History of main 10 changes

In src/main.rs, lines 12–29 on e02edccce98c08b0fb114910cd9e0cffea9f430529ec76ac8ebfda36d145b6b6. 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.