Updated tests and fixed grammar

mist-test/src/items/attribute_test.mist

@@ -2,22 +2,22 @@ pub module attribute_test;
 
 #[derive(Debug)]
 pub struct Debuggable {
-    value i32,
+    i32 value,
 }
 
-pub fn void test_derive_attribute() {
+pub void test_derive_attribute() {
     let d = Debuggable { value: 42 };
     assert_eq!(d.value, 42);
 }
 
 #[allow(unused_variables)]
-pub fn void test_allow_attribute() {
+pub void test_allow_attribute() {
     let x = 42;
     let y = "unused";
     assert_eq!(x, 42);
 }
 
-pub fn void run_tests() {
+pub void run_tests() {
     test_derive_attribute();
     test_allow_attribute();
 }