Remove empty code.h file

src/runtime/types.cpp

@@ -35,7 +35,6 @@
 #include "core/stats.h"
 #include "core/types.h"
 #include "runtime/classobj.h"
-#include "runtime/code.h"
 #include "runtime/complex.h"
 #include "runtime/dict.h"
 #include "runtime/hiddenclass.h"

tools/lint.py

@@ -25,6 +25,7 @@ def verify_include_guard(_, dir, files):
         with open(fn) as f:
             while True:
                 l = f.readline()
+                assert l, "Did not find include guard in " + fn
                 if l.startswith('//') or not l.strip():
                     continue
                 break