Clear expressionFunction at the end of each expression.
Clear expressionFunction at the end of each expression.

This fixes the erroneous pass on test 16.
sidmutha/SDC,JohanEngelen/SDC,SDC-Developers/SDC,schancel/SDC,deadalnix/SDC,deadalnix/SDC,SDC-Developers/SDC,bpr/SDC,JohanEngelen/SDC,carlor/SDC,DmitryOlshansky/SDC,bpr/SDC,JohanEngelen/SDC,sidmutha/SDC,schancel/SDC,UplinkCoder/SDC,SDC-Developers/SDC,schancel/SDC,bpr/SDC,UplinkCoder/SDC,DmitryOlshansky/SDC,UplinkCoder/SDC,sidmutha/SDC,deadalnix/SDC,DmitryOlshansky/SDC