History of issue 4 changes

In crates/oh/src/main.rs, lines 773–880 on 2a0c09c097168374c2744f61ae27875085372b77ea0d698de042d7777000cdc2. 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.