obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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if you have obtained the source via the command 'git clone',
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1 files changed, 26 insertions, 0 deletions

diff --git a/gcc/testsuite/gfortran.dg/where_nested_1.f90 b/gcc/testsuite/gfortran.dg/where_nested_1.f90
new file mode 100644
index 000000000..c28cfcd96
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/where_nested_1.f90
@@ -0,0 +1,26 @@
+! { dg-do compile }
+! PR 25423: Nested WHERE constructs.
+program nested_where
+
+    implicit none
+    integer :: a(4)
+    logical :: mask1(4) = (/.TRUE., .TRUE., .FALSE., .FALSE./), &
+               mask2(4) = (/.TRUE., .FALSE., .TRUE., .FALSE./)
+
+    where (mask1)
+        where (mask2)
+            a = 1
+        elsewhere
+            a = 2
+        end where
+    elsewhere
+        where (mask2)
+            a = 3
+        elsewhere
+            a = 4
+        end where
+    end where
+
+    print *, a
+
+end program nested_where