Add tracking issue number for doc alias feature

GuillaumeGomez · GuillaumeGomez · commit 48ab422be4cb · 2018-04-22T00:30:48.000+02:00
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
@@ -462,7 +462,7 @@ declare_features! (
     (active, proc_macro_non_items, "1.27.0", None, None),
 
     // #[doc(alias = "...")]
-    (active, doc_alias, "1.27.0", None, None),
+    (active, doc_alias, "1.27.0", Some(50146), None),
 );
 
 declare_features! (
diff --git a/src/test/ui/feature-gate-doc_alias.stderr b/src/test/ui/feature-gate-doc_alias.stderr
@@ -1,4 +1,4 @@
-error[E0658]: #[doc(alias = "...")] is experimental
+error[E0658]: #[doc(alias = "...")] is experimental (see issue #50146)
   --> $DIR/feature-gate-doc_alias.rs:11:1
    |
 LL | #[doc(alias = "foo")] //~ ERROR: #[doc(alias = "...")] is experimental

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-error[E0658]: #[doc(alias = "...")] is experimental`
	`1`	`+error[E0658]: #[doc(alias = "...")] is experimental (see issue #50146)`
`2`	`2`	`--> $DIR/feature-gate-doc_alias.rs:11:1`
`3`	`3`	`\|`
`4`	`4`	`LL \| #[doc(alias = "foo")] //~ ERROR: #[doc(alias = "...")] is experimental`