logilab-astng #124340 (very) buggy generator support [validation pending]

discovered through https://www.logilab.org/ticket/122793

prioritynormal
typebug
done in0.24.3
load0.200
load left0.000
closed by#70fdcdb4156b enhanced generator support. Closes #124340
patchenhanced generator support. Closes #124340 [applied]enhanced generator support. Closes #124340 [applied]