History of help_tests::walk 1 change

In src/cli/mod.rs, lines 1558–1575 on aa137bb8e77d7078508373ca5864ec23cc072164b9cd2c10407798ee85a8bc3e. 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 1558,1575:src/cli/mod.rs.