History of gc 6 changes

In src/cli/workspace.rs, lines 1598–1633 on 5552e69c732539b5d251a7dd1c650de7e26e4339f679ec08675af0b6867517d5. 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 1598,1633:src/cli/workspace.rs.