Regression test for #901.

Close #901.
diff --git a/test/regression/0900/0901.unit b/test/regression/0900/0901.unit
new file mode 100644
index 0000000..e805854
--- /dev/null
+++ b/test/regression/0900/0901.unit
@@ -0,0 +1,4 @@
+>>>
+// Line Separator character U+2028 in brackets here <
>.
+<<<
+// Line Separator character U+2028 in brackets here <
>.
\ No newline at end of file