diff --git a/crates/aiken-lang/src/format.rs b/crates/aiken-lang/src/format.rs
index 7134c184..09ae5b2d 100644
--- a/crates/aiken-lang/src/format.rs
+++ b/crates/aiken-lang/src/format.rs
@@ -171,7 +171,7 @@ impl<'comments> Formatter<'comments> {
             line(),
         );
 
-        let declarations = join(declarations.into_iter(), lines(2));
+        let declarations = join(declarations, lines(2));
 
         let sep = if has_imports && has_declarations {
             lines(2)
diff --git a/crates/aiken-lang/src/tests/check.rs b/crates/aiken-lang/src/tests/check.rs
index 8b13fe33..35825c39 100644
--- a/crates/aiken-lang/src/tests/check.rs
+++ b/crates/aiken-lang/src/tests/check.rs
@@ -331,7 +331,7 @@ fn exhaustiveness_expect() {
         }
     "#;
 
-    assert!(matches!(check(parse(source_code)), Ok(_)))
+    assert!(check(parse(source_code)).is_ok())
 }
 
 #[test]
@@ -607,7 +607,7 @@ fn exhaustiveness_nested_list_and_tuples() {
         }
     "#;
 
-    assert!(matches!(check(parse(source_code)), Ok(_)))
+    assert!(check(parse(source_code)).is_ok())
 }
 
 #[test]
@@ -643,7 +643,7 @@ fn expect_sugar_correct_type() {
         }
     "#;
 
-    assert!(matches!(check(parse(source_code)), Ok(_)))
+    assert!(check(parse(source_code)).is_ok())
 }
 
 #[test]