History of main 10 changes

In src/main.rs, lines 12–29 on b5e98094eb8fc7123b7331db9a051e6deb771db299e8ab60b6d3e5312d1e6dd3. 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.