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='2022-01-13 23:11:19 +0100'>2022-01-13</span></td><td><a href='/guix/commit/gnu/packages/patches/bubblewrap-fix-locale-in-tests.patch?id=904a6567a89014bdad476f7aee0c5ad5e4898ea2'>gnu: bubblewrap: Update to 0.5.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/bubblewrap-fix-locale-in-tests.patch: Add it.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/virtualization.scm (bubblewrap): Update to 0.5.0.
[source]: Add patch.
[arguments]: Adjust test substitutions.
[inputs]: Remove labels.
[native-inputs]: Remove labels.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>kiasoc5</td></tr>