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test(ffi-linkage): Phase 5.0 prereq — xfail lib-less extern/#foreign C-import visibility equivalence

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Cross-module example (main → b → c) referencing c's lib-less C imports
transitively. The non-transitive C-import gate (lower/decl.zig
c_import_bare) must police the legacy `#foreign` form and the new
`extern` keyword IDENTICALLY — same 'C function not visible' diagnostic,
not the generic top-level-name wording. Today the extern twin escapes the
c_import_bare gate (body is an empty block, not foreign_expr) and is only
caught by the general isNameVisible gate, yielding the generic message.
Expected snapshot pins the DESIRED equivalent wording; the next commit
aligns the gate to green it. Prerequisite for migrating the fn-decl
`#foreign` path onto `extern`.

443/444 corpus (1228 xfail), 444 unit.
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2026-06-14 20:47:48 +03:00
parent 47aaf3662a
commit 717c35d26d
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