PROGRAM
 GLOBAL_LIST
  DECLARATION
   VARIABLE_LIST
    IDENTIFIER_DATA(a)
    IDENTIFIER_DATA(b)
  DECLARATION
   VARIABLE_LIST
    IDENTIFIER_DATA(c)
    IDENTIFIER_DATA(d)
  FUNCTION
   IDENTIFIER_DATA(simplify)
   VARIABLE_LIST
    IDENTIFIER_DATA(e)
    IDENTIFIER_DATA(f)
   BLOCK
    STATEMENT_LIST
     ASSIGNMENT_STATEMENT
      IDENTIFIER_DATA(a)
      NUMBER_DATA(-29)
     PRINT_STATEMENT
      STRING_DATA("a=")
      IDENTIFIER_DATA(a)
     IF_STATEMENT
      RELATION
       IDENTIFIER_DATA(a)
       NUMBER_DATA(0)
      ASSIGNMENT_STATEMENT
       IDENTIFIER_DATA(b)
       EXPRESSION((null))
        IDENTIFIER_DATA(simplify)
        EXPRESSION_LIST
         IDENTIFIER_DATA(c)
         IDENTIFIER_DATA(d)
     RETURN_STATEMENT
      NUMBER_DATA(0)
String table:
0: "a="
-- 
Globals:
simplify: function 0:
	2 local variables, 2 are parameters:
	f: parameter 1
	e: parameter 0
d: global variable
c: global variable
b: global variable
a: global variable
-- 
Linked global var 'a'
Linked string 0
Linked global var 'a'
Linked global var 'a'
Linked global var 'b'
Linked function 0 ('simplify')
Linked global var 'c'
Linked global var 'd'