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-rw-r--r--js/src/jit-test/tests/auto-regress/bug1863390.js6
1 files changed, 6 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/auto-regress/bug1863390.js b/js/src/jit-test/tests/auto-regress/bug1863390.js
new file mode 100644
index 0000000000..f414fceb7c
--- /dev/null
+++ b/js/src/jit-test/tests/auto-regress/bug1863390.js
@@ -0,0 +1,6 @@
+var left = "left-rope-child";
+var right = newString("right-rope-child", {twoByte: true});
+var rope = newRope(left, right);
+var result = rope.substring(0, left.length + 1);
+
+assertEq(result, "left-rope-childr");