libc,rand: Add issues for all unstable features

Author: alexcrichton

src/liblibc/lib.rs

@@ -12,8 +12,9 @@
 #![cfg_attr(stage0, feature(custom_attribute))]
 #![crate_name = "libc"]
 #![crate_type = "rlib"]
-#![cfg_attr(not(feature = "cargo-build"), unstable(feature = "libc",
-                                                   reason = "use `libc` from crates.io"))]
+#![cfg_attr(not(feature = "cargo-build"),
+            unstable(feature = "libc", reason = "use `libc` from crates.io",
+                     issue = "27783"))]
 #![cfg_attr(not(feature = "cargo-build"), feature(staged_api, no_std))]
 #![cfg_attr(not(feature = "cargo-build"), staged_api)]
 #![cfg_attr(not(feature = "cargo-build"), no_std)]

src/librand/lib.rs

@@ -27,7 +27,8 @@
 #![no_std]
 #![staged_api]
 #![unstable(feature = "rand",
-            reason = "use `rand` from crates.io")]
+            reason = "use `rand` from crates.io",
+            issue = "27703")]
 #![feature(core_float)]
 #![feature(core_slice_ext)]
 #![feature(no_std)]