error: C function 'c_abs_one' not visible; add #import for the module that declares it
  --> examples/1228-ffi-extern-c-non-transitive.sx:11:19
   |
11 |     print("{}\n", c_abs_one(-3));
   |                   ^^^^^^^^^

error: C function 'c_abs_two' not visible; add #import for the module that declares it
  --> examples/1228-ffi-extern-c-non-transitive.sx:12:19
   |
12 |     print("{}\n", c_abs_two(-4));
   |                   ^^^^^^^^^
