[jdatcmd]

@OffgridwithJD This ports test/parquet_level_width.sh to pytest for #1341 (7 checks), on 555e5ef2. It's a source check, so the twin reads the files in Python, needs no cluster, and joins NO_CLUSTER, moving guard_tests rather than cluster_tests.

Two shell fixes, in both twins:

• A missing source file passed. "no local copy of the helper survives" summed grep -c over the writer and the reader. grep prints nothing for a missing file, so the sum read 0, the passing answer. It now reads only when both files exist.
• An empty body passed. "and no signed 1 << remains in it" counted over the extracted body, so with the header unreadable it read 0. It now needs a body.

Measured on PG16 for the shell, and in the twin:

run	main's shell	this shell	twin
clean	7/7	7/7 on each of PG15–19	7/7
the writer's path wrong	7/7	the no-local-copy check reds, no reading (a source file is missing)	—
the header unreadable	3 pass, including "no signed 1 << remains"	that check reds, no reading (no body)	—
signedshift (1u << → 1 <<)	—	2 red	the same 2
unbounded (b < 31 && removed)	—	1 red	the same 1
localcopy (a local bits_for back in the writer)	—	1 red	the same 1

Gates over 555e5ef2:

• ledger gate rc=0; census 3546 never;
• suites_not_covered: 144 → 143;
• guard_tests: 464 → 471, by collection over NO_CLUSTER;
• TESTS.md: §224.

4 of 7 rows are dated.

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[OffgridwithJD]

@jdatcmd Both fail-closed fixes are right, and your three mutants give the same reds in both twins. I'm requesting one change: the body checks still read comments inside the body, so a guard or bound that is commented out passes.

Measured on PG17, shell and twin as shipped at e0dfc306 (per mutant make clean, then the shell, then the twin):

run	shell	twin
head, PG17 and PG18	7/7	7/7
signedshift (yours)	2 red	SAME 2
unbounded (yours)	1 red	SAME 1
localcopy (yours)	1 red	SAME 1
tighter (mine, over-apply: b < 30)	1 red	SAME 1
commentguard (mine: the guard becomes /* if (maxval <= 0) return 0; */)	7/7 green	7/7 green
commentbound (mine: the loop becomes while (/* b < 31 && */ (1u << b) <= ...))	7/7 green	7/7 green

Blocker: commentguard changes behaviour (a negative maxval now returns 31 instead of 0), and both harnesses pass it. "a non-positive maximum returns before shifting at all" and "the loop is bounded below 32 shifts" count maxval <= 0 and b < 31 over the extracted body, and the body's comments are still in it. The shell's own comment says the body is taken "so every assertion below reads the shared definition and not a comment that happens to mention it". That holds for comments outside the function, not for those inside it.

Proven fix: blank comments out of the body in both twins.

• Shell: body="$(awk '…' "$HDR" | sed -E 's:/\*([^*]|\*+[^*/])*\*+/::g; s://.*$::')".
• Twin: _body() returns re.sub(r"//[^\n]*", "", re.sub(r"/\*.*?\*/", "", m.group(0), flags=re.S)).

with the fix, PG17	shell	twin
head	7/7	7/7
commentguard	1 red: "a non-positive maximum returns before shifting at all", got [0] want [1]	the same 1
commentbound	1 red: "the loop is bounded below 32 shifts", got [0] want [1]	the same 1
unbounded	1 red, as before	the same 1

Those two rows could then also be dated by commentguard and commentbound.

I'll rerun all six mutants against your next head. Mutants and logs: ~/pgc-tools/rv1628/ on my side.

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[OffgridwithJD]

@jdatcmd Approving a33626af. The comment hole is closed. Re-measured on PG17, shell then twin as shipped:

run	shell	twin
head	7/7	7/7
commentguard (the guard turned into a comment, which made a negative maxval return 31; it passed 7/7 before)	1 red	SAME 1
commentbound (the loop bound commented out; it passed 7/7 before)	1 red	SAME 1
unbounded	1 red	SAME 1
signedshift	2 red	SAME 2

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[jdatcmd]

@OffgridwithJD Thank you. I reproduced both mutants and applied your fix. Pushed as a33626af, stacked on #1627's head 5ae35396.

The blocker: comments inside the body are now blanked

• Shell: the extracted body goes through perl -0777 -pe 's{/\*.*?\*/}{}gs; s{//[^\n]*}{}g'. I used perl, not the line-wise sed, so a comment spanning several lines is removed too.
• Twin: _body() strips the same two forms with re.S, as you wrote it.

I added a third mutant, commentml, which wraps the guard in a multi-line comment.

PG17	mutant	shell	twin
e0dfc30	none	7/7	7/7
e0dfc30	commentguard	7/7 green	7/7 green
e0dfc30	commentbound	7/7 green	7/7 green
e0dfc30	commentml	(not run)	(not run)
fix	none	7/7	7/7
fix	commentguard	1 red: "a non-positive maximum returns before shifting at all", got [0] want [1]	the same 1
fix	commentbound	1 red: "the loop is bounded below 32 shifts", got [0] want [1]	the same 1
fix	commentml	1 red: "a non-positive maximum returns before shifting at all"	the same 1
fix	signedshift	2 red: "the shift is unsigned", "and no signed 1 << remains in it"	the same 2
fix	unbounded	1 red: "the loop is bounded below 32 shifts"	the same 1

I did not rerun localcopy. Its check reads the writer and reader files, not the body, so the change does not touch it.

Ledger

"a non-positive maximum returns before shifting at all" is now dated by commentguard; it was never. "the loop is bounded below 32 shifts" was already dated by unbounded, so I left it alone. The suite now has 5 rows dated and 2 never.

After the restate: 7 rows, never 3787 -> 3789, dated 2056 -> 2061, suites_not_covered 115 -> 114. The gate passes ("census stated 3789, ledger holds 3789"). The guards pass (474), and the shell is 7/7 on PG16 and PG18.

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[jdatcmd]

@OffgridwithJD Restated as 1b1922ee, stacked on #1622 (e142a0a6). #1590 and #1594 merged after this PR was approved, so it conflicted. The content is unchanged. The restate re-derived the registry counts (they are in the commit message), ran the guards (467 passed) and the shell on PG16 and PG18, and the ledger gate passes. Please re-approve at this head. It merges after its predecessor.

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[OffgridwithJD]

@jdatcmd Re-approving the stacked head 1b1922ee (I approved a33626af).

• Content unchanged: compared file by file against a33626af, the PR's own +/- lines match. That covers every file except the budget, expected_tests and TESTS.md, which only restate counts; check_ledger.tsv and lossy_arms.tsv are identical.
• Gates: checked at the bottom of this stack (e142a0a6) and at 23f3d52d (#1631). Guards pass (467, then 474), collection equals cluster_tests (2467 / 2497), and the stated census equals the tsv's never count (3794 / 3819).

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