let package = Package( name: "SwiftSyntax-issue-ellipsis", products: [ .executable(name: "SwiftSyntax-issue-ellipsis", targets: ["SwiftSyntax-issue-ellipsis"]), ], dependencies: [ .package(url: "https://github.com/apple/swift-syntax.git", .revision("swift-4.2-DEVELOPMENT-SNAPSHOT-2018-08-25-a")), ], targets: [ .target(name: "SwiftSyntax-issue-ellipsis", dependencies: ["SwiftSyntax"]), .testTarget(name: "SwiftSyntax-issue-ellipsisTests", dependencies: ["SwiftSyntax-issue-ellipsis"]), ] )swift-DEVELOPMENT-SNAPSHOT-2018-08-25-a こっちはビルドできた。