Hojun-Cho ea1579a6fd wcc: exprtype resolves SK_USE module-qual N_DOT call results (#16, #17) ...

Re-arming the wwstage asserttyped bail surfaced 94 nil-stamp warns in the
checked corpus: let (a,b) = mod.fn() left its destructure bindings (and every
use) unstamped because exprtype's N_CALL arm resolved an N_DOT callee by bare
leaf — the gap its own comment flagged (#16/#17). Fix at the root: when an
N_DOT callee's lhs resolves to SK_USE, resolve the result via
scopelookupinmodule (mirror cstage cexpr check.c:1035 + cgen fnretlookupmod
cgen.ww:2263). The N_MLET backfill then just consumes the resolved tuple,
matching harec create_unpack_bindings (check.c:1354-1419), which does no callee
resolution — single path, no third copy.

The SK_USE gate leaves the module-leaf==type/fn-name collision cases
(random/fnmatch) on bare lookup — that nominal-resolution gap is a separate
fold. Beyond destructure, the root fix also closes a latent cs!=ww divergence
on non-destructure cross-module same-leaf calls (a head-ordered shadow was
mis-sizing the receive slot).

asserttyped is ww-stage only, so the live ww-driver suite can't see this — the
net is the warn count (checked 94->0, collision cases unchanged) + cs==ww .s
(probe 956). Compiler binary unchanged; 990-997 byte-id hold.

2026-05-28 03:55:22 +09:00

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