History of main 10 changes

In src/main.rs, lines 12–29 on 44f1ebe7aa5b73866f02f4194eb0d41266d4d7f4d47486b63ba9c78f7e1f58ae. 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.