GCC build failure, HEAD@181181 on native

[GCC regression tester <regress at geoffk dot org>]

With your recent patch, GCC HEAD revision 181181 had problems on:
native: build (seems to have progressed further)
Attached is build output for those targets.
The previous build was of revision 181180.

Log information for changes since the last build:
------------------------------------------------------------------------
r181181 | fxcoudert | 2011-11-08 15:15:11 -0800 (Tue, 08 Nov 2011) | 5 lines
Changed paths:
   M /trunk/gcc/fortran/ChangeLog
   M /trunk/gcc/fortran/expr.c
   M /trunk/gcc/testsuite/ChangeLog
   M /trunk/gcc/testsuite/gfortran.dg/string_5.f90

	PR fortran/50409
	* expr.c (gfc_simplify_expr): Substrings can't have negative
	length.
	* gcc/testsuite/gfortran.dg/string_5.f90: Improve testcase.

------------------------------------------------------------------------

For more information, see <http://glutton.geoffk.org/HEAD/>.

Attachment: native-log.txt
Description: Text document

-- 
Geoffrey Keating <geoffk@geoffk.org> 
(via an automated GCC regression-testing script.)