History of plural 1 change

In src/cli/format.rs, lines 15–17 on 6a9414d6a966abc9f944842291a46e5403947fe3f09c6aa19ae75f91778460aa. 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.