History of kernel 1 change

In crates/flow/src/facts.rs, lines 40–42 on 3554afefb6aadff470e78828d68179b027f263578059e715a80fc65f5b20561c. 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 40,42:crates/flow/src/facts.rs.