History of main 10 changes

In src/main.rs, lines 12–29 on e5f8eb2a2006f2d7fc782871edc27cfefc8c7f6902198507a5fa7e8b3e768316. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 12,29:src/main.rs.