The normal SWIG warning system has not been used (there are no warning numbers, you could call Swig_warning), eg:
Warning: invalid MATLAB symbol 'FooImpl' ()
Symbols may not start with ''. Maybe try something like this: %rename(u_FooImpl) _FooImpl;
warning: function ./+enum_thorough/end.m shadows a built-in function
Comment by @wsfulton: