History of run 6 changes

In src/main.rs, lines 169–487 on abaa8d517631ec656cc019738283b6c4dceeea9b6f9e1d8423936b8dbd5c4daa. 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 169,487:src/main.rs.