History of plural 1 change

In src/cli/format.rs, lines 15–17 on 2ddd471651cd8ba71992cdcc29c5bc42b3094d0f567322143900cf218fd66466. 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 15,17:src/cli/format.rs.