History of issue 4 changes

In crates/oh/src/main.rs, lines 773–880 on 5360cea36c30a7236e2fb61a89c48f7cc65132f1af97caae4780e8b664ee15ea. 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 773,880:crates/oh/src/main.rs.