The expressions in SpecList are all of the form name/arity.
Note that unskipped/1 is superseded by the predicate set_flag(Proc, skip, off), which sets the procedure Proc to be unskipped.
Success:
[eclipse]: [user], skipped p/0.
q.
p :- q.
user compiled 60 bytes in 0.00 seconds
yes.
[eclipse]: trace.
Debugger switched on - creep mode
yes.
[eclipse]: p.
S (1) 0 CALL p (dbg)?- creep
S (1) 0 EXIT p (dbg)?- creep
yes.
[eclipse]: unskipped p/0.
yes.
[eclipse]: p.
(1) 0 CALL p (dbg)?- creep
(2) 1 CALL q (dbg)?- creep
(2) 1 EXIT q (dbg)?- creep
(1) 0 EXIT p (dbg)?- creep
yes.
Error:
unskipped Proc/1. (Error 4).
unskipped write(Term)/1. (Error 5).
unskipped do. (Error 5).
unskipped n/1. (Error 60).