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sx/examples/0768-modules-own-wins-nonleaf-bare-type.sx
agra cb9ef381b5 fix(stdlib/E4): own-wins at non-leaf bare-type sites + type-fn head ambiguity
attempt-6: address Adi's two in-scope findings (#3 deferred to E6).

#1 E4-own-author-type-arg (silent-wrong): the bare-TYPE gate returned
`.proceed` for the querying source's OWN author, so the non-leaf sites
(reflection / type-arg / array-literal / type-value / match arm) dropped it
and re-resolved a same-name flat import via global `findByName`. headTypeGate
now resolves the own author to ITS per-source TypeId (mirroring
selectNominalLeaf's own-wins, 0754); the type-as-value and type-match sites,
which only consumed the poison bit and re-resolved globally, now route through
the gate and use the `.resolved` author. size_of(Widget) with an own + imported
Widget now yields main's own size, not the import's.

#2 E4-type-fn-head-ambiguity (silent-wrong): headFnLeak only checked
isNameVisible, so two flat same-name type-returning functions both reported
"visible" and one was silently instantiated. It now diagnoses >=2 distinct
direct flat type-fn authors (no own author) as ambiguous before the
isNameVisible short-circuit, consistent with the parameterized struct /
protocol heads and the leaf (0755/0767). Own / single / diamond-collapse
type-fn heads still resolve.

Regressions: 0768 (own-wins at every non-leaf bare-type site, fail-before
reflection=16 -> pass-after 8) and 0769 (two flat Make type-fns -> ambiguity
diagnostic exit 1). README: own-wins + type-fn-head ambiguity at every bare-type
site.
2026-06-08 15:22:10 +03:00

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// Own-wins (0754 / issue 0105 case 3) holds at EVERY non-leaf bare-type site,
// not just the nominal leaf annotation. `main` flat-imports `dep.sx` (which
// authors a same-name `Widget { a, b }` = 16 bytes and `Nums :: [2]s32` = 8
// bytes) AND authors its OWN `Widget { a }` = 8 bytes and `Nums :: [2]s64` = 16
// bytes. Each bare reference below must resolve to MAIN's own author — the gate's
// source-keyed `.resolved` author — NOT whichever same-name flat import a global
// `findByName` / `struct_template_map` pick would return:
//
// - reflection / type-arg slot `size_of(Widget)` → 8 (own)
// - typed array-literal head `Nums.[…]` / size_of → 16 (own [2]s64)
// - type-as-value `t : Type = Widget`
// - type-category match arm `case Widget:` → own identity
//
// Regression (Phase E4 attempt-6, finding #1): before the bare-type gate carried
// the OWN author's source-keyed TypeId into the non-leaf sites, an own author
// produced `.proceed` and these sites fell through to a global `findByName` — so
// `size_of(Widget)` printed the IMPORTED type's 16 and `case Widget:` matched the
// imported nominal identity (describe → 222). `dep_sizes` proves dep's distinct
// types still resolve to THEIR own 16 + 8 = 24 inside dep.
#import "modules/std.sx";
#import "0768-modules-own-wins-nonleaf-bare-type/dep.sx";
Widget :: struct { a: s64; }
Nums :: [2]s64;
describe :: ($T: Type) -> s32 {
r := if T == {
case Widget: 111;
else: 222;
}
r
}
main :: () -> s32 {
print("reflection={}\n", size_of(Widget));
xs := Nums.[1, 2];
print("array={}\n", size_of(Nums));
t : Type = Widget;
print("typeval_eq={}\n", t == Widget);
print("match={}\n", describe(Widget));
print("dep={}\n", dep_sizes());
0
}