From e4ee172ab05b03bf71e0d89e0042a89ff26a3c29 Mon Sep 17 00:00:00 2001
From: unexge <unexge@gmail.com>
Date: Sat, 2 May 2020 21:14:08 +0300
Subject: Add long error explanation for E0539

---
 src/librustc_error_codes/error_codes/E0539.md | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/librustc_error_codes/error_codes/E0539.md

(limited to 'src/librustc_error_codes/error_codes')

diff --git a/src/librustc_error_codes/error_codes/E0539.md b/src/librustc_error_codes/error_codes/E0539.md
new file mode 100644
index 00000000000..69555453514
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0539.md
@@ -0,0 +1,42 @@
+An invalid meta-item was used inside an attribute.
+
+Erroneous code example:
+
+```compile_fail,E0539
+#[rustc_deprecated(reason)] // error!
+#[unstable(feature = "deprecated_fn", issue = "123")]
+fn deprecated() {}
+
+#[unstable(feature = "unstable_struct", issue)] // error!
+struct Unstable;
+
+#[rustc_const_unstable(feature)] // error!
+const fn unstable_fn() {}
+
+#[stable(feature = "stable_struct", since)] // error!
+struct Stable;
+
+#[rustc_const_stable(feature)] // error!
+const fn stable_fn() {}
+```
+
+Meta items are the key-value pairs inside of an attribute.
+To fix these issues you need to give required key-value pairs.
+
+```
+#[rustc_deprecated(since = "1.39.0", reason = "reason")] // ok!
+#[unstable(feature = "deprecated_fn", issue = "123")]
+fn deprecated() {}
+
+#[unstable(feature = "unstable_struct", issue = "123")] // ok!
+struct Unstable;
+
+#[rustc_const_unstable(feature = "unstable_fn", issue = "124")] // ok!
+const fn unstable_fn() {}
+
+#[stable(feature = "stable_struct", since = "1.39.0")] // ok!
+struct Stable;
+
+#[rustc_const_stable(feature = "stable_fn", since = "1.39.0")] // ok!
+const fn stable_fn() {}
+```
-- 
cgit 1.4.1-3-g733a5