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test(ffi-linkage): Phase 5.0 prereq — xfail extern same-name authors wrongly ambiguous

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Two flat imports each declare `absval` via `extern libc "abs"` (the
`extern` twin of example 0729's `#foreign` form). Like its #foreign twin,
this must compile + run (prints 7), not error as an ambiguous bare-call
collision.

Today `isPlainFreeFn` / `isPlainFreeFnDecl` exclude a `#foreign` body but
classify an empty-block `extern` fn as a plain free function, so the two
extern authors ARE counted in the bare-call ambiguity verdict and the call
errors. A third extern/#foreign divergence (after visibility + variadic)
and a prerequisite for migrating the fn-decl `#foreign` path onto `extern`.

646 corpus (1230 xfail), 444 unit.
This commit is contained in:
agra
2026-06-15 03:43:18 +03:00
parent b5411efeb8
commit 270652186e
6 changed files with 32 additions and 0 deletions
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6
examples/1230-ffi-extern-same-name-authors/a.sx Normal file
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// One of two flat authors of `absval`, an `extern` libc binding — the
// `extern` twin of example 0729's `#foreign libc "abs"`. A consumer
// flat-importing BOTH must NOT see this as an ambiguous bare-call
// collision: extern authors (external C symbols) are excluded from the
// bare-call ambiguity verdict, exactly like their `#foreign` twins.
absval :: (n: i32) -> i32 extern libc "abs";

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examples/1230-ffi-extern-same-name-authors/b.sx Normal file
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// The second flat author of `absval` — the identical `extern` binding.
absval :: (n: i32) -> i32 extern libc "abs";