History of main 10 changes

In src/main.rs, lines 12–29 on 91334b7fa5748e15146a231bb0caf79c2016d1306d7a015a93c7b355fdcec845. 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.