History of main 10 changes

In src/main.rs, lines 12–29 on c9369ad8b1b153b2493c3fafb5ab2a404dc86e0a356b1694469753c9bdd6a230. 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.