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diff --git a/tests/rustdoc/summary-codeblock-31899.rs b/tests/rustdoc/summary-codeblock-31899.rs
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+++ b/tests/rustdoc/summary-codeblock-31899.rs
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+// https://github.com/rust-lang/rust/issues/31899
+#![crate_name="issue_31899"]
+
+// @has issue_31899/index.html
+// @hasraw - 'Make this line a bit longer.'
+// @!hasraw - 'rust rust-example-rendered'
+// @!hasraw - 'use ndarray::arr2'
+// @!hasraw - 'prohibited'
+
+/// A tuple or fixed size array that can be used to index an array.
+/// Make this line a bit longer.
+///
+/// ```
+/// use ndarray::arr2;
+///
+/// let mut a = arr2(&[[0, 1], [0, 0]]);
+/// a[[1, 1]] = 1;
+/// assert_eq!(a[[0, 1]], 1);
+/// assert_eq!(a[[1, 1]], 1);
+/// ```
+///
+/// **Note** the blanket implementation that's not visible in rustdoc:
+/// `impl<D> NdIndex for D where D: Dimension { ... }`
+pub fn bar() {}
+
+/// Some line
+///
+/// # prohibited
+pub fn foo() {}
+
+/// Some line
+///
+/// 1. prohibited
+/// 2. bar
+pub fn baz() {}
+
+/// Some line
+///
+/// - prohibited
+/// - bar
+pub fn qux() {}
+
+/// Some line
+///
+/// * prohibited
+/// * bar
+pub fn quz() {}
+
+/// Some line
+///
+/// > prohibited
+/// > bar
+pub fn qur() {}
+
+/// Some line
+///
+/// prohibited
+/// =====
+///
+/// Second
+/// ------
+pub fn qut() {}