History of plural 1 change

In src/cli/format.rs, lines 19–21 on 8eb39658a94040047549d5519af299ea7385dd31b63de827f95a5827d5fc7030. 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 19,21:src/cli/format.rs.