History of main 10 changes

In src/main.rs, lines 12–29 on f2f91ceb0e9f3b142481ddf2e851fa037beb14cc00a186b7cfe61bf45b030ba4. 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.