Added more tests

src/core/Evaluate.go

@@ -41,5 +41,6 @@ func (f *Function) Evaluate(expr *expression.Expression) (eval.Value, error) {
 		Register: tmp,
 	}
 
+	f.FreeRegister(tmp)
 	return value, err
 }

tests/programs/struct.q

@@ -4,31 +4,53 @@ struct Point {
 }
 
 main() {
-	p := new(Point)
-	assert p.x == 0
-	assert p.y == 0
-	assert p.x == p.y
+	a := new(Point)
+	assert a.x == 0
+	assert a.y == 0
+	assert a.x == a.y
 
-	p.x = 1
-	p.y = 2
-	assert p.x == 1
-	assert p.y == 2
-	assert p.x != p.y
+	a.x = 1
+	a.y = 2
+	assert a.x == 1
+	assert a.y == 2
+	assert a.x != a.y
 
-	p.x = p.y
-	assert p.x == 2
-	assert p.y == 2
-	assert p.x == p.y
+	a.x = a.y
+	assert a.x == 2
+	assert a.y == 2
+	assert a.x == a.y
 
-	p.x = p.y + 1
-	assert p.x == 3
-	assert p.y == 2
-	assert p.x != p.y
+	a.x = a.y + 1
+	assert a.x == 3
+	assert a.y == 2
+	assert a.x != a.y
 
-	p.y = p.x
-	assert p.x == 3
-	assert p.y == 3
-	assert p.x == p.y
+	a.y += 1
+	assert a.x == 3
+	assert a.y == 3
+	assert a.x == a.y
 
-	delete(p)
+	b := new(Point)
+	assert b.x == 0
+	assert b.y == 0
+
+	b.x = -3
+	b.y = -3
+	assert b.x == -3
+	assert b.y == -3
+
+	c := new(Point)
+	assert c.x == 0
+	assert c.y == 0
+
+	c.x = a.x + b.x
+	c.y = a.y + b.y
+	assert c.x == a.x + b.x
+	assert c.y == a.y + b.y
+	assert c.x == 0
+	assert c.y == 0
+
+	delete(a)
+	delete(b)
+	delete(c)
 }