diff --git a/rust/common/src/packed_func.rs b/rust/common/src/packed_func.rs
index d9399492264b..8fa732e1a4ea 100644
--- a/rust/common/src/packed_func.rs
+++ b/rust/common/src/packed_func.rs
@@ -166,6 +166,10 @@ TVMPODValue! {
     /// # Example
     ///
     /// ```
+    /// # use std::convert::TryFrom;
+    /// # use std::convert::TryInto;
+    /// # use self::tvm_common::TVMRetValue;
+    ///
     /// let a = 42u32;
     /// let b: i64 = TVMRetValue::from(a).try_into().unwrap();
     ///
@@ -335,6 +339,12 @@ impl From<String> for TVMRetValue {
     }
 }
 
+impl From<&str> for TVMRetValue {
+    fn from(s: &str) -> Self {
+        Self::from(s.to_string())
+    }
+}
+
 impl From<TVMByteArray> for TVMRetValue {
     fn from(arr: TVMByteArray) -> Self {
         Self::Bytes(arr)
diff --git a/rust/common/src/value.rs b/rust/common/src/value.rs
index 6d17db207865..4b991b6d9a98 100644
--- a/rust/common/src/value.rs
+++ b/rust/common/src/value.rs
@@ -162,6 +162,8 @@ impl_tvm_context!(
 /// ## Example
 ///
 /// ```
+/// # use self::tvm_common::TVMByteArray;
+///
 /// let v = b"hello";
 /// let barr = TVMByteArray::from(&v);
 /// assert_eq!(barr.len(), v.len());