test.diff

diff --git a/ceval.c b/ceval.c
index 06ada97..27a929b 100644
--- a/ceval.c
+++ b/ceval.c
@@ -4781,6 +4781,7 @@ static PyObject *
 string_concatenate(PyObject *v, PyObject *w,
                    PyFrameObject *f, unsigned char *next_instr)
 {
+    printf("\ncalling string_concatenate\n");
     /* This function implements 'variable += expr' when both arguments
        are strings. */
     Py_ssize_t v_len = PyString_GET_SIZE(v);
@@ -4853,6 +4854,7 @@ string_concatenate(PyObject *v, PyObject *w,
     }
     else {
         /* When in-place resizing is not an option. */
+        printf("no place for resizing, will call string_concat\n");
         PyString_Concat(&v, w);
         return v;
     }