History of plural 1 change

In src/cli/format.rs, lines 15–17 on aedfe465b611278f7536c1db29e753f7e9489ce8e691eb41e6bbdd49885fc604. 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.