From 23a2ba6e53cd5cd8c4cc2f75cc1e7d2ac20d9cbc Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Mon, 6 Jul 2020 16:11:32 +0200
Subject: [PATCH] Add more tests for doc alias

---
 .../check-doc-alias-attr-location.rs          | 13 ++++++++++++
 .../check-doc-alias-attr-location.stderr      | 20 +++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 src/test/rustdoc-ui/check-doc-alias-attr-location.rs
 create mode 100644 src/test/rustdoc-ui/check-doc-alias-attr-location.stderr

diff --git a/src/test/rustdoc-ui/check-doc-alias-attr-location.rs b/src/test/rustdoc-ui/check-doc-alias-attr-location.rs
new file mode 100644
index 00000000000..e209da6e2c3
--- /dev/null
+++ b/src/test/rustdoc-ui/check-doc-alias-attr-location.rs
@@ -0,0 +1,13 @@
+#![feature(doc_alias)]
+
+pub struct Bar;
+pub trait Foo {}
+
+#[doc(alias = "foo")] //~ ERROR
+extern {}
+
+#[doc(alias = "bar")] //~ ERROR
+impl Bar {}
+
+#[doc(alias = "foobar")] //~ ERROR
+impl Foo for Bar {}
diff --git a/src/test/rustdoc-ui/check-doc-alias-attr-location.stderr b/src/test/rustdoc-ui/check-doc-alias-attr-location.stderr
new file mode 100644
index 00000000000..74adc1bc073
--- /dev/null
+++ b/src/test/rustdoc-ui/check-doc-alias-attr-location.stderr
@@ -0,0 +1,20 @@
+error: `#[doc(alias = "...")]` isn't allowed on extern block
+  --> $DIR/check-doc-alias-attr-location.rs:6:7
+   |
+LL | #[doc(alias = "foo")]
+   |       ^^^^^^^^^^^^^
+
+error: `#[doc(alias = "...")]` isn't allowed on implementation block
+  --> $DIR/check-doc-alias-attr-location.rs:9:7
+   |
+LL | #[doc(alias = "bar")]
+   |       ^^^^^^^^^^^^^
+
+error: `#[doc(alias = "...")]` isn't allowed on implementation block
+  --> $DIR/check-doc-alias-attr-location.rs:12:7
+   |
+LL | #[doc(alias = "foobar")]
+   |       ^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+