Test for bad cimported module attributes.

tests/errors/cimport_attributes.pyx

+# mode: error
+
+
+cimport libcpp
+print libcpp.no_such_attribute
+
+cimport libcpp.map
+print libcpp.map.no_such_attribute
+
+from libcpp cimport vector
+print vector.no_such_attribute
+
+from libcpp cimport vector as my_vector
+print my_vector.no_such_attribute
+
+from libcpp cimport vector as my_vector_with_shadow
+from libcpp import vector as my_vector_with_shadow
+print my_vector_with_shadow.no_such_attribute   # OK (if such a module existed at runtime)
+
+_ERRORS = u"""
+5:12: cimported module has no attribute 'no_such_attribute'
+8:16: cimported module has no attribute 'no_such_attribute'
+11:12: cimported module has no attribute 'no_such_attribute'
+14:15: cimported module has no attribute 'no_such_attribute'
+"""