Welcome to psql 8.1devel, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

postgres=# set trace_plpgsql to on;
SET
postgres=# select fa(10);
trace:  executing function fa
trace:  for with integer loopvar on 3:   FOR k IN 1..i LOOP
dbg. s
trace:  raise on 4:     RAISE NOTICE '%', k;
dbg. p
var-. k
trace:  var k as int4 has 1
dbg. l
trace:  source of function fa
  1: DECLARE x integer = 1;
  2: BEGIN
  3:   FOR k IN 1..i LOOP
  4:     RAISE NOTICE '%', k;
  5:     x := x + 1;
  6:   END LOOP;
  7:   RETURN x;
  8: END;
  9: 

dbg. s
NOTICE:  1
trace:  assignment on 5:     x := x + 1;
dbg. b
trace:  Breakpoint set on
dbg. c
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  2
trace:  assignment on 5:     x := x + 1;
trace:  stop on breakpoint
dbg. c
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  3
trace:  assignment on 5:     x := x + 1;
trace:  stop on breakpoint
dbg. p
var-. *
trace:  var k as int4 has 3
trace:  var x as int4 has 3
trace:  var found as bool has f
trace:  var $1 as int4 has 10
dbg. c
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  4
trace:  assignment on 5:     x := x + 1;
trace:  stop on breakpoint
dbg. b
trace:  Breakpoint set off
dbg. c
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  5
trace:  assignment on 5:     x := x + 1;
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  6
trace:  assignment on 5:     x := x + 1;
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  7
trace:  assignment on 5:     x := x + 1;
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  8
trace:  assignment on 5:     x := x + 1;
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  9
trace:  assignment on 5:     x := x + 1;
trace:  raise on 4:     RAISE NOTICE '%', k;
NOTICE:  10
trace:  assignment on 5:     x := x + 1;
trace:  return on 7:   RETURN x;
 fa 
----
 11
(1 row)

postgres=# \q

Process SQL finished