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C2: probe the 31+ digit intermediate on the oracle (Part of #4702) - #5502
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… difference (Part of #4702) cobc -std=ibm keeps a 36-digit A * B whole; IBM ARITH(COMPAT) truncates to 30. Probe output quoted in the register entry and pinned by a Docker-gated test. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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What
register/C2.mdsaid the 30-digit intermediate cap was "not measured". Measured on the pinned imagegitgalaxy-gnucobol:3(GnuCOBOL 3.1.2,cobc -x -std=ibm), A and BPIC 9(18)= 999999999999999999 (A * B is 36 digits):All exact: the oracle applies no cap and no warning. IBM ARITH(COMPAT) truncates the 36-digit product to 30 digits, so this is a declared difference (status stays DIFFERS). Pinned by
tests/cobol_mainframe/test_oracle_intermediate_cap.py(Docker-gated,EQUIVALENCE_E2E=1). "To settle" now leaves only the z/OS side (Part 2, blocked).Burned estates: none reaches a 31+ digit intermediate (per the entry's det sweep), so no proof is affected.
Gates
register.py --checkok;audit_check.pyall clear; new test passes with plainpytestfrom/tmp.Sibling gaps
None new in a burned estate. C5 (ARITH(EXTEND) stop) already covered; z/OS side of C2 is Part 2.
Checklist: done [c:a6529073]
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