History of main 10 changes

In src/main.rs, lines 12–29 on dab94366a4f07768eb7bb7b508e4cb04eb877859a8e12150de3fd426d40efd05. 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.