[Bug fortran/26870] [fortran] Printing dynamic array fails

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26870

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
With gdb-11.1 we have:
...
(gdb) PASS: gdb.fortran/dynamic.exp: ptype vart
p varz^M
$26 = <error reading variable>^M
(gdb) FAIL: gdb.fortran/dynamic.exp: p varz
p vart^M
$27 = <error reading variable>^M
(gdb) FAIL: gdb.fortran/dynamic.exp: p vart
...
which means we no longer get the "warning: array or string index out of range"
which is good.

The error message is a bit uninformative, and could be improved using:
...
diff --git a/gdb/valprint.c b/gdb/valprint.c
index 324055da93f..05740c838ad 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -1050,7 +1050,7 @@ do_val_print (struct value *value, struct ui_file
*stream, int recurs
e,
   catch (const gdb_exception_error &except)
     {
       fprintf_styled (stream, metadata_style.style (),
-                     _("<error reading variable>"));
+                     _("<error reading variable: %s>"), except.what ());
     }
 }

...
to:
...
(gdb) PASS: gdb.fortran/dynamic.exp: ptype vart
p varz^M
$26 = <error reading variable: failed to get range bounds>^M
(gdb) FAIL: gdb.fortran/dynamic.exp: p varz
...

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