UNDEFINED + ({}) and `+= implemented Rev: src/docode.c:1.44 Rev: src/lex.c:1.62 Rev: src/modules/Gmp/mpz_glue.c:1.38 Rev: src/operators.c:1.46 Rev: src/program.c:1.109 Rev: src/program.h:1.50 Rev: src/security.c:1.10 Rev: src/testsuite.in:1.146