History of plural 1 change

In src/cli/format.rs, lines 18–20 on 6d3eefbce2f0337e9519167768ce61c6037288658944904e8e83bd0da13ada92. 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.