History of main 1 change

In crates/jet/examples/scan.rs, lines 1–20 on 89171fca079c76d2eeee185ded4654827fea8834b4e6c5fdc2a337465af1e43f. 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 1,20:crates/jet/examples/scan.rs.