History of main 10 changes

In src/main.rs, lines 12–29 on c0d4075cadc08ad8f82059238de1df8c82df07c5431aa1d99335d80fb1357e65. 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.