The Regina PDF documentation for the TRACE instruction defines SETTINGS as a one-character value,
but in truth, it can be any symbol or constant (both of which are taken as a constant), of which, only the first
letter is examined (after capitalization).
is legal. So is:
Of course, only the first character of the string is used (after it's capitalized).
The Regina documentation is different than the REXX TRL and TRL2 documentation, as well as the
R4 (Kilowatt Software), IBM CMS and TSO REXX documentation definitions.
All those specify that the first argument can be a symbol or string, both of which are taken as a constant.
________________________________________________________________ Gerard Schildberger