docs(meta): trim glossary entries that restated their rules, and sharpen the drift note - #162
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…pen the drift note The two entries that drifted on #160 were the two longest in the file, and that is not a coincidence: an entry which reproduces its rule's structure — the enumeration, the exceptions, the cross-cutting conditions — is the only kind that can contradict its canonical home. Glossary §1 already asks for 'only a short summary, not the full rule'. Trimmed the nine entries that restated rules they do not own (carried guest, owner, arena placement, guest source, guest, move-source, boxed member, unified type parameters, passing mode, deep value copy, product/sum/ peer mould). Every detail removed was verified present in the canonical home first. Longest entry drops 203 -> 70 words, none now over 70, median unchanged at 47. CLAUDE.md's note said to grep the glossary after changing a rule. That catches one of the three incidents. It now also records the other failure mode: an entry rewritten in the same commit as the rule still shipped a false sentence, because a sentence scoped to one rule among several reads unchanged once that rule becomes the only one. When rewriting an entry, the untouched sentences are the ones to re-read.
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📝 WalkthroughWalkthroughThe PR expands glossary-editing guidance and shortens multiple glossary definitions. Detailed lifetime, storage, construction, movement, and ownership rules now remain outside the glossary entries. ChangesGlossary consolidation
Merge Risk: 🟡 Moderate · up to The glossary currently gives conflicting guidance about whether a value-type subject is a guest or a borrow, and the carried-guest wording may omit direct reference members; the new review guidance also overstates the safety of short entries. These localized correctness issues should be fixed before merging. Possibly related PRs
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Inline comments:
In `@CLAUDE.md`:
- Around line 49-51: Update the guidance around the “Length is the mechanism”
statement to remove the absolute claim that two-sentence entries cannot
contradict canonical rules; replace it with probabilistic wording acknowledging
that concise entries can still contain false summaries and require semantic
review.
In `@spec/glossary.md`:
- Line 273: Update the carried-guest definition to traverse zero or more owning
edges, so a direct & member of the declared value type is included; continue
stopping at each & without traversing into the referenced object.
- Line 248: Update the subject-parameter description in §3.37 to match §3.38: do
not state that `this` is always a guest, and describe value-type subjects as
borrows while preserving the correct behavior for reference-type subjects.
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CLAUDE.mdspec/glossary.md
…the length note Three review findings, all valid. Trimming §3.42 cut 'a type's own & field is the shortest case, found after no edges at all' as redundant. It was not: #160 added that clause to close exactly the reading it reintroduced, since a direct & member is reached after zero owning edges and 'reachable by following owning edges' can be read as excluding it. Restored as an explicit zero-or-more traversal. §3.37 said the subject parameter 'is always a guest'. True of a reference-type subject only — a value-type this is a borrow, which §3.38 says two entries later. The claim predates this PR; the trim preserved it because I re-read what I changed rather than what I kept, which is the failure the note in this same commit describes. CLAUDE.md claimed a two-sentence entry cannot contradict its canonical home. A short entry can be plain wrong; what it cannot do is go stale, having reproduced no structure to fall out of sync. Also records that a clause which looks like padding is sometimes a previous reviewer's fix, and to check with git log -S before cutting one.
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Follow-up to #160, where two glossary entries drifted from rules they don't own. Both were caught in review rather than by me, which is now three times on this repo.
The finding
I measured the
Meaningfield of all 54 entries. Median 51 words; eleven over 70; longest 203 and 179 — and those two werecarried guestandowner, the exact pair that had just drifted.That correlation is the point. An entry that reproduces its rule's structure — the enumeration, the exceptions, the cross-cutting conditions — is the only kind that can contradict its canonical home. A two-sentence entry has nothing to contradict with. Glossary §1 already asks for "only a short summary, not the full rule"; the entries that drifted were the ones that had quietly stopped honouring it.
What was trimmed
carried guestlifetimes.md§1.10'sowner&-boundary rule, the block-is-one-lifetime clause, the travel clausearena placementmemory.md§3.5guestmove-sourceboxed memberunified type parameterspassing modedeep value copyguest sourceproduct / sum / peer mould{ }vs[ ]body grammarMax is now 70, none over, median unchanged at 47 — the short entries were not touched, only the ones that had grown into rule restatements.
Every removed detail was verified present in its canonical home before cutting. The one worth naming:
boxed member's "two questions" clause doesn't appear inadt.mdunder that phrasing, so grep missed it — it's there in §4 ("A recursive member owns its child… In a reference type that ownership is hosting… In a value type it is ordinary value ownership"), worded differently.The
CLAUDE.mdnoteThe existing instruction — grep the glossary after changing a rule — catches the
ownerincident. It does not catch thecarried guestone, and that's the gap worth recording:"A value carrying no guest is never re-checked"was true when written, when it meant one rule among several never fired. Once that rule became the only rule, it read as "no check at all" and was false — while the sentence itself was never edited. When you rewrite an entry, the sentences you did not touch are the ones to re-read; their meaning is set by the ones you did.Checks
receivergrep: 1 hit, the expected story pointer infunctions.md§2.1.stories/untouched — no diff, so the append-only rule is not in play.No normative rule changed. Every edit is a deletion from a summary whose canonical home already carries the text, plus the agent note.
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