History of main 10 changes

In src/main.rs, lines 12–29 on b63fc7a77fc6e79d1acf216a9a0bc47bfeccd51b96e9a0337d16dec00bfeb4a7. 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.