History of main 10 changes

In src/main.rs, lines 12–29 on d8524a9f01170fa2f4e3300332530ad57ba8f6ed9e05568dbc9eb3babc8aae1f. 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.