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[Ada] Build failure: a-numaux.adb (Debian/x86)

Bootstrap mostly works with the current CVS tree (however, the
comparison failures are still present), but compiling a-numaux.adb
results in the following bug box.  This seems to be a new problem.

../../xgcc -B../../ -c -g -O2   -gnatpg -I. -I/home/rusfw/src-cvs/gnu/gcc/gcc/ada a-numaux.adb
+===========================GNAT BUG DETECTED==============================+
| 5.00w (20010924) (i686-pc-linux-gnu) GCC error:                          |
| Tree check: expected tree_list, have string_cst in                       |
|    check_operand_nalternatives, at stmt.c:1953                           |
| No source file position information available                            |
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I think this might have been introduced by:

Look at the following change:

-      int nalternatives = n_occurrences (',', TREE_STRING_POINTER (tmp));


+      int nalternatives
+	= n_occurrences (',', TREE_STRING_POINTER (TREE_VALUE (tmp)));

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