Generate subexpression code for deletion of C++ classes.

Cython/Compiler/Nodes.py

@@ -5452,8 +5452,9 @@ class DelStatNode(StatNode):
                 arg.generate_deletion_code(
                     code, ignore_nonexisting=self.ignore_nonexisting)
             elif arg.type.is_ptr and arg.type.base_type.is_cpp_class:
-                arg.generate_result_code(code)
+                arg.generate_evaluation_code(code)
                 code.putln("delete %s;" % arg.result())
+                arg.generate_disposal_code(code)
             # else error reported earlier
 
     def annotate(self, code):

tests/run/cpp_classes.pyx

@@ -179,3 +179,18 @@ def test_template_class_member():
     del o
     assert destructor_count - start_destructor_count == 2, \
            destructor_count - start_destructor_count
+
+
+ctypedef vector[int]* vector_int_ptr
+cdef vector[vector_int_ptr] create_to_delete() except *:
+    cdef vector[vector_int_ptr] v
+    v.push_back(new vector[int]())
+    return v
+cdef int f(int x):
+    return x
+
+def test_nested_del():
+    cdef vector[vector_int_ptr] v
+    v.push_back(new vector[int]())
+    del v[0]
+    del create_to_delete()[f(f(0))]