func process(line: UInt = #line, fn: () -> Void) {}
func process(line: UInt = #line) -> Int { return 0 }
func dangerous() throws {}

func test() {
  process {
    try dangerous()
    test()
  }
}

<stdin>:6:11: error: invalid conversion from throwing function of type '() throws -> ()' to non-throwing function type '() -> Void'
  process {
          ^