Hojun-Cho
884dbb402b
The wwstage checker resolved a module-qualified call/access mod.x by the same-module preference in scopelookupprefer, so when the importing package's name collides with a type/fn of the same leaf (package fnmatch with fn fnmatch; package random with type random), the dot-lhs mod resolved to the same-leaf SK_TYPE/SK_FN instead of the coexisting SK_USE import — the N_DOT module-qual arm never fired and the call went nil-stamped (the D class of the asserttyped gap audit: fnmatch 2, random 16). cstage resolves this via Sym.use_alias; this ports the equivalent to wwstage. Add scopelookupuselocal (a single-scope SK_USE lookup, twin of scopelookuptype) and prefer SK_USE for a dot-lhs in exprtype's N_CALL and N_DOT arms, keyed on the scope where scopelookupprefer landed so a local binding sharing a module's leaf keeps value semantics. Scope-layer only — no type-identity touch (cstage use_alias never reaches type_eq). Drives the 901 gap-corpus D count to 0 (random_test now byte-id cs==ww). Compiler binary unchanged (no such collision in its own source); 990-997 hold. The separate fnmatch bare-enum-member cgen cs!=ww is unrelated (filed).