CI fixes for MSRV and benches

Author: sanket1729

contrib/test.sh

@@ -7,23 +7,19 @@ FEATURES="compiler serde rand base64"
 cargo --version
 rustc --version
 
+# Pin dependencies required to build with Rust 1.41.1
+if cargo --version | grep "1\.41\.0"; then
+    cargo update -p serde --precise 1.0.156
+    cargo update -p syn --precise 1.0.107
+fi
+
 # Format if told to
 if [ "$DO_FMT" = true ]
 then
     rustup component add rustfmt
     cargo fmt -- --check
 fi
 
-# Pin dependencies required to build with Rust 1.41.1
-if cargo --version | grep "1\.41\.0"; then
-    cargo update -p once_cell --precise 1.13.1
-fi
-
-# Pin dependencies required to build with Rust 1.47.0
-if cargo --version | grep "1\.47\.0"; then
-    cargo update -p once_cell --precise 1.13.1
-fi
-
 # Fuzz if told to
 if [ "$DO_FUZZ" = true ]
 then

src/lib.rs

@@ -88,6 +88,9 @@
 //! ```
 //!
 //!
+
+#![cfg_attr(all(test, feature = "unstable"), feature(test))]
+// Coding conventions
 #![allow(bare_trait_objects)]
 #![deny(non_camel_case_types)]
 #![deny(non_snake_case)]