History of label 3 changes

In crates/oh/src/main.rs, lines 2136–2167 on v0.9.19. 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 2136,2167:crates/oh/src/main.rs.