Rollup merge of rust-lang#66226 - lzutao:asm-usage-link, r=Centril

add link to unstable book for asm! macro r? @Centril
Centril · Nov 8, 2019 · 3cb884a · 3cb884a
2 parents a9d4d2b + 3db1005
commit 3cb884a
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs
@@ -1274,6 +1274,10 @@ pub(crate) mod builtin {
     }
 
     /// Inline assembly.
+    ///
+    /// Read the [unstable book] for the usage.
+    ///
+    /// [unstable book]: ../unstable-book/library-features/asm.html
     #[unstable(feature = "asm", issue = "29722",
                reason = "inline assembly is not stable enough for use and is subject to change")]
     #[rustc_builtin_macro]