Initial test added for pointers to structs

Author: czgdp1807

integration_tests/structs_02.py

@@ -0,0 +1,27 @@
+from ltypes import i32, f32, dataclass, CPtr, Pointer, c_p_pointer, pointer
+
+@dataclass
+class A:
+    x: i32
+    y: f32
+
+@ccallable
+def f(a: CPtr) -> None:
+    x: i32
+    y: f32
+    a1: A
+    a2: Pointer[A]
+    a1 = A(3, 3.25)
+    a2 = pointer(a1)
+    x = a2.x
+    y = a2.y
+    assert x == 3
+    assert y == 3.25
+    c_p_pointer(a, a2)
+    print(a, a2)
+
+def g():
+    b: CPtr
+    f(b)
+
+g()