Stream B1 B1.2 (Io capability + context.io + Future + cancel) is blocked on
two newly-discovered, independent compiler bugs, both with standalone repros:
- 0150: a `void` struct field crashes the compiler with an unsized-type
SIGTRAP in LLVM getTypeSizeInBits. Blocks `Future(void)` -> `timeout`.
- 0151: a type-var inferred from a fn-pointer parameter's RETURN type is not
bound as a usable type in the function body (`unknown type 'R'`). Blocks the
central `async(io, worker: ($A)->$R, arg)` free-fn's `Future(R)`.
The B1.2 design itself is validated end-to-end (the Io protocol threaded on
Context like Allocator, the stateless blocking CBlockingIo default, both
__sx_default_context materializers, and `context.io.now_ms()` all work live).
Only the async/await/timeout ergonomic layer hits the two bugs. Per the
IMPASSABLE STOP rule, all B1.2 working changes were reverted (master green,
726/0) and the work paused pending fixes; WIP is saved at .sx-tmp/b12-wip/.
Checkpoint + plan updated to mark B1.2 BLOCKED with full resume notes.
e78320637f