History of main 10 changes

In src/main.rs, lines 12–29 on aa137bb8e77d7078508373ca5864ec23cc072164b9cd2c10407798ee85a8bc3e. 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.