zephyr/main: Move lexer constructor to within NLR handler block.
zephyr/main: Move lexer constructor to within NLR handler block.

And raise an exception when mp_lexer_new_from_file is called.

bvernoux/micropython,bvernoux/micropython,toolmacher/micropython,pozetroninc/micropython,MrSurly/micropython-esp32,selste/micropython,kerneltask/micropython,TDAbboud/micropython,AriZuu/micropython,alex-robbins/micropython,micropython/micropython-esp32,kerneltask/micropython,Timmenem/micropython,bvernoux/micropython,henriknelson/micropython,selste/micropython,pfalcon/micropython,selste/micropython,pfalcon/micropython,blazewicz/micropython,adafruit/circuitpython,oopy/micropython,TDAbboud/micropython,blazewicz/micropython,micropython/micropython-esp32,dmazzella/micropython,pozetroninc/micropython,Peetz0r/micropython-esp32,AriZuu/micropython,MrSurly/micropython,MrSurly/micropython,AriZuu/micropython,pramasoul/micropython,puuu/micropython,chrisdearman/micropython,lowRISC/micropython,deshipu/micropython,adafruit/micropython,adafruit/circuitpython,torwag/micropython,Peetz0r/micropython-esp32,hiway/micropython,HenrikSolver/micropython,PappaPeppar/micropython,oopy/micropython,infinnovation/micropython,toolmacher/micropython,pozetroninc/micropython,pramasoul/micropython,PappaPeppar/micropython,blazewicz/micropython,puuu/micropython,SHA2017-badge/micropython-esp32,trezor/micropython,torwag/micropython,Peetz0r/micropython-esp32,micropython/micropython-esp32,pfalcon/micropython,pozetroninc/micropython,deshipu/micropython,swegener/micropython,swegener/micropython,micropython/micropython-esp32,HenrikSolver/micropython,dmazzella/micropython,Timmenem/micropython,SHA2017-badge/micropython-esp32,bvernoux/micropython,hiway/micropython,Timmenem/micropython,Timmenem/micropython,hiway/micropython,hiway/micropython,puuu/micropython,alex-robbins/micropython,ryannathans/micropython,MrSurly/micropython-esp32,chrisdearman/micropython,henriknelson/micropython,infinnovation/micropython,swegener/micropython,kerneltask/micropython,torwag/micropython,pfalcon/micropython,ryannathans/micropython,TDAbboud/micropython,torwag/micropython,tobbad/micropython,MrSurly/micropython-esp32,tralamazza/micropython,MrSurly/micropython-esp32,adafruit/micropython,oopy/micropython,cwyark/micropython,chrisdearman/micropython,SHA2017-badge/micropython-esp32,infinnovation/micropython,lowRISC/micropython,adafruit/micropython,toolmacher/micropython,pramasoul/micropython,henriknelson/micropython,alex-robbins/micropython,lowRISC/micropython,cwyark/micropython,Peetz0r/micropython-esp32,trezor/micropython,SHA2017-badge/micropython-esp32,deshipu/micropython,pfalcon/micropython,puuu/micropython,dmazzella/micropython,henriknelson/micropython,oopy/micropython,infinnovation/micropython,blazewicz/micropython,ryannathans/micropython,MrSurly/micropython,AriZuu/micropython,ryannathans/micropython,pozetroninc/micropython,kerneltask/micropython,infinnovation/micropython,Timmenem/micropython,torwag/micropython,PappaPeppar/micropython,oopy/micropython,TDAbboud/micropython,selste/micropython,deshipu/micropython,alex-robbins/micropython,cwyark/micropython,MrSurly/micropython,henriknelson/micropython,MrSurly/micropython,tralamazza/micropython,HenrikSolver/micropython,Peetz0r/micropython-esp32,tobbad/micropython,swegener/micropython,cwyark/micropython,HenrikSolver/micropython,adafruit/circuitpython,selste/micropython,dmazzella/micropython,toolmacher/micropython,TDAbboud/micropython,micropython/micropython-esp32,PappaPeppar/micropython,adafruit/circuitpython,trezor/micropython,kerneltask/micropython,pramasoul/micropython,adafruit/circuitpython,toolmacher/micropython,cwyark/micropython,MrSurly/micropython-esp32,ryannathans/micropython,adafruit/micropython,alex-robbins/micropython,tralamazza/micropython,adafruit/micropython,lowRISC/micropython,blazewicz/micropython,SHA2017-badge/micropython-esp32,adafruit/circuitpython,tobbad/micropython,hiway/micropython,deshipu/micropython,AriZuu/micropython,lowRISC/micropython,tobbad/micropython,tralamazza/micropython,swegener/micropython,chrisdearman/micropython,HenrikSolver/micropython,trezor/micropython,puuu/micropython,trezor/micropython,PappaPeppar/micropython,tobbad/micropython,chrisdearman/micropython,pramasoul/micropython,bvernoux/micropython