History of leave 2 changes

In crates/flow/src/runner.rs, lines 749–751 on 32f54b39339668432c73fe9c37d66a616fe6b4e55f705a599c6f62b7100bce22. 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 749,751:crates/flow/src/runner.rs.