History of main 10 changes

In src/main.rs, lines 12–29 on 642da2636de23fd2aee00ace74e1ec4abace8241fb73d3f30519be0fdc1d4c8c. 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.