1:      1  1 CALL DET   interpreter_lib:main/2-0 
mtrace> valid commands are:
a, EOF:			abort the current execution.
b <module> <name>:	set a breakpoint on the predicate
			or function <module>:<name>.
c:			continue to end of program, not printing the trace.
C:			continue to end of program, printing the trace.
f:			finish this call, not printing the trace.
F:			finish this call, printing the trace.
<N> g:			go to event #N, not printing the trace.
<N> G:			go to event #N, printing the trace.
p:			print the variables live at this point.
r:			continue until forward execution is resumed.
[<N>] [s]:		skip N events, not printing the trace (default: N=1).
[<N>] S:		skip N events, printing the trace (default: N=1).
?:			list all the breakpoints.
+ <N>:			enable breakpoint #N.
- <N>:			disable breakpoint #N.
mtrace> mtrace> Pure Prolog Interpreter.

Consulting file `interpreter_lib.m'...
      45:     20  4 CALL DET   interpreter_lib:consult_until_eof/4-0 
mtrace>           HeadVar__1           		[]
          HeadVar__3           		state('<<c_pointer>>')
mtrace>       47:     22  6 CALL DET   parser:read_term/3-0 
mtrace>           HeadVar__2           		state('<<c_pointer>>')
mtrace>    13300:     22  6 EXIT DET   parser:read_term/3-0 
mtrace>           HeadVar__1           		term(varset(0, empty, empty), functor(atom(":-"), [functor(atom("module"), [functor(atom("interpreter"), [], context("interpreter_lib.m", 22))], context("interpreter_lib.m", 22))], context("interpreter_lib.m", 22)))
          HeadVar__3           		state('<<c_pointer>>')
mtrace>  0: + interpreter_lib:consult_until_eof
mtrace> mtrace> ?-