Added default ret0 in lambda parsing.
Added default ret0 in lambda parsing.

chavolla/Buzz,MISTLab/Buzz,MISTLab/Buzz,erikarn/Buzz,naturalmechanics/Buzz,NESTLab/Buzz,NESTLab/Buzz,naturalmechanics/Buzz,naturalmechanics/Buzz,erikarn/Buzz,erikarn/Buzz,NESTLab/Buzz,chavolla/Buzz,chavolla/Buzz,MISTLab/Buzz