History of issue 4 changes

In crates/oh/src/main.rs, lines 930–1037 on cb7b3cd45dc092cb7101d98f4cdb8d7b7f6f8b79e4044368dc952513ae14353b. 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 930,1037:crates/oh/src/main.rs.