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messagix/bloks: support bk.action.core.Let#264

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g/plat-36280
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messagix/bloks: support bk.action.core.Let#264
iFixRobots wants to merge 1 commit intomainfrom
g/plat-36280

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@iFixRobots iFixRobots commented May 5, 2026

Adds the missing bk.action.core.Let opcode. Without it, the Messenger Lite login flow fails on the email/password screen with tapping login button: on_touch_down: unimplemented function bk.action.core.Let (2 args) — Facebook's login script started using Let to lazy-init per-screen animation state.

Let(currentOrNull, FuncConst(initializer)): if currentOrNull evaluates to a non-null value (a previously cached value), return it; otherwise apply the FuncConst lambda in arg 1 and return its result. Implementation matches the existing Coalesce pattern plus the Apply lambda invocation.

Reproduced and verified against a real captured bundle: the on_touch_down handler now executes through to com.bloks.www.bloks.caa.login.async.send_login_request cleanly via pkg/messagix/bloks/cmd -file <bundle> -action -login.

Closes PLAT-36280.

@iFixRobots iFixRobots requested review from radon-at-beeper and tulir and removed request for radon-at-beeper May 5, 2026 23:08
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