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packages/pigeon/example/app/ios/Runner/Messages.g.swift

@@ -175,14 +175,14 @@ class ExampleHostApiSetup {
 }
 /// Generated protocol from Pigeon that represents Flutter messages that can be called from Swift.
 protocol MessageFlutterApiProtocol {
-  func flutterMethod(aString aStringArg: String?, completion: @escaping (Result<String, FlutterError>) -> Void) 
+  func flutterMethod(aString aStringArg: String?, completion: @escaping (Result<String, FlutterError>) -> Void)
 }
 class MessageFlutterApi: MessageFlutterApiProtocol {
   private let binaryMessenger: FlutterBinaryMessenger
   init(binaryMessenger: FlutterBinaryMessenger){
     self.binaryMessenger = binaryMessenger
   }
-  func flutterMethod(aString aStringArg: String?, completion: @escaping (Result<String, FlutterError>) -> Void)  {
+  func flutterMethod(aString aStringArg: String?, completion: @escaping (Result<String, FlutterError>) -> Void) {
     let channel = FlutterBasicMessageChannel(name: "dev.flutter.pigeon.pigeon_example_package.MessageFlutterApi.flutterMethod", binaryMessenger: binaryMessenger)
     channel.sendMessage([aStringArg] as [Any?]) { response in
       guard let listResponse = response as? [Any?] else {

packages/pigeon/lib/swift_generator.dart

@@ -882,7 +882,7 @@ String _getMethodSignature(Method func) {
       : _nullsafeSwiftTypeForDartType(func.returnType);
 
   if (func.arguments.isEmpty) {
-    return 'func ${func.name}(completion: @escaping (Result<$returnType, FlutterError>) -> Void) ';
+    return 'func ${func.name}(completion: @escaping (Result<$returnType, FlutterError>) -> Void)';
   } else {
     final Iterable<String> argTypes = func.arguments
         .map((NamedType e) => _nullsafeSwiftTypeForDartType(e.type));
@@ -895,7 +895,7 @@ String _getMethodSignature(Method func) {
     final String argsSignature = map3(argTypes, argLabels, argNames,
             (String type, String label, String name) => '$label $name: $type')
         .join(', ');
-    return 'func ${components.name}($argsSignature, completion: @escaping (Result<$returnType, FlutterError>) -> Void) ';
+    return 'func ${components.name}($argsSignature, completion: @escaping (Result<$returnType, FlutterError>) -> Void)';
   }
 }