Issue 3223: make unsafe scopes tighter

src/atom_table.rs

@@ -386,8 +386,6 @@ impl Atom {
 unsafe fn write_to_ptr(string: &str, ptr: *mut u8) {
     unsafe {
         ptr::write(ptr as *mut _, AtomHeader::build_with(string.len() as u64));
-    }
-    unsafe {
         let str_ptr = ptr.add(mem::size_of::<AtomHeader>());
         ptr::copy_nonoverlapping(string.as_ptr(), str_ptr, string.len());
     }