Remove stray escapes to avoid warnings from grep 3.8 which breaks
expected test output.

diff --git a/testsuite/tests/hsc2hs/Makefile b/testsuite/tests/hsc2hs/Makefile
--- a/testsuite/tests/hsc2hs/Makefile
+++ b/testsuite/tests/hsc2hs/Makefile
@@ -47,5 +47,5 @@ T12504:
 ifeq "$(WINDOWS)" "YES"
 	grep '{-# LINE 1 \"T12504\\\\path\\\\to\\\\$@\.hsc\" #-}' T12504/path/to/$@.hs
 else
-	grep '{-# LINE 1 \"T12504/path/to/$@\.hsc\" #-}' T12504/path/to/$@.hs
+	grep '{-# LINE 1 "T12504/path/to/$@\.hsc" #-}' T12504/path/to/$@.hs
 endif
diff --git a/testsuite/tests/numeric/should_run/T7014.primops b/testsuite/tests/numeric/should_run/T7014.primops
--- a/testsuite/tests/numeric/should_run/T7014.primops
+++ b/testsuite/tests/numeric/should_run/T7014.primops
@@ -1,8 +1,8 @@
 and#
 or#
 uncheckedShift.*#
-\+#
-\-#
++#
+-#
 \*#
 quotInt#
 remInt#
diff --git a/testsuite/tests/simplCore/should_compile/Makefile b/testsuite/tests/simplCore/should_compile/Makefile
--- a/testsuite/tests/simplCore/should_compile/Makefile
+++ b/testsuite/tests/simplCore/should_compile/Makefile
@@ -226,7 +226,7 @@ str-rules:
 # g should have been collapsed into one defininition by CSE.
 .PHONY: T13340
 T13340:
-	'$(TEST_HC)' $(TEST_HC_OPTS) -c -O T13340.hs -ddump-simpl -dsuppress-all | grep -c '\+#'
+	'$(TEST_HC)' $(TEST_HC_OPTS) -c -O T13340.hs -ddump-simpl -dsuppress-all | grep -c '+#'
 
 
 # We expect to see all dictionaries specialized away.
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<tr><td><span title='2021-09-21 20:35:49 +0000'>2021-09-21</span></td><td><a href='/guix/commit/gnu/installer/keymap.scm?id=d58e52b0713648dd30d41b41277854a935d8d15a'>installer: keymap: Fix optional fields handling.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://issues.guix.gnu.org/50723&gt;.

The keymap xml contains optional shortDescription and description fields. The
assoc-ref call on those fields can return false, handle it correctly.

* gnu/installer/keymap.scm (xkb-rules-&gt;models+layouts): Introduce a new
"maybe-empty" helper to deal with optional fields. Use it for shortDescription
and description fields.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-04-09 02:42:54 +0000'>2020-04-09</span></td><td><a href='/guix/commit/gnu/installer/keymap.scm?id=91c231a2223440081426929828a23c7baa0214fd'>installer: Allow Alt+Shift toggle from non-Latin keyboard layouts.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/40493&gt;.

* gnu/installer/newt/keymap.scm (%non-latin-layouts): New variable.
(%non-latin-variants): New variable.
(%latin-layout+variants): New variable.
(toggleable-latin-layout): New procedure to compute combined layouts.
(run-keymap-page): Use it.
(keyboard-layout-&gt;configuration): Apply it in config.scm.
(run-layout-page): Mention Alt+Shift.
* gnu/installer/keymap.scm (kmscon-update-keymap): Pass on XKB options.
* gnu/installer/record.scm (&lt;installer&gt;): Adjust code comments.
* gnu/installer.scm (apply-keymap): Pass on XKB options.
(installer-steps): Adjust code comments.
* gnu/packages/patches/kmscon-runtime-keymap-switch.patch: Apply XKB options.
</span></span></td><td>Florian Pelz</td></tr>