- parser `empty` no-target → (ref "me") (was bogus (sym "me"))
- parser `halt` modes distinguish: "all"/"bubbling"/"default" halt execution
(raise hs-return), "the-event"/"the event's" only stop propagation/default.
"'s" now matched as op token, not keyword.
- parser `get` cmd: dispatch + cmd-kw list + parse-get-cmd (parses expr with
optional `as TYPE`). Required for `get result as JSON` in fetch chains.
- compiler empty-target for (local X): emit (set! X (hs-empty-like X)) so
arrays/sets/maps clear the variable, not call DOM empty on the value.
- runtime hs-empty-like: container-of-same-type empty value.
- runtime hs-empty-target!: drop dead FORM branch that was short-circuiting
to innerHTML=""; the querySelectorAll-over-inputs branch now runs.
- runtime hs-halt!: take ev param (was free `event` lookup); raise hs-return
to stop execution unless mode is "the-event".
- runtime hs-reset!: type-aware — FORM → reset, INPUT/TEXTAREA → value/checked
from defaults, SELECT → defaultSelected option.
- runtime hs-open!/hs-close!: toggle `open` attribute on details elements
(not just the prop) so dom-has-attr? assertions work.
- runtime hs-coerce JSON: json-stringify dict/list (was str).
- test-runner mock: host-get on List + "length"/"size" (was only Dict);
dom-set-attr tracks defaultChecked / defaultSelected / defaultValue;
mock_query_all supports comma-separated selector groups.
- generator: emit boolean attrs (checked/selected/etc) even with null value;
drop overcautious "skip HS with bare quotes or embedded HTML" guard so
morph tests (source contains embedded <div>) emit properly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Load sx/sx/geography/cek/ recursively so content/demo/freeze index.sx
pages bind as ~geography/cek/{content,demo,freeze}. Update docs.sx
cek-page dispatch + test-examples cek:content-pages suite to reference
those real names (were stale ~geography/cek/cek-content etc.).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Update test-examples.sx to reference the real path-derived names
(~geography/<domain>/<stem>) instead of short aliases, drop the
alias chains in run_tests.ml, and add marshes/_islands loading so
the migrated one-per-file islands resolve. Fix the try-rerender-page
stub in boot-helpers.sx to accept the 3 args its callers pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Why: the one-per-file migration leaves `defcomp`/`defisland` unnamed in each
file; the test runner now walks `_islands/` recursively and injects a name
derived from the relative path (e.g. `geography/cek/_islands/demo-counter.sx`
→ `~geography/cek/demo-counter`), matching the runtime's path-based naming.
JIT-vs-CEK test parity: both now pass 3938/534 (identical failures).
Three fixes in sx_vm.ml + run_tests.ml:
1. OP_CALL_PRIM: fallback to Sx_primitives.get_primitive when vm.globals
misses. Primitives registered after JIT setup (host-global, host-get,
etc. bound inside run_spec_tests) become resolvable at call time.
2. jit_compile_lambda: early-exit for anonymous lambdas, nested lambdas
(closure has parent — recreated per outer call), and a known-broken
name list: parser combinators, hyperscript parse/compile orchestrators,
test helpers, compile-timeout functions, and hs loop runtime (which
uses guard/raise for break/continue). Lives inside jit_compile_lambda
so both the CEK _jit_try_call_fn hook and VM OP_CALL Lambda path
honor the skip list.
3. run_tests.ml _jit_try_call_fn: catch TIMEOUT during jit_compile_lambda.
Sentinel is set before compile, so subsequent calls skip JIT; this
ensures the first call of a suite also falls back to CEK cleanly when
compile exceeds the 5s test budget.
Also includes run_tests.ml 'reset' form helpers refactor (form-element
reset command) that was pending in the working tree.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- call: use make-symbol for fn name, rest-rest for args (was string + nth)
- on: extract (ref ...) nodes from body as event.detail let-bindings
- host-set!: add ListRef+Number case for array index mutation
- append!: support index 0 for prepend
- hs-put!: branch on list? for array start/end operations
- hs-reset!: form reset restoring defaultValue/checked/textContent
- 522/793 pass (was 493/754)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Parser:
- halt default/bubbling: match ident type (not just keyword)
- halt the event's: consume possessive marker
Runtime:
- hs-halt! dispatches: default→preventDefault, bubbling→stopPropagation,
event→both
Mock DOM:
- Add event method dispatch: preventDefault, stopPropagation,
stopImmediatePropagation set correct flags on event dict
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
cek_run's resolver → cek_resume doesn't propagate values correctly
(likely a kont frame ordering issue in the transpiled evaluator).
Workaround: use _cek_io_suspend_hook which receives the suspended
state and manually steps to completion, handling further suspensions.
- resolve_io: shared function for IO resolution (sleep, fetch, etc.)
- Suspend hook: manual step loop after cek_resume, handles nested IO
- run_with_io: uses req_list extraction (handles ListRef)
- Fixes fetch tests: 10 now pass (response format correct)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The run_with_io suspension handler wasn't matching IO requests because
SX lists can be ListRef (mutable) not just List (immutable). Fixed by
extracting the underlying list first, then pattern matching on elements.
Also:
- Added io-sleep/io-wait/io-settle/io-fetch handlers to run_with_io
- Rebound try-call inside run_spec_tests to use eval_with_io
- io-fetch returns "yay" for text, {foo:1} for json, response dict
This enables perform-based IO (wait, fetch) to work in test execution,
fixing ~30 tests that previously returned empty strings.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
IO Suspension:
- Set _cek_io_resolver in test runner to handle perform/wait/fetch
- io-sleep/io-wait: instant resume (no real delay in tests)
- io-fetch: returns mock {ok:true, status:200, json:{foo:1}} response
- io-wait-for/io-settle: instant resume
- Fixes ~30 tests that were failing with VmSuspended or timeouts
Append command:
- hs-append (pure): string concat or list append
- hs-append! (effectful): DOM insertAdjacentHTML
- Compiler emits set! wrapper for variable targets
Mock DOM:
- dom_stringify handles List → comma-separated string
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Compiler:
- append to symbol → (set! target (hs-append target value))
- append to DOM → (hs-append! value target)
Runtime:
- hs-append: pure function for string concat and list append
- hs-append!: DOM insertAdjacentHTML for element targets
Mock DOM:
- dom_stringify handles List by joining elements with commas
(matching JS Array.toString() behavior)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Parser:
- Reorder toggle style parsing: target before between clause
- Handle "indexed" keyword, "indexed by" syntax
- Use parse-atom (not parse-expr) for between values to avoid
consuming "and" as boolean operator
- Support 3-4 value cycles via toggle-style-cycle
Compiler:
- Add toggle-style-cycle dispatch → hs-toggle-style-cycle!
Runtime:
- Add hs-toggle-style-between! (2-value toggle)
- Add hs-toggle-style-cycle! (N-value round-robin)
Mock DOM:
- Parse CSS strings from setAttribute "style" into style sub-dict
so dom-get-style/dom-set-style work correctly
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Parser:
- Relax (number? v) to v in parse-one-transition so (expr)unit works
- Add (match-kw "then") before parse-cmd-list in parse-for-cmd
- Handle "indexed by" syntax alongside "index" in for loops
- Add "indexed" to hs-keywords to prevent unit-suffix consumption
Compiler:
- Use map-indexed instead of for-each for indexed for-loops
Test generator:
- Preserve \" escapes in process_hs_val via placeholder/restore
Mock DOM:
- Coerce insertAdjacentHTML values via dom_stringify (match browser)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- inject_path_name: strip _islands/ convention dirs from path-derived names
- page-functions.sx: fix geography (→ ~geography) and isomorphism (→ ~etc/plan/isomorphic)
- request-handler.sx: rewrite sx-eval-page to call page functions explicitly
via env-get+apply, avoiding provide special form intercepting (provide) calls
- sx_server.ml: set expand-components? on AJAX aser paths so server-side
components expand for the browser (islands stay unexpanded for hydration)
- Rename 19 component references in geography/spreads, geography/provide,
geography/scopes to use path-qualified names matching inject_path_name output
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The handler dispatch (api.* paths) now checks for HX-Request header.
If present, the SX aser output is rendered to HTML via sx_render_to_html
before sending. SX-Request (from SX client navigation) still gets SX
wire format. This makes hx-* attributes work like real htmx — the
server returns HTML fragments that htmx can swap into the DOM.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Previously these primitives threw Eval_error if either arg was non-string.
Now they return false, preventing crashes when DOM attributes return nil
values during element processing (e.g. htmx-boot-subtree! iterating
elements with undefined attribute names).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The htmx-boot-subtree! function (defined in lib/hyperscript/htmx.sx)
was never loaded in the browser because hs-htmx.sx wasn't in the
bundle or compile-modules lists. Added to:
- bundle.sh: copy htmx.sx as hs-htmx.sx to dist
- compile-modules.js: compile to hs-htmx.sxbc, add to deps and lazy list
This was the root cause of "Load Content" button not working —
hx-* attributes were never activated because htmx-boot-subtree!
was undefined.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
htmx sends HX-Request header on AJAX calls. The server now detects this
and renders the SX response to HTML via sx_render_to_html before sending.
SX-Request (from SX client navigation) still gets SX wire format.
Also skip response cache for htmx requests (they need fresh HTML renders).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When an error occurs during resumed VM execution (after perform/hs-wait),
resume_vm now checks the VM's handler_stack. If a handler exists (from a
compiled guard form's OP_PUSH_HANDLER), it unwinds frames and jumps to
the catch block — exactly like OP_RAISE. This enables try/catch across
async perform/resume boundaries.
The guard form compiles to OP_PUSH_HANDLER which lives on the vm struct
and survives across setTimeout-based async resume. Previously, errors
during resume escaped to the JS console as unhandled exceptions.
Also restored guard in the test runner (was cek-try which doesn't survive
async) and restored error-throwing assertions in run-action.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The guard form (call/cc + handler-bind expansion) doesn't survive async
IO suspension — the CEK continuation from guard's call/cc captures frames
that become invalid after the VM resumes from hs-wait. Replacing guard
with cek-try (which compiles to VM-native OP_PUSH_HANDLER/OP_POP_HANDLER)
avoids the CEK boundary crossing.
The test runner now executes: suspends on hs-wait, resumes, runs test
actions, and test assertions fire correctly. The "Not callable: nil"
error is eliminated. Remaining: test assertion errors from iframe content
not loading fast enough (timing issue, not a framework bug).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The Not callable: nil error happens on a stub VM (frames=[], sp=0) during
cek_resume with 12 CEK kont frames. The error is from a reactive signal
subscriber (reset! current ...) that triggers during run vm after resume.
The subscriber callback goes through CEK via cek_call_or_suspend and the
CEK continuation tries to call nil.
This is a reactive subscriber notification issue, not a perform/resume
frame management issue. The VM frames are correctly restored — the error
happens during a synchronous reset! call within the resumed VM execution.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Shows pending_cek, reuse_stack count, and frames count in the error.
Also transfers reuse_stack from _active_vm at VmSuspended catch sites.
Finding: the Not callable: nil happens during cek_resume (pending_cek=false,
kont=12 frames). The CEK continuation tries to call a letrec function that
is nil because letrec bindings are in VM local SLOTS, not in the CEK env.
The VM→CEK boundary crossing during suspension loses the local slot values.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
bootstrap.py regenerated cek_run as a simple "raise if suspended" without
the _cek_io_resolver and _cek_io_suspend_hook checks. Also lost the
CekPerformRequest catch in cek_step_loop and step_limit checks.
This was the direct cause of "IO suspension in non-IO context" when island
click handlers called perform (via hs-wait). The CEK had no way to propagate
the suspension to the VM/JS boundary.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Root cause: when perform fires inside a VM closure chain (call_closure_reuse),
the caller frames are saved to reuse_stack on the ACTIVE VM. But the
_cek_io_suspend_hook and _cek_eval_lambda_ref create a NEW stub VM for the
VmSuspended exception. On resume, resume_vm runs on the STUB VM which has
an empty reuse_stack — the caller frames are orphaned on the original VM.
Fix: transfer reuse_stack from _active_vm to the stub VM before raising
VmSuspended. This ensures resume_vm -> restore_reuse can find and restore
the caller's frames after async resume via _driveAsync/setTimeout.
Also restore step_limit/step_count refs dropped by bootstrap.py regeneration.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Root cause: sx_browser.ml registered all HTML tags (a, b, i, p, s, u, g, etc.)
as custom special forms. The evaluator's step_eval_list checked custom special
forms BEFORE checking local env bindings. So (let ((a (fn () 42))) (a))
matched the HTML tag <a> instead of calling the local function a.
Fix: skip custom special forms AND render-check when the symbol is bound in
the local env. Added (not (env-has? env name)) guard to both checks in
step-eval-list (spec/evaluator.sx and transpiled sx_ref.ml).
This was the root cause of "[sx] resume: Not callable: nil" — after hs-wait
resumed, calling letrec-bound functions like wait-boot (which is not an HTML
tag) worked, but any function whose name collided with an HTML tag failed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The previous commit accidentally lost ~1100 lines from sx_server.ml
due to a git stash conflict resolution that silently deleted the
hash-index, manifest generation, and /sx/h/ route handler code.
Restored from 97818c6d. Only change: added host-* platform primitive
stubs (host-get, host-set!, host-call, etc.) needed because the
callable? fix in boot-helpers.sx now properly loads code paths that
reference these browser-only functions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
callable? in boot-helpers.sx checked for "native-fn" but type-of returns
"function" for NativeFn — broke make-spread and all native fn dispatch
in aser. Restore 20 behavioral tests replaced with NOT IMPLEMENTED stubs
by the test regeneration commit. Add host-* platform primitive stubs to
sx_server.ml so boot-helpers.sx loads without errors server-side.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The _cek_io_suspend_hook creates a stub VM to carry the suspended CEK
state. Previously used empty globals, which caused "Not callable: nil"
when the CEK resume needed platform functions. Now uses _default_vm_globals
(set to _vm_globals by sx_browser.ml) so all platform functions and
definitions are available during resume.
Remaining issue: still getting "resume: Not callable: nil" — the CEK
continuation env may not include letrec bindings from the island body.
The suspension point is inside reload-frame → hs-wait, and the resume
needs to call wait-boot (a letrec binding).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The _cek_io_suspend_hook was only added to cek_run_iterative (line 986)
but the actual code path went through cek_run (line 624). Added the hook
check to both functions.
This fixes the "IO suspension in non-IO context" error that blocked
hs-wait/perform from propagating through event handler → trampoline →
eval_expr call chains. IO suspension now converts to VmSuspended via the
hook, which the value_to_js wrapper catches and drives with _driveAsync.
+42 OCaml test passes (3924→3966). IO suspension verified working in
browser WASM: dom-on click handler → hs-wait → perform → suspend →
_driveAsync → setTimeout → resume.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Root cause: cek_run_iterative (used by eval_expr/trampoline) raised
"IO suspension in non-IO context" when the CEK hit a perform. This
blocked IO suspension from propagating through nested eval_expr calls
(event handler → trampoline → eval_expr → for-each callback → hs-wait).
Fix: added _cek_io_suspend_hook (Sx_types) that converts CEK suspension
to VmSuspended, set by sx_vm.ml at init. cek_run_iterative now calls the
hook instead of erroring. The VmSuspended propagates to the value_to_js
wrapper which has _driveAsync handling.
+42 test passes (3924→3966), zero regressions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Root cause found: when the click handler calls run-all → for-each → callback → hs-wait → perform,
the perform raises VmSuspended. But the call path goes through sx_apply_cek
(from the call-lambda CALL_PRIM) which converts VmSuspended → CekPerformRequest.
The inner CEK context has no IO handler, so it raises "IO suspension in non-IO context"
instead of propagating the suspension to the outer context.
Fix needed: either (a) make sx_apply_cek NOT convert VmSuspended when in a context
that supports IO suspension, or (b) ensure the inner CEK from call-lambda propagates
perform as a suspension state rather than erroring.
Debug logging still present in sx_browser.ml (js_to_value traces).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
runner.sx: Converted define forms inside island body to letrec. Multiple
define forms in a let body cause render-to-dom to fall back to eval-expr
for the whole body, which evaluates (div ...) as a list instead of
rendering it to DOM. letrec keeps the last body expression (div) as the
render target.
sx_browser.ml: js_to_value now stores plain JS functions as host objects
(Dict with __host_handle) instead of wrapping as NativeFn. This preserves
the original JS function identity through the SX→JS round-trip, keeping
_driveAsync wrappers from host-callback intact when passed to
addEventListener via host-call.
Remaining: IO suspension in click handler is caught as "IO suspension in
non-IO context" instead of being driven by _driveAsync. The host-callback
wrapper creates the right JS function, but the event dispatch path doesn't
go through K.callFn.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
VM frame merging bug: call_closure_reuse now saves caller continuations
on a reuse_stack instead of merging frames. resume_vm restores them in
innermost-first order. Fixes frame count corruption when nested closures
suspend via OP_PERFORM. Zero test regressions (3924/3924).
Island hydration: hydrate-island now looks up components from (global-env)
instead of render-env, triggering the symbol resolve hook. Added JS-level
preload-island-defs that scans DOM for data-sx-island and loads definitions
from the content-addressed manifest BEFORE hydration — avoids K.load
reentrancy when the resolve hook fires inside env_get.
loadDefinitionByHash: fixed isMultiDefine check — defcomp/defisland bodies
containing nested (define ...) forms no longer suppress name insertion.
Added K.load return value checking for silent error string returns.
sx_browser.ml: resolve hook falls back to global_env.bindings when
_vm_globals miss (sync gap). Snapshot reuse_stack alongside pending_cek.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- htmx-boot-subtree! wired into process-elements for auto-activation
- Fixed cond compilation bug in hx-verb-info (Clojure-style flat cond)
- Platform io-fetch upgraded: method/body/headers support, full response dict
- Replaced perform IO ops with browser primitives (set-timeout, browser-confirm, etc)
- SX→HTML rendering in hx-do-swap with OOB section filtering
- hx-collect-params: collects input name/value for all methods
- Handler naming: ex-{slug} convention, removed perform IO dependencies
- Test runner page at (test.(applications.(htmx))) with iframe-based runner
- Header "test" link on every page linking to test URL
- Page file restructure: 285 files moved to URL-matching paths (a/b/c/index.sx)
- page-functions.sx: ~100 component name references updated
- _test added to skip_dirs, test- file prefix convention for test files
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- sx_vm.ml: VM timeout now compares vm_insn_count > step_limit instead of
unconditionally throwing after 65536 instructions when limit > 0
- sx_browser.ml: Expose setStepLimit/resetStepCount APIs on SxKernel;
callFn now returns {__sx_error, message} on Eval_error instead of null
- compiler.sx: emit-set handles array-index targets (host-set! instead of
nth) and 'of' property chains (dom-set-prop with chain navigation)
- hs-run-fast.js: New Node.js test runner with step-limit timeouts,
SX-level guard for error detection, insertAdjacentHTML mock,
range selection (HS_START/HS_END), wall-clock timeout in driveAsync
- hs-debug-test.js: Single-test debugger with DOM state inspection
- hs-verify.js: Assertion verification (proves pass/fail detection works)
Test results: 415/831 (50%), up from 408/831 (49%) baseline.
Fixes: set my style["color"], set X of Y, put at end of (insertAdjacentHTML).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When innerHTML is set on a mock element, textContent now updates to
match (with HTML tags stripped). Many HS tests do `put "foo" into me`
(which sets innerHTML) then check textContent. Previously textContent
stayed empty because only innerHTML was updated.
Also fixes innerHTML="" to fully detach children from parent.
393 → 408/831 HS tests (+15).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Setting innerHTML="" on a mock element now detaches and removes all
children, matching browser behavior. Previously hs-cleanup! (which
sets body.innerHTML="") left stale children attached, causing
querySelector to find elements from prior tests.
Also clears children when textContent is set (browser behavior).
375 → 393/831 HS tests (+18).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
In a real browser, innerHTML/textContent/value are always strings.
The mock was storing raw SX values (Number, Bool, Nil), causing type
mismatches like "Expected 1, got 1" where the value was correct but
Number 1.0 != String "1".
Now coerces to string on host-set! for innerHTML, textContent, value,
outerHTML, innerText. Fixes 10 increment tests that were doing
`put value into me` with numeric results.
367 → 375/831 HS tests (+8 net, +10 new passes, -2 regressions).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The infinite loops in the HS parser are in transpiled native OCaml code,
not in the VM or CEK step loop. Neither step counters (in cek_step_loop,
cek_step, trampoline) nor VM instruction checks caught them because
the loops are in direct OCaml recursion.
Fix: SIGALRM handler raises Eval_error to break out of native loops.
Also sets step_limit flag to catch VM loops. Combined approach handles
both native OCaml recursion (alarm+raise) and VM bytecode (step check).
The alarm+raise can become unreliable after ~13 timeouts in a single
process, but handles the common case well. Reverts the fork-based
approach which lost inter-test state.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Two critical fixes for the mock DOM test runner:
1. host-get returns truthy for DOM method names on mock elements.
dom.sx guards like `(and el (host-get el "setAttribute"))` were
silently skipping setAttribute/getAttribute calls because the mock
dict had no "setAttribute" key. Now returns Bool true for known
DOM method names, fixing hs-activate! → dom-set-attr → dom-get-attr
chain. Also adds firstElementChild, nextElementSibling, etc. as
computed properties.
2. Fork-based per-test timeout (5 seconds). The HS parser has infinite
loops on certain syntax ([@attr], complex put targets). Signal-based
alarm doesn't work reliably in OCaml 5. Fork + waitpid + select
gives hard OS-level timeout protection.
Also adds step_limit/step_count to sx_ref.ml trampoline (currently
unused but available for future CEK-level timeout).
Result: 525/963 total, up from 498. Many more add/remove/toggle/set
tests now pass because hs-activate! actually wires up event handlers.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
