diff --git a/tests/rustdoc/heterogeneous-concat.rs b/tests/rustdoc/heterogeneous-concat.rs
new file mode 100644
index 00000000000..8443ccc559e
--- /dev/null
+++ b/tests/rustdoc/heterogeneous-concat.rs
@@ -0,0 +1,11 @@
+// regression test for https://github.com/rust-lang/rust/issues/85763
+
+#![crate_name = "foo"]
+
+//@ has foo/index.html '//main' 'Some text that should be concatenated.'
+#[doc = " Some text"]
+#[doc = r" that should"]
+/// be concatenated.
+pub fn main() {
+    println!("Hello, world!");
+}