270652186e
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.
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