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-rw-r--r--tests/rustdoc-ui/doctest/display-output.rs15
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diff --git a/tests/rustdoc-ui/doctest/display-output.rs b/tests/rustdoc-ui/doctest/display-output.rs
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+++ b/tests/rustdoc-ui/doctest/display-output.rs
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+// Test that `--show-output` has an effect and `allow(unused)` can be overridden.
+
+// check-pass
+// edition:2018
+// compile-flags:--test --test-args=--show-output
+// normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
+// normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+
+/// ```
+/// #![warn(unused)]
+/// let x = 12;
+///
+/// fn foo(x: &dyn std::fmt::Display) {}
+/// ```
+pub fn foo() {}