(
-										name: .keyword(.`self`),
-										expression: DeclReferenceExprSyntax(baseName: .keyword(.`self`)),
-									)
+									Self.selfCapture
 								},
 								parameterClause: .init(ClosureShorthandParameterListSyntax {
 									ClosureShorthandParameterSyntax(name: newValue)
@@ -450,10 +465,7 @@ extension AssociatedMacro {
 						value: ClosureExprSyntax(
 							signature: .init(
 								capture: .init {
-									ClosureCaptureSyntax(
-										name: .keyword(.`self`),
-										expression: DeclReferenceExprSyntax(baseName: .keyword(.`self`)),
-									)
+									Self.selfCapture
 								},
 								parameterClause: .init(ClosureShorthandParameterListSyntax {
 									ClosureShorthandParameterSyntax(name: oldValue)
diff --git a/Sources/Swizzling/AnyHook.swift b/Sources/Swizzling/AnyHook.swift
index fd8a919..8237e93 100644
--- a/Sources/Swizzling/AnyHook.swift
+++ b/Sources/Swizzling/AnyHook.swift
@@ -81,7 +81,9 @@ public class AnyHook {
 
 	/// Validate that the selector exists on the active class.
 	@discardableResult func validate(expectedState: State = .prepared) throws -> Method {
-		guard let method = class_getInstanceMethod(`class`, selector) else { throw SwizzlingError.methodNotFound(`class`, selector) }
+		guard let method = class_getInstanceMethod(`class`, selector) else {
+			throw SwizzlingError.methodNotFound(`class`, selector)
+		}
 		guard state == expectedState else { throw SwizzlingError.invalidState(expectedState: expectedState) }
 		return method
 	}
diff --git a/Sources/Swizzling/SwizzlingHook.swift b/Sources/Swizzling/SwizzlingHook.swift
index 49d5281..fd84aa8 100644
--- a/Sources/Swizzling/SwizzlingHook.swift
+++ b/Sources/Swizzling/SwizzlingHook.swift
@@ -28,7 +28,8 @@ final class SwizzlingHook<MethodSignature, HookSignature>: TypedHook<MethodSigna
 	init(
 		`class`: AnyClass,
 		selector: Selector,
-		implementation: (SwizzlingHook<MethodSignature, HookSignature>) -> HookSignature?, // this must be optional or swift runtime will crash. Or swiftc may segfault. Compiler bug?
+		// `HookSignature?` must be optional or the Swift runtime will crash. `swiftc` may also segfault. Compiler bug?
+		implementation: (SwizzlingHook<MethodSignature, HookSignature>) -> HookSignature?,
 	) throws {
 		try super.init(class: `class`, selector: selector)
 		replacementIMP = imp_implementationWithBlock(implementation(self) as Any)
@@ -45,7 +46,9 @@ final class SwizzlingHook<MethodSignature, HookSignature>: TypedHook<MethodSigna
 		let method = try validate(expectedState: .swizzled)
 		precondition(origIMP != nil)
 		let previousIMP = class_replaceMethod(`class`, selector, origIMP!, method_getTypeEncoding(method))
-		guard previousIMP == replacementIMP else { throw SwizzlingError.unexpectedImplementation(`class`, selector, previousIMP) }
+		guard previousIMP == replacementIMP else {
+			throw SwizzlingError.unexpectedImplementation(`class`, selector, previousIMP)
+		}
 		Swizzling.log("Restored -[\(`class`).\(selector)] IMP: \(origIMP!)")
 	}
 
diff --git a/Sources/SwizzlingMacro/SwizzleMacro.swift b/Sources/SwizzlingMacro/SwizzleMacro.swift
index 5aec038..a3438d5 100644
--- a/Sources/SwizzlingMacro/SwizzleMacro.swift
+++ b/Sources/SwizzlingMacro/SwizzleMacro.swift
@@ -36,12 +36,17 @@ struct SwizzleMacro: ExpressionMacro {
 
 		let selector = firstArgument.with(\.trailingComma, nil).trimmedDescription.replacingOccurrences(of: #"\"#, with: "")
 
-		let params = node.arguments.dropFirst().prefix(while: { $0.label?.text != "returning" && $0.label?.text != "implementation" })
-		let paramTypes = if !params.isEmpty {
-			", " + params.map { $0.expression.trimmedDescription.replacingOccurrences(of: ".self", with: "") }.joined(separator: ", ")
-		} else {
-			""
-		}
+		let params = node.arguments
+			.dropFirst()
+			.prefix(while: { $0.label?.text != "returning" && $0.label?.text != "implementation" })
+		let paramTypes =
+			if !params.isEmpty {
+				", " + params
+					.map { $0.expression.trimmedDescription.replacingOccurrences(of: ".self", with: "") }
+					.joined(separator: ", ")
+			} else {
+				""
+			}
 
 		let returning = node.arguments.first(where: { $0.label?.text == "returning" })
 		let returnType = returning?.expression.trimmedDescription.replacingOccurrences(of: ".self", with: "") ?? "Void"
diff --git a/Tests/AssociationTests/PatternBindingSyntax+Tests.swift b/Tests/AssociationTests/PatternBindingSyntax+Tests.swift
index d2cc499..c739c47 100644
--- a/Tests/AssociationTests/PatternBindingSyntax+Tests.swift
+++ b/Tests/AssociationTests/PatternBindingSyntax+Tests.swift
@@ -30,7 +30,10 @@ import Testing
 struct PatternBindingSyntaxTests {
 	@Test
 	func `reads setter`() {
-		let setter = AccessorDeclSyntax(accessorSpecifier: .keyword(.set), body: .init(statements: CodeBlockItemListSyntax {}))
+		let setter = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.set),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 
 		let binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
@@ -46,7 +49,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `reads getter`() throws {
-		let getter = AccessorDeclSyntax(accessorSpecifier: .keyword(.get), body: .init(statements: CodeBlockItemListSyntax {}))
+		let getter = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.get),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 
 		var binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
@@ -59,7 +65,7 @@ struct PatternBindingSyntaxTests {
 
 		#expect(getter.description == binding.getter?.description)
 
-		/* getter only */
+		// getter only
 		let body = try #require(getter.body, "body must not be nil")
 
 		binding = .init(
@@ -74,7 +80,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `sets setter`() {
-		let setter = AccessorDeclSyntax(accessorSpecifier: .keyword(.set), body: .init(statements: CodeBlockItemListSyntax {}))
+		let setter = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.set),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 		var binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
 			accessorBlock: .init(
@@ -93,7 +102,7 @@ struct PatternBindingSyntaxTests {
 		binding.setter = newSetter
 		#expect(newSetter.description == binding.setter?.description)
 
-		/* getter only */
+		// getter only
 		binding = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
 			accessorBlock: .init(
@@ -109,7 +118,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `sets getter`() {
-		let getter = AccessorDeclSyntax(accessorSpecifier: .keyword(.get), body: .init(statements: CodeBlockItemListSyntax {}))
+		let getter = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.get),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 		var binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
 			accessorBlock: .init(
@@ -129,7 +141,7 @@ struct PatternBindingSyntaxTests {
 		binding.getter = newGetter
 		#expect(newGetter.description == binding.getter?.description)
 
-		/* getter only */
+		// getter only
 		binding = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
 			accessorBlock: .init(
@@ -142,7 +154,7 @@ struct PatternBindingSyntaxTests {
 		binding.getter = newGetter
 		#expect(newGetter.description == binding.getter?.description)
 
-		/* setter only */
+		// setter only
 		binding = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
 			accessorBlock: .init(
@@ -158,7 +170,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `willSet`() {
-		let `willSet` = AccessorDeclSyntax(accessorSpecifier: .keyword(.willSet), body: .init(statements: CodeBlockItemListSyntax {}))
+		let `willSet` = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.willSet),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 
 		let binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
@@ -174,7 +189,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `didSet`() {
-		let `didSet` = AccessorDeclSyntax(accessorSpecifier: .keyword(.didSet), body: .init(statements: CodeBlockItemListSyntax {}))
+		let `didSet` = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.didSet),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 
 		let binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
@@ -190,7 +208,10 @@ struct PatternBindingSyntaxTests {
 
 	@Test
 	func `sets willSet`() {
-		let `willSet` = AccessorDeclSyntax(accessorSpecifier: .keyword(.willSet), body: .init(statements: CodeBlockItemListSyntax {}))
+		let `willSet` = AccessorDeclSyntax(
+			accessorSpecifier: .keyword(.willSet),
+			body: .init(statements: CodeBlockItemListSyntax {}),
+		)
 
 		var binding: PatternBindingSyntax = .init(
 			pattern: IdentifierPatternSyntax(identifier: .identifier("value")),
diff --git a/mise.toml b/mise.toml
index fb5c9ba..a5307bf 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,5 +1,8 @@
 min_version = "2026.8.6"
 
+[settings]
+not_found_system_fallback = false
+
 [tool_config]
 locked = true