History of main 10 changes

In src/main.rs, lines 12–29 on 74b4a3c62ea49a14291109dfc144c7f840f6af35c6a9e8f150ce53528fdf6e04. 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.