History of run 4 changes

In src/main.rs, lines 131–367 on 86e682c242c6d7cf28e6c0b3df731c14dc7fd6936744b213ed8fb9bafea7dd0d. 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 131,367:src/main.rs.