/Users/norio/github/swiftfmt/Sources/swiftfmt-core/AlignmentFormatter.swift:9:8: error: no such module 'SwiftSyntax' import SwiftSyntax ^/Users/norio/github/swiftfmt/Sources/swiftfmt-core/AlignmentFormatter.swift:9:8: error: no such module 'SwiftSyntax' import SwiftSyntax ^swiftc -frontend -emit-syntax は動きます。