SourceOwner

Source owners are usually parts of the UI. Code comes from buttons, from monitors, from the Code tab, from the Command Center, and so on.

SourceOwner has mainly to do with compilation and with what to do if an error occurs during compilation.

"Header source" is distinguished from "inner source" because the latter is the code the user actually wrote, while header and footer source is extra code we wrapped around it. This matters when showing code and showing positions of errors in the UI; we never want to show the user header/footer source, but error locations need to take the length of the header source into account.

See also JobOwner, which extends SourceOwner and adds methods having to do with runtime behavior and runtime error-handling.