History of main 10 changes

In src/main.rs, lines 12–29 on ac4ec124b9f2fa52ea27d682b54225cf95a771daf8fb4ab7f5ab53410ef19286. 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.