From 2d6267a7a8ae0399f2d363b6ac667fee0b53a1a0 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sat, 30 May 2020 15:36:57 +0200
Subject: [PATCH] Add test for doc alias attribute validation

---
 src/test/rustdoc-ui/check-doc-alias-attr.rs   |  9 +++++++++
 .../rustdoc-ui/check-doc-alias-attr.stderr    | 20 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 src/test/rustdoc-ui/check-doc-alias-attr.rs
 create mode 100644 src/test/rustdoc-ui/check-doc-alias-attr.stderr

diff --git a/src/test/rustdoc-ui/check-doc-alias-attr.rs b/src/test/rustdoc-ui/check-doc-alias-attr.rs
new file mode 100644
index 0000000000000..2f01099107d9e
--- /dev/null
+++ b/src/test/rustdoc-ui/check-doc-alias-attr.rs
@@ -0,0 +1,9 @@
+#![feature(doc_alias)]
+
+#[doc(alias = "foo")] // ok!
+pub struct Bar;
+
+#[doc(alias)] //~ ERROR
+#[doc(alias = 0)] //~ ERROR
+#[doc(alias("bar"))] //~ ERROR
+pub struct Foo;
diff --git a/src/test/rustdoc-ui/check-doc-alias-attr.stderr b/src/test/rustdoc-ui/check-doc-alias-attr.stderr
new file mode 100644
index 0000000000000..480acc821aaa8
--- /dev/null
+++ b/src/test/rustdoc-ui/check-doc-alias-attr.stderr
@@ -0,0 +1,20 @@
+error: doc alias attribute expects a string: #[doc(alias = "0")]
+  --> $DIR/check-doc-alias-attr.rs:6:7
+   |
+LL | #[doc(alias)]
+   |       ^^^^^
+
+error: doc alias attribute expects a string: #[doc(alias = "0")]
+  --> $DIR/check-doc-alias-attr.rs:7:7
+   |
+LL | #[doc(alias = 0)]
+   |       ^^^^^^^^^
+
+error: doc alias attribute expects a string: #[doc(alias = "0")]
+  --> $DIR/check-doc-alias-attr.rs:8:7
+   |
+LL | #[doc(alias("bar"))]
+   |       ^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+