Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

module.modulemap
module error {
  header "error.h"
}

module use_error_a {
  header "use_error_a.h"
  export error
}

module use_error_b {
  header "use_error_b.h"
  export error
}