New Issue: Weird error and halt upon 'export CHPL_REGEXP=none'

18021, "vasslitvinov", "Weird error and halt upon 'export CHPL_REGEXP=none'", "2021-07-01T19:12:34Z"

Setting export CHPL_REGEXP=none without setting CHPL_RE2 when running the compiler gives me:

error: CHPL_HOME=XXX CHPL_RUNTIME_INCL=XXX/runtime/include CHPL_RUNTIME_LIB=XXX/lib CHPL_THIRD_PARTY=XXX/third-party XXX/util/printchplenv --all --internal --no-tidy --simple 2> /dev/null did not run successfully

which is understandable, yet undesirable.

My environment is:

CHPL_COMM=none
CHPL_DEVELOPER=1
CHPL_GMP=none
CHPL_HOME=XXX
CHPL_LLVM=none
CHPL_MEM=cstdlib
CHPL_REGEXP=none
CHPL_TASKS=fifo
CHPL_VERIFY=1