Sources/ExpressionParser/ExpressionParser.swift:6:12: warning: extraneous whitespace between attribute name and '('; this is an error in the Swift 6 language mode 4 | 5 | struct ExpressionParser { 6 | private (set) var tokens = [Token]() | `- warning: extraneous whitespace between attribute name and '('; this is an error in the Swift 6 language mode 7 | 8 | private let pattern: String これ空白があるかどうかでSwift 6モードだとエラーになるんだ。