1 /* The following is written to tickle a specific bug in the macro
2    table code (now hopefully fixed), which doesn't insert new included
3    files in the #including file's list in the proper place.  They
4    should be sorted by the number of the line which #included them, in
5    increasing order, but the sense of the comparison was reversed, so
6    the list ends up being built backwards.  This isn't a problem by
7    itself, but the code to pick new, non-conflicting line numbers for
8    headers alleged to be #included at the same line as some other
9    header assumes that the list's line numbers are in ascending order.
10 
11    So, given the following input, lineinc1.h gets added to lineinc.c's
12    #inclusion list first, at line 10.  When the debug info reader
13    tries to add lineinc2.h at line 10 as well, the code will notice the
14    duplication --- since there's only one extant element in the list,
15    it'll find it --- and insert it after lineinc1.h, with line 11.
16    Since the code is putting the list in order of descending
17    #inclusion line number, the list is now out of order.  When we try
18    to #include lineinc3.h at line 11, we won't notice the duplication.  */
19 
20 #line 10
21 #include "lineinc1.h"
22 #line 10
23 #include "lineinc2.h"
24 #line 11
25 #include "lineinc3.h"
26 
27 int
28 main (int argc, char **argv)
29 {
30 }
31