teg@burken:~/test/ada/bugs$ gnatmake gnat_bug.adb
gcc-4.3 -c gnat_bug.adb
| 4.3.2 (i486-pc-linux-gnu) Assert_Failure atree.adb:886
| Error detected at gnat_bug.adb:13:10
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.
| Use a subject line meaningful to you and us to track the bug.
| Include the entire contents of this bug box in the report.
| Include the exact gcc-4.3 or gnatmake command that you entered.
| Also include sources listed below in gnatchop format
| (concatenated together with no headers between files).
Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.