History of main 10 changes

In src/main.rs, lines 12–29 on 82202a4d0025798bbb6288e78c070c67cb8c6f409079e9364e5a109758201c99. 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.