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diff --git a/tests/rustdoc/highlight-invalid-rust-12834.rs b/tests/rustdoc/highlight-invalid-rust-12834.rs
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+++ b/tests/rustdoc/highlight-invalid-rust-12834.rs
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+// Tests that failing to syntax highlight a rust code-block doesn't cause
+// rustdoc to fail, while still rendering the code-block (without highlighting).
+// https://github.com/rust-lang/rust/issues/12834
+
+#![crate_name="issue_12834"]
+#![allow(rustdoc::invalid_rust_codeblocks)]
+
+// @has issue_12834/fn.foo.html
+// @has - //pre 'a + b '
+
+/// ```
+/// a + b ∈ Self ∀ a, b ∈ Self
+/// ```
+pub fn foo() {}