ludic/examples/events/answer.ludic
Orkuncakilkaya f5ab5cf88a fix(events): a listener's return ends that listener, not the dispatch
Listeners are compiled into one @ev_<E> function and return branched to its exit, so every
listener declared after one that returned early - and every foreign listener - never heard
the event. The per-kind listener shape (return unless it is my kind) answered only the
first-declared kind. examples/events/answer.ludic holds it; seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-23 17:42:18 +03:00

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# answer.ludic — one listener per kind: each answers only for its own and returns early for
# every other. A `return` ends that listener, never the dispatch, so the listener for kind 2
# still hears the event after the one for kind 1 has returned.
#
# Running it prints: 10 20 0
program Answer {
event cancellable Ask { kind: int }
var answer: int = 0
@On(Ask) handler One { if kind != 1 { return }; answer = 10; cancel }
@On(Ask) handler Two { if kind != 2 { return }; answer = 20; cancel }
function ask(k: int) -> int {
answer = 0
if emit Ask(kind: k) != 0 { return answer }
return 0
}
entry {
print(ask(1))
print(ask(2))
print(ask(3))
}
}