History of issue 4 changes

In crates/oh/src/main.rs, lines 918–1025 on 965b950f9b9657901127c61c6b689afee7d0c564d08d767a566a24a4719a3b59. 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 918,1025:crates/oh/src/main.rs.