Fix name context in genexp optimisation
Fix name context in genexp optimisation

serge-sans-paille/pythran,hainm/pythran,pbrunet/pythran,hainm/pythran,pombredanne/pythran,pombredanne/pythran,pombredanne/pythran,artas360/pythran,artas360/pythran,pbrunet/pythran,artas360/pythran,serge-sans-paille/pythran,pbrunet/pythran,hainm/pythran