     XCTAssert(jobs.count == 1)
     XCTAssertEqual(jobs.first!.tool.name, "/usr/bin/nonexistent-swift-help")
   }
-  
+
   func testSourceInfoFileEmitOption() throws {
     // implicit
     do {

      XCTAssertEqual(plannedJobs.map(\.kind), [.compile, .link])
      XCTAssertTrue(plannedJobs[1].commandLine.contains("-lto_library"))
    }
    
    do {
      var driver = try Driver(args: ["swiftc", "foo.swift", "-lto=llvm-thin", "-lto-library", "/foo/libLTO.dylib", "-target", "x86_64-apple-macos11.0"])
      let plannedJobs = try driver.planBuild()

        return
      }
    }

    XCTAssertThrowsError(try Driver(args: ["swiftc", "-c", "-static-stdlib", "-target", "x86_64-apple-macosx10.14",
                                           "foo.swift"])) { error in
      guard case DarwinToolchain.ToolchainValidationError.argumentNotSupported("-static-stdlib") = error else {
