Trace 0:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() succeeds (Py_DECREF() without deallocation on *LHS) (Py_DECREF() without deallocation on RHS)'
    'returning'
  Return value:
    repr(): PointerToRegion(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)))
    str(): (struct PyObject *)&RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
    r->ob_refcnt: refs: 1 owned
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=Region('PyTypeObject for result of PyString_Concat'))
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 1:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() succeeds (Py_DECREF() without deallocation on *LHS) (Py_DECREF() with deallocation on RHS)'
    'returning'
  Return value:
    repr(): PointerToRegion(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)))
    str(): (struct PyObject *)&RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
    r->ob_refcnt: refs: 1 owned
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=Region('PyTypeObject for result of PyString_Concat'))
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 2:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() succeeds (Py_DECREF() with deallocation on *LHS) (Py_DECREF() without deallocation on RHS)'
    'returning'
  Return value:
    repr(): PointerToRegion(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)))
    str(): (struct PyObject *)&RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
    r->ob_refcnt: refs: 1 owned
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=Region('PyTypeObject for result of PyString_Concat'))
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 3:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() succeeds (Py_DECREF() with deallocation on *LHS) (Py_DECREF() with deallocation on RHS)'
    'returning'
  Return value:
    repr(): PointerToRegion(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)))
    str(): (struct PyObject *)&RegionOnHeap('result of PyString_Concat', gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29)) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
    r->ob_refcnt: refs: 1 owned
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), region=Region('PyTypeObject for result of PyString_Concat'))
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 4:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() fails (Py_DECREF() without deallocation on *LHS) (Py_DECREF() without deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)&RegionForGlobal(gcc.VarDecl('PyExc_MemoryError')) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29

Trace 5:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() fails (Py_DECREF() without deallocation on *LHS) (Py_DECREF() with deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)&RegionForGlobal(gcc.VarDecl('PyExc_MemoryError')) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29

Trace 6:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() fails (Py_DECREF() with deallocation on *LHS) (Py_DECREF() without deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)&RegionForGlobal(gcc.VarDecl('PyExc_MemoryError')) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29

Trace 7:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as non-NULL'
    'when PyString_Concat() fails (Py_DECREF() with deallocation on *LHS) (Py_DECREF() with deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)&RegionForGlobal(gcc.VarDecl('PyExc_MemoryError')) from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29

Trace 8:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as NULL'
    'when PyString_Concat() does nothing due to NULL *lhs (Py_DECREF() without deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 9:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as non-NULL'
    'when treating unknown struct PyObject * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29 as NULL'
    'when PyString_Concat() does nothing due to NULL *lhs (Py_DECREF() with deallocation on RHS)'
    'returning'
  Return value:
    repr(): ConcreteValue(gcctype='struct PyObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=29), value=0)
    str(): (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: -1 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28

Trace 10:
  Transitions:
    'when treating unknown struct PyObject * * from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:27 as NULL'
  error: NullPtrArgument()
  error: possibly calling PyString_ConcatAndDel with NULL as argument 1 (lhs) at tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:29
  region for gcc.ParmDecl('rhs') on stack:
    repr(): RegionOnStack("region for gcc.ParmDecl('rhs')")
    str(): region for gcc.ParmDecl('rhs') on stack
    r->ob_refcnt: refs: 0 owned, 1 borrowed
    r->ob_type: PointerToRegion(gcctype='struct PyTypeObject *', loc=gcc.Location(file='tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c', line=27), region=Region("region-for-type-of-arg-gcc.ParmDecl('rhs')"))
  Exception:
    (struct PyObject *)0 from tests/cpychecker/refcounts/PyString_ConcatAndDel/basic/input.c:28