History of main 10 changes

In src/main.rs, lines 12–29 on 2aa1854b0d1311b330db24ec73e364035eb41f5eb80c32e2edd701aa316341a3. 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.