Slicing family in lib/erlang/lists-ext.sx. sublist lenient; nthtail
and split strict (badarg when list shorter than N); droplast raises
on []. lists_ext suite 70 -> 83.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Zip family in lib/erlang/lists-ext.sx; length mismatch and malformed
pairs raise badarg. lists_ext suite 62 -> 70.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Structural/aggregate ops in lib/erlang/lists-ext.sx: flatten/1 deep
flatten, max/1 and min/1 by full Erlang term order (badarg on empty).
Extreme-finder uses er-ext-lt?'s SX boolean directly in if (er-truthy?
only recognises Erlang bool atoms). lists_ext suite 52 -> 62.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Higher-order traversal family in lib/erlang/lists-ext.sx, registered
pure via the er-register-builtin-bifs! wrapper. foldr right-folds;
partition returns {Yes,No} order-preserved; splitwith = {takewhile,
dropwhile}. lists_ext suite 38 -> 52.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds the tuple-keyed list family to lib/erlang/lists-ext.sx: act on
first match, key compare via == (er-equal?), non-tuples/short tuples
pass through. keysort/2 reuses the stable merge sort + full term
order. keytake/3 returns {value, Tuple, Rest} | false. All seven
registered through the er-register-builtin-bifs! wrapper so they
survive mid-run registry resets. lists_ext suite 17 -> 38.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
New lib/erlang/lists-ext.sx (loaded after runtime.sx): stable merge
sort over an SX-list bridge. sort/1 and usort/1 use full Erlang term
order via a self-contained er-ext-lt? (deep tuple/list compare that
the shared er-lt? lacks); sort/2 takes a fun(A,B)->bool comparator.
Registration wraps er-register-builtin-bifs! so the BIFs survive the
mid-run registry resets done by tests/runtime.sx.
Roadmap is saturated within this loop's scope; this is forever-loop
stdlib hardening. New file forced by the broken sx-tree write tools
in this worktree (see Blockers) — authored via Write + sx_validate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
T5 — send_after addresses a registered atom name; the delayed message
lands in that process's mailbox (destination resolved at fire time,
dead/unregistered targets drop silently).
T6 — gen_server loop now handles the {reply,R,S,T} / {noreply,S,T}
timeout-bearing callback returns by scheduling {timeout} to itself via
send_after; handle_info({timeout}, S) fires when no other message
arrives first. Sanity-checks the library hookup.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
T3 — concurrent timers fire in deadline order, not schedule order
(scheduler jumps the clock to the earliest pending deadline each
time the runnable queue drains). T4 — cancel_timer on an
already-fired timer returns the atom false.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Logical-clock timer wheel in the scheduler. send_after schedules a
message-delivery event at an absolute deadline (clock + Time ms);
cancel_timer marks a live timer cancelled and reports remaining ms,
or false. Time advances only when the runnable queue drains, jumping
to the earliest pending deadline (deterministic, no wall clock).
monotonic_time/0,1 exposes the logical ms clock.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
