History of plural 1 change

In src/cli/format.rs, lines 18–20 on 132b884b9a8d9894c9ad7624370a26285446f9d49dbfc762e1ef16e0a2e88133. 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 18,20:src/cli/format.rs.