sx/issues/0019-import-non-transitive-c-scope.md

0019 — #import is non-transitive (C-function scope across files)

RESOLVED. The .md's own repro is non-runnable (relative ../modules/std.sx imports) and superseded; the scenario — A importing B does NOT transitively expose a third module's top-level names — is enforced by the non-transitive #import visibility check in lowerCall (src/ir/lower/call.zig:106-118, gated on isNameVisible, defined in src/ir/lower/decl.zig:2502), with the const-reference path mirrored in src/ir/lower/expr.zig. Covered by the passing regression test examples/0706-modules-import-non-transitive.sx.

Status: superseded — kept for reference. Relocated from the old examples/issue-0019/ fixture during the test-layout migration. The behavior it probed (A imports B and C; C must NOT see B's extern C functions just because A imported B) is now covered by the passing test examples/0706-modules-import-non-transitive.sx.

What it probed

main imports both c_wrapper.sx (which declares C extern functions) and other.sx. other.sx should not gain access to c_wrapper's C functions transitively — using one should produce the "not visible; #import the module that declares it" diagnostic.

• main_good.sx — the valid arrangement.
• main_bad.sx — the arrangement that must be rejected.
• c_wrapper.sx, other.sx — the imported modules.

Caveat (why it doesn't run as-is)

The fixture uses relative imports (#import "../modules/std.sx"), which only resolve relative to a specific working directory and violate the project's "always package:/module-path imports, never relative" rule. It is not runnable from the repo root and is not wired into the suite. If revived, rewrite the imports to the standard modules/... form and pin expected output; otherwise it can be deleted (the scenario is already covered by 0706-modules-import-non-transitive).