CONC020

CONC020 — tell on a reply-bearing handler

Subsystem	Concurrency
Severity	error

c.tell(Msg) is fire-and-forget, but Msg’s handler declares a reply (handle Msg -> T). Use c.ask(Msg) to receive the Future<T>. See spec/concurrency.md §“tell vs ask”.

From your terminal:

q64 explain CONC020