1 # 1 "header1.h"
2 # 1 "<built-in>"
3 # 1 "<command-line>"
4 # 1 "/usr/include/stdc-predef.h" 1 3 4
5 # 1 "<command-line>" 2
6 # 1 "header1.h"
7 # 18 "header1.h"
8 void header1_function_a(int a);
9 # 1 "header2.h" 1
10 # 13 "header2.h"
11 void header2_function(int x);
12 # 20 "header1.h" 2
13 void header1_function_b(int b);
14