History of main 10 changes

In src/main.rs, lines 12–29 on d0bf2da150949093a1d5207bde8a4f69c55599bd7de6db7eca460e6376fbae41. 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.