History of main 10 changes

In src/main.rs, lines 12–29 on 1db74949c8768c8dca1ea7ea88a1fe18a49588726d5328ff94d77019508da969. 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.