History of main 10 changes

In src/main.rs, lines 12–29 on e980087ed0b1f55e860ad4e186df47d4577445c0591ca6f5d97ea73a2cdc7589. 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.