V uses Result types for handling errors, and the developer must handle them by propagating the error or breaking/returning or panicing.

For example:

  // os.v
  fn open(path string) !File {}

  // main.v
  file := os.open('out.txt') or { panic('failed to open: $err') }
  file := os.open('out.txt') or { return }
  file := os.open('out.txt')! // propagate the error
  if file := os.open('out.txt') {} // alternative scoped syntax