Normally we'd mark it broken, but perversely missing regexp support
actually makes the test pass.
---
 test/T670-duplicate-mid.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/test/T670-duplicate-mid.sh b/test/T670-duplicate-mid.sh
index bf8cc3a8..fd7df057 100755
--- a/test/T670-duplicate-mid.sh
+++ b/test/T670-duplicate-mid.sh
@@ -48,7 +48,11 @@ notmuch search --output=files subject:'"message 2"' | notmuch_dir_sanitize > OUT
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest 'Regexp search for second subject'
-test_subtest_known_broken
+# Note that missing field processor support really means the test
+# doesn't make sense, but it happens to pass.
+if [ $NOTMUCH_HAVE_XAPIAN_FIELD_PROCESSOR -eq 1 ]; then
+    test_subtest_known_broken
+fi
 cat <<EOF >EXPECTED
 MAIL_DIR/copy0
 MAIL_DIR/copy1
-- 
2.18.0

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