// Two spellings of the same lib-less C-symbol import: the legacy
// `#foreign` form and the new `extern` keyword. Both declare a C
// function resolved at link time with no library reference. The
// FFI-linkage migration (Part B) requires the two to be policed
// IDENTICALLY by the non-transitive C-import visibility gate.
c_foreign_abs :: (x: i32) -> i32 #foreign;
c_extern_abs  :: (x: i32) -> i32 extern;