ansi .6.2.0455
<CORE>
start a colon nested-word but do not use CREATE - so no name
is given to the colon-definition that follows. When the definition
is finished at the corresponding ; the start-address (ie.
the execution token) can be found on the outer cs.stack that may
be stored used elsewhere then.
reference: p4_colon_noname in ../src/core.c:2061, export CO :NONAME