Hojun-Cho d9041ab45e os: graduate tryopen/trywrite/tryread to (T | oserror) ...

Final piece of the os module graduation: the three try* wrappers
move off the (T | str) placeholder shape. `oserror` becomes a real
Hare-style error type (`!i64` instead of plain `i64`), so it's
picked up by ?-propagation as the error half without callers having
to name it.

tryread:  (i64 | oserror)   was (i64 | str)
trywrite: (i64 | oserror)   was (i64 | str)
tryopen:  (i32 | oserror)   was (i32 | str)

Callsites updated: wwdump uses tryopen; the e2e trywrite probe
matches on os.oserror and validates -EBADF for a bad fd (-9 instead
of the old "write failed" string length).

selfhost/test/smoke.ww switched to raw os.open(2) instead of
os.tryopen for probe 7 — same reason as the os.readall switch in
the prior commit: probe 6 in 990_selfhost compiles smoke.ww
standalone, and cross-module type refs like `os.oserror` don't
resolve in that mode.

2026-05-12 02:42:49 +09:00

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