Update __init__.py

Author: StunxFS

rivetc/src/codegen/__init__.py

@@ -278,6 +278,7 @@ def gen_source_files(self, source_files):
             if self.comp.prefs.build_mode == prefs.BuildMode.Test:
                 exit_code = os.system(self.comp.prefs.mod_output)
                 os.remove(self.comp.prefs.mod_output)
+                print("exit code:", exit_code)
                 if exit_code != 0:
                     exit(exit_code)