diff --git a/tests/rustdoc/double-hyphen-to-dash.rs b/tests/rustdoc/double-hyphen-to-dash.rs
new file mode 100644
index 0000000000000..66905f90cfc93
--- /dev/null
+++ b/tests/rustdoc/double-hyphen-to-dash.rs
@@ -0,0 +1,9 @@
+// This test ensures that `--` (double-hyphen) is correctly converted into `–` (dash).
+
+#![crate_name = "foo"]
+
+// @has 'foo/index.html' '//*[@class="desc docblock-short"]' '–'
+// @has 'foo/struct.Bar.html' '//*[@class="docblock"]' '–'
+
+/// --
+pub struct Bar;