History of main 10 changes

In src/main.rs, lines 12–29 on ce118287d9da03ef5c98345e3149109c48cf872b6813ec469ccdc2f269e6f34c. 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.