And I believe this works as asked.  Below I execute the same “load” three times under guile, under bash: first two w/o “2>/dev/null”, and the third time with “2>/dev/null” .  For the fourth time, I use “2>/dev/null -s ,update” to process as script (and skip the banner).

mwette$ guile
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (load ",update") 
;;; note: source file /Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm
;;;       newer than compiled /Users/mwette/.cache/guile/ccache/2.0-LE-8-2.0/Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm.go
;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;;       or pass the --no-auto-compile argument to disable.
;;; compiling /Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm
;;; compiled /Users/mwette/.cache/guile/ccache/2.0-LE-8-2.0/Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm.go
$1 = 0
scheme@(guile-user)> ^D

mwette$ guile 
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (load ",update")
;;; note: source file /Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm
;;;       newer than compiled /Users/mwette/.cache/guile/ccache/2.0-LE-8-2.0/Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm.go
;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;;       or pass the --no-auto-compile argument to disable.
;;; compiling /Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm
;;; compiled /Users/mwette/.cache/guile/ccache/2.0-LE-8-2.0/Users/mwette/repo/sv/nyacc.git/module/nyacc/lang/c99/cpp.scm.go
$1 = 0
scheme@(guile-user)> ^D

mwette$ guile 2>/dev/null
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (load ",update")
$1 = 0
scheme@(guile-user)> ^D

mwette$ guile 2>/dev/null -s ,update

mwette$