Calling (use-modules (opencog))) doesn't load opencog.scm

[noskill]

Script to reproduce the bug:

from opencog.scheme import  scheme_eval, scheme_eval_as
from opencog.type_constructors import *

atomspace = AtomSpace()
set_default_atomspace(atomspace)
scheme_eval(atomspace, '(use-modules (opencog))')
#scheme_eval(atomspace, '(load "/usr/share/guile/site/2.2/opencog.scm")')
scheme_eval(atomspace, '(TypeSet (Type "ConceptNode"))') # this line fails without previous