Fatal error: exception Stdlib.Parsing.Parse_error

[Niols]

When parsing:

[[:\<:]

Morbig fails with:

Fatal error: exception Stdlib.Parsing.Parse_error

This example might seem esoteric, but that's the minimal version of a test met in real life:

if [[ ! $RBENV_GEMSETS =~ [[:\<:]]global[[:\>:]] ]]; then
RBENV_GEMSETS="$RBENV_GEMSETS global"
fi