ScriptTimeoutError

Thrown by the timeout guard ScriptWeave.instrument inlines into a script's own bytecode when a tick's shared script-time budget is exhausted. An Error rather than an Exception so a script's catch (e: Exception) cannot swallow it.

ONE instance serves the whole process (TimeoutGuard.timeout): the throw is a bare GETSTATIC + ATHROW, because a NEW needs an INVOKESPECIAL <init> — the stack frame the stack-full edge doesn't have. A shared throwable has to be immutable, so the flags below null out all three of Throwable's writable fields: one eval can't poison every later one through addSuppressed (a list with no clearing API, re-rendered by every later report, pinning the snippet loader that threw) or through initCause (one-shot while cause == this), and skipping fillInStackTrace keeps a throw O(1) — otherwise unwinding deep recursion walks the stack on every re-throw, making the whole unwind O(depth²).

It therefore carries no stack and cannot be given one: setStackTrace is a no-op here too. Where the lane was when the budget ran out belongs to the lane thread — several evals share one budget — so it has to reach the report by a side channel rather than be written onto this value.