>>-TRACE(--+--------+--)--------------------------------------->< +-option-+
?
, one of the alphabetic character options associated with the TRACE instruction (that is, starting with A
, C
, E
, F
, I
, L
, N
, O
, or R
), or both. (See the TRACE instruction in Section 2.29.1, “Trace Alphabetic Character (Word) Options” for full details.)
Example 7.92. Builtin function TRACE
TRACE() -> "?R" /* maybe */ TRACE("O") -> "?R" /* also sets tracing off */ TRACE("?I") -> "O" /* now in interactive debugging */