Fix MSRV build and tests

contrib/test.sh

@@ -2,14 +2,15 @@
 
 set -ex
 
-FEATURES="serde rand zeroize all-languages chinese-simplified chinese-traditional czech french italian japanese korean portuguese spanish"
+FEATURES="serde rand all-languages chinese-simplified chinese-traditional czech french italian japanese korean portuguese spanish"
 
 cargo --version
 rustc --version
 
 # Pin dependencies as required if we are using MSRV toolchain.
-# if cargo --version | grep "1\.41"; then
+if cargo --version | grep "1\.41"; then
-# fi
+    cargo update --package "bitcoin_hashes" --precise "0.12.0"
+fi
 
 echo "********* Testing std *************"
 # Test without any features other than std first
@@ -19,6 +20,16 @@ echo "********* Testing default *************"
 # Then test with the default features
 cargo test --verbose
 
+# Build specific features
+for feature in ${FEATURES}
+do
+    cargo build --verbose --features="$feature" --no-default-features
+done
+
+if cargo --version | grep -v "1\.41"; then
+    cargo build --verbose --features="zeroize" --no-default-features
+fi
+
 if [ "$DO_NO_STD" = true ]
 then
     echo "********* Testing no-std build *************"
@@ -38,6 +49,10 @@ then
     do
         cargo build --verbose --features="$feature" --no-default-features
     done
+
+    if cargo --version | grep -v "1\.41"; then
+        cargo build --verbose --features="zeroize" --no-default-features
+    fi
 fi
 
 # Test each feature

src/language/mod.rs

@@ -337,10 +337,10 @@ mod tests {
 			Language::Korean,
 		];
 
-		for lang in languages {
+		for lang in languages.iter() {
 			let mut list = lang.word_list().to_vec();
 			list.sort();
-			assert_eq!(list, lang.word_list());
+			assert_eq!(&list[..], &lang.word_list()[..]);
 		}
 	}
 

src/lib.rs

@@ -899,7 +899,7 @@ mod tests {
 				);
 				assert_eq!(&entropy, &mnemonic.to_entropy(), "failed vector: {}", mnemonic_str);
 				assert_eq!(
-					&entropy,
+					&entropy[..],
 					&mnemonic.to_entropy_array().0[0..entropy.len()],
 					"failed vector: {}",
 					mnemonic_str