https://github.com/apple/swift/pull/14505 これ多分僕が投げたPRでエンバグして、 @norio_nomura が報告して、 @rintaro が直してる・・・

[Lexer] Don't setEscapedIdentifier(true) for tok::eof at ArtificialEOF by rintaro · Pull Request #14505 · apple/swift

SR-6926 rdar://problem/37290899 This happens when the Parser re-lexing comment tokens that sets ArtificialEOF at the end of comment range. It used to cause an assertion failure (!value || Kind == t...