Added test

tests/errors/class_04.py

@@ -0,0 +1,12 @@
+from lpython import i32
+
+class coord:
+    def __init__(self:"coord", x:i32, y:i32):
+        self.x: i32 = x 
+        self.y: i32 = y
+
+p1: coord = coord(1, 2)
+p2: coord = p1
+p2.x = 2
+print(p1.x)
+print(p2.x)

tests/reference/asr-class_04-b89178d.json

@@ -0,0 +1,13 @@
+{
+    "basename": "asr-class_04-b89178d",
+    "cmd": "lpython --show-asr --no-color {infile} -o {outfile}",
+    "infile": "tests/errors/class_04.py",
+    "infile_hash": "e1e1c48050cce1b2855e4f8409aa3d72df716f61b8aa045aa97ae914",
+    "outfile": null,
+    "outfile_hash": null,
+    "stdout": null,
+    "stdout_hash": null,
+    "stderr": "asr-class_04-b89178d.stderr",
+    "stderr_hash": "c31549707a144ce0bf59d5c77c59b86770648b8f0783d9c74470ec49",
+    "returncode": 2
+}

tests/reference/asr-class_04-b89178d.stderr

@@ -0,0 +1,5 @@
+semantic error: References are not implemented
+ --> tests/errors/class_04.py:9:1
+  |
+9 | p2: coord = p1
+  | ^^^^^^^^^^^^^^ 

tests/tests.toml

@@ -361,6 +361,10 @@ asr = true
 pass = "class_constructor"
 cumulative = true
 
+[[test]]
+filename = "errors/class_04.py"
+asr = true
+
 [[test]]
 filename = "../integration_tests/callback_01.py"
 asr = true