History of main 10 changes

In src/main.rs, lines 12–29 on 0ed150d629943b0d9b630d67e32c0215ba61b104b56f9e02107768ddea10478c. 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.