diff --git a/tests/test-dirs/type-enclosing/need-parens.t b/tests/test-dirs/type-enclosing/need-parens.t
new file mode 100644
index 0000000000..21954932e1
--- /dev/null
+++ b/tests/test-dirs/type-enclosing/need-parens.t
@@ -0,0 +1,21 @@
+FIXME: locate on `M.(|+)` should work:
+  $ $MERLIN single locate -position 2:11 -filename test.ml <<'EOF' | \
+  > jq '.value'
+  > module M = struct let (+) a b = a + b end
+  > let _ = M.(+)
+  > EOF
+  "Not in environment 'M.+'"
+
+Locate on `M.(+|)` should work:
+  $ $MERLIN single locate -position 2:12 -filename test.ml <<'EOF' | \
+  > jq '.value'
+  > module M = struct let (+) a b = a + b end
+  > let _ = M.(+)
+  > EOF
+  {
+    "file": "test.ml",
+    "pos": {
+      "line": 1,
+      "col": 22
+    }
+  }