def say_hi():
 print( 'hello world'[3:6])
==>
 File "./rusthon.py", line 539, in build
 pak = translate_to_cpp( pyjs, cached_json_files=cached_json ) ## pak contains: c_header and cpp_header
 File "<string>", line 13898, in translate_to_cpp
 File "<string>", line 1244, in visit
 File "<string>", line 13547, in visit_Module
 File "<string>", line 1244, in visit
 File "<string>", line 6341, in visit_FunctionDef
 File "<string>", line 12084, in _visit_function
 File "<string>", line 12212, in generate_generic_branches
 File "<string>", line 1244, in visit
 File "<string>", line 13723, in visit_Print
 File "<string>", line 1244, in visit
 File "<string>", line 10764, in visit_Subscript
__main__.GenerateSlice: {'upper': '6', 'lower': '3', 'slice': <_ast.Slice object at 0x102deabd0>, 'step': None, 'value': 'std::string("hello world")'}