error: C function 'c_foreign_abs' not visible; add #import for the module that declares it
  --> examples/1228-ffi-extern-c-non-transitive.sx:16:19
   |
16 |     print("{}\n", c_foreign_abs(-3));
   |                   ^^^^^^^^^^^^^

error: C function 'c_extern_abs' not visible; add #import for the module that declares it
  --> examples/1228-ffi-extern-c-non-transitive.sx:17:19
   |
17 |     print("{}\n", c_extern_abs(-4));
   |                   ^^^^^^^^^^^^