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ww/test/wcc/data/wwispread/main.ww
Hojun-Cho 24ca570a7e w6c,ww: re-emit ... union-spread marker in .wwi producer (M4 E3, #95)
The N_TTAGGED serializer emitted each variant via wwi_type but never
re-emitted the `...` prefix for TK_ELLIPSIS spread variants, so an
exported `(...inner | str)` round-tripped through .wwi as `(inner | str)`.
The consumer's checker then could not flatten inner's members into the
alias and variadic-assignability rejected bare members — under separate
compilation this broke fmt/log/getopt. Re-emit `...` before the variant
type, both stages; the producer stays purely syntactic (flatten/dedup
remain the consumer's type-store job, per ref/hare/hare/unparse/type.ha:290-300).

Gate: test/wcc/989_wwispread_sep.c — table-driven (2-arm + 3-arm spreads)
x both stages, asserts the marker survives the .wwi, the consumer binds
bare members under --sep (exit 0), and cs==ww .wwi byte-identity.
2026-06-18 09:52:19 +09:00

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package main;
import liba;
// Each assignment binds a BARE member of inner (i32, i64) or the outer-direct
// arm (str) to liba.outer — typechecks ONLY if the spread flattened inner's
// arms into outer across the liba.wwi round-trip (#95).
export fn main() void = {
let x: liba.outer = 42i32;
x = 99i64;
x = "hi";
return;
};