Hojun-Cho
34c1051a63
A second top-level decl named `main` (fn/let/def/type) collides with the entry main on the single bare `main` symbol: today both lower to a bare `main`, w6l silently accepts the duplicate, and the program links rc=0 then segfaults (or runs wrong), in both stages. The existing duplicate-decl rejects key on (name, module), so a cross-module `foo.main` vs the bare entry `main` read as distinct and slip through. Add a program-global, name-only, cross-module uniqueness check on `main` in the checker (both stages), colocated with the duplicate-decl rejects and counting user decls before the -T synthesized test main. Corpus-safe: a lone `fn main` in any package stays legal (ww has no package-main convention -- cmatrix/lisp/mandelbrot are non-main-package entries and keep building). This converts the silent segfault to a loud compile error and subsumes the w6l silent-dup-main case (#31); correct package-aware mangling of a non-entry main is deferred to the root-unit entry-detection work (#22/#32). Regenerates the w6c and wwdump combined.ww. Table-driven 842 test: reject rows for let/fn/def/type main (genuine cross-module import form) plus a negative single-main corpus-safe row that must still build+run.