sage-4112 / #1825 added package line scan
Input: git diff -U0 1f3d0350f -- packages, filtered by grep ^+
Final grep -i -E used exactly the ruling pattern.
Matches: 0. grep stdout: empty. grep exit: 1 (no match).
Only package delta from ec8cb10c0: two constant values, one replacement line each.
Each value length: 19. Exact repository matches: one source definition each.
All remaining source bytes and assertions equal r5.
