History of main 10 changes

In src/main.rs, lines 12–29 on aa4939e07a092789f94655dab78135c3cb4f7dda9626ce2baebf51a63611782e. 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.