2d34993586
resolveForwardIdentifierAliases now resolves a forward alias A :: B against B AS SEEN FROM A's own source via selectNominalLeaf (E1's source-keyed nominal leaf over type_aliases_by_source / moduleTypeAuthor), never the global type_alias_map / global findByName. The already-resolved guard is per-source (aliasResolvedInSource). .pending routes back into the fixpoint; .undeclared / .not_visible leave A unwritten (no global last-wins leak). This is the sequencing pin before E2: a global fixpoint binds A to a same-name B authored by a different module (e.g. a namespaced import that pollutes the global alias map last-wins), re-opening 0105 one layer down once shadows register. Writes stay on the unified putTypeAlias helper (E1 no-drift invariant); the single graph-walk in resolver.zig is untouched. Regression: examples/0750-modules-forward-alias-source-aware — a forward alias A :: B with main's own B :: u64 and a namespaced same-name B :: u8; A must bind main's u64 (300), not the global last-wins u8 (44).
32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
// Source-aware forward-alias fixpoint (R5 §4, E1.5). A forward identifier alias
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// `A :: B` must resolve its target `B` AS SEEN FROM ITS OWN SOURCE, not via the
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// global `type_alias_map` (which is last-wins across every module).
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//
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// `main` authors a forward alias `A :: B` and its own `B :: u64`. The namespaced
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// import `ns :: #import ".../dep.sx"` ALSO authors a top-level `B :: u8`; being
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// scanned after main's `B`, dep's alias is what the GLOBAL `type_alias_map["B"]`
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// ends up holding (last-wins). A global forward-alias fixpoint therefore bound
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// `A` to dep's `u8` — re-opening 0105 one layer down. The source-aware fixpoint
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// resolves `A`'s target against MAIN's source, binding the local `B :: u64`.
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//
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// Observable: a runtime 300 coerced into an `A`-typed slot round-trips as 300
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// when `A` is `u64` (correct) and truncates to 44 when `A` is wrongly `u8`.
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// The direct reference `b : B` already resolves source-aware via E1's nominal
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// leaf, so it pins the same `u64` for contrast. Regression (stdlib E1.5).
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#import "modules/std.sx";
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A :: B;
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B :: u64;
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ns :: #import "0750-modules-forward-alias-source-aware/dep.sx";
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main :: () -> s32 {
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n : s64 = 300;
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a : A = xx n;
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b : B = xx n;
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print("forward A (u64=300): {}\n", cast(s64) a);
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print("direct B (u64=300): {}\n", cast(s64) b);
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print("ns.width(): {}\n", ns.width());
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return 0;
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}
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