error in sgxtime, rust-sgx-sdk

gistfile1.txt

diff --git a/samplecode/hello-rust/enclave/src/lib.rs b/samplecode/hello-rust/enclave/src/lib.rs
index ed49b2a..f23800e 100644
--- a/samplecode/hello-rust/enclave/src/lib.rs
+++ b/samplecode/hello-rust/enclave/src/lib.rs
@@ -43,6 +43,9 @@ use std::vec::Vec;
 use std::io::{self, Write};
 use std::slice;
 
+use std::time::*;
+use std::untrusted::time::SystemTimeEx;
+
 #[no_mangle]
 pub extern "C" fn say_something(some_string: *const u8, some_len: usize) -> sgx_status_t {
 
@@ -63,13 +66,14 @@ pub extern "C" fn say_something(some_string: *const u8, some_len: usize) -> sgx_
     for c in word.iter() {
         hello_string.push(*c as char);
     }
-
+    let start = SystemTime::now();
     // Rust style convertion
     hello_string += String::from_utf8(word_vec).expect("Invalid UTF-8")
                                                .as_str();
+    let dc_round_duration = SystemTime::now().duration_since(start).expect("Went back in time, lol");
 
     // Ocall to normal world for output
     println!("{}", &hello_string);
     
     sgx_status_t::SGX_SUCCESS
-}
\ No newline at end of file
+}