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-rw-r--r--js/src/jit-test/tests/self-test/printer-escape-seq.js5
1 files changed, 5 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/self-test/printer-escape-seq.js b/js/src/jit-test/tests/self-test/printer-escape-seq.js
new file mode 100644
index 0000000000..80c7fa6b82
--- /dev/null
+++ b/js/src/jit-test/tests/self-test/printer-escape-seq.js
@@ -0,0 +1,5 @@
+// |jit-test| skip-if: !getBuildConfiguration("debug")
+
+// Due to sign extension of characters, we might accidentally extend \xAF into
+// \uFFAF, which is incorrect.
+assertEq(disassemble("'\xAF'").includes("FFAF"), false);