History of main 10 changes

In src/main.rs, lines 12–29 on 8b53b935dd0366dba212be45bf9e10486f84aaf660f39c6b88c47cca89e6a8b2. 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.