Add required namespace

Author: flba-eb

src/sys/socket/mod.rs

@@ -505,7 +505,7 @@ cfg_if! {
 
             /// Returns a list group identifiers (the first one being the effective GID)
             pub fn groups(&self) -> &[libc::gid_t] {
-                unsafe { slice::from_raw_parts(self.0.sc_groups.as_ptr() as *const libc::gid_t, self.0.sc_ngroups as _) }
+                unsafe { std::slice::from_raw_parts(self.0.sc_groups.as_ptr() as *const libc::gid_t, self.0.sc_ngroups as _) }
             }
         }