History of main 10 changes

In src/main.rs, lines 12–29 on ff6987682725f3184da6505b62cbb51158c4508ebb5100600b668c6ef4d9e9ca. 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.