History of main 10 changes

In src/main.rs, lines 12–29 on ebb9210bad0c3ac1b8c02e46b6c24469f0ea951ab2e1c6580338ba53bd69732e. 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.