More tests

expression_statement.invalid.java

+class ExprStmt {
+    public int foo() {}
+    public static void main(String[] args) {
+        foo() + foo();
+    }
+}

semantic/array_out_of_bounds.java

+class ArrayOutOfBounds {
+    public static void main(String[] args) {
+        int[] x = new int[5];
+        /* This is a runtime error, the compiler shouldn't care */
+        int y = x[10];
+    }
+}

semantic/namespaces.java

+class Foo {
+    Foo Foo;
+
+    Foo Foo(Foo Foo) {
+        Foo.Foo = new Foo();
+        return Foo;
+    }
+
+    public static void main(String[] args) {
+        Foo = Foo(new Foo());
+    }
+}

semantic/new_array_access.mj

+class NewArrayAccess {
+    public static void main(String[] args) {
+        /*
+         * In Java, this is invalid, since this creates a new 2D array (which is not the type of x)
+         * In MiniJava, this is valid, because this creates a new array of size 5 and access the first element
+         */
+        int x = new int[5][1];
+    }
+}