History of main 10 changes

In src/main.rs, lines 12–29 on 2b95bc24d7d6b8ddeaed76a2bf1320404a2c2edd5259a3650da2ae0a80a1c579. 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.