2 files changed, 3 insertions, 0 deletions
diff --git a/src/libstd/sys_common/mod.rs b/src/libstd/sys_common/mod.rs
index e57bb267cbd..c3e6a5570e6 100644
--- a/src/libstd/sys_common/mod.rs
+++ b/src/libstd/sys_common/mod.rs
@@ -57,6 +57,7 @@ pub mod mutex;
           target_os = "cloudabi",
           target_os = "hermit",
           target_arch = "wasm32",
+          feature = "restricted-std",
           all(target_vendor = "fortanix", target_env = "sgx")))]
 pub mod os_str_bytes;
 pub mod poison;
@@ -74,6 +75,7 @@ cfg_if::cfg_if! {
     if #[cfg(any(target_os = "cloudabi",
                  target_os = "l4re",
                  target_os = "hermit",
+                 feature = "restricted-std",
                  all(target_arch = "wasm32", not(target_os = "emscripten")),
                  all(target_vendor = "fortanix", target_env = "sgx")))] {
         pub use crate::sys::net;
diff --git a/src/libstd/sys_common/mutex.rs b/src/libstd/sys_common/mutex.rs
index 899fc6a7235..e66d8994147 100644
--- a/src/libstd/sys_common/mutex.rs
+++ b/src/libstd/sys_common/mutex.rs
@@ -17,6 +17,7 @@ impl Mutex {
     /// Also, until `init` is called, behavior is undefined if this
     /// mutex is ever used reentrantly, i.e., `raw_lock` or `try_lock`
     /// are called by the thread currently holding the lock.
+    #[rustc_const_stable(feature = "const_sys_mutex_new", since = "1.0.0")]
     pub const fn new() -> Mutex {
         Mutex(imp::Mutex::new())
     }