diff --git a/Cargo.lock b/Cargo.lock
index f2944fe..05d766b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -121,9 +121,9 @@ checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
 [[package]]
 name = "els"
-version = "0.1.39-nightly.0"
+version = "0.1.39-nightly.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e35e675cfa42fba9067fce99587dbfc396596cd0231bb84f5fc58b8564845ff8"
+checksum = "1056f3babebc87eb323354053ff9c5c11612013c3ca5df5be7ae03a20fac886a"
 dependencies = [
  "erg_common",
  "erg_compiler",
@@ -147,9 +147,9 @@ dependencies = [
 
 [[package]]
 name = "erg_common"
-version = "0.6.27-nightly.0"
+version = "0.6.27-nightly.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ac75e02434b08efb90ff903ac462e453637043b3a6d35b306efbc83ca375ce6"
+checksum = "79163c184105f354bf4ce6593d2ce5fa563d0894cf2d1a008632e63ec3447bf4"
 dependencies = [
  "backtrace-on-stack-overflow",
  "parking_lot",
@@ -158,9 +158,9 @@ dependencies = [
 
 [[package]]
 name = "erg_compiler"
-version = "0.6.27-nightly.0"
+version = "0.6.27-nightly.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "627ed3f352f4159a859ec13f97ad945b9837dd09aa24261498674296a6ca367c"
+checksum = "f0fbb777de378216f1f0b73c1a3029e0942a56fa8377b329db9ef1de2e695b9d"
 dependencies = [
  "erg_common",
  "erg_parser",
@@ -168,9 +168,9 @@ dependencies = [
 
 [[package]]
 name = "erg_parser"
-version = "0.6.27-nightly.0"
+version = "0.6.27-nightly.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "741691700b21dda252eb47d21967e44347320520ee263529241739da165a5718"
+checksum = "a75aa981a50310dfdf49fcf074a558f36be141a166ed9ff0f7bcd1065e94491b"
 dependencies = [
  "erg_common",
  "erg_proc_macros",
@@ -179,9 +179,9 @@ dependencies = [
 
 [[package]]
 name = "erg_proc_macros"
-version = "0.6.27-nightly.0"
+version = "0.6.27-nightly.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c204aeef3905b06ecddf20812e18c43e3c4bcc10690cc3485511b8871f63922a"
+checksum = "b4c9e98a5aefa5e4ffba88f754d33abd7a532c2608083edb29134a11fc4f07bf"
 dependencies = [
  "erg_common",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index a6c0b72..d259c10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,9 +22,9 @@ edition = "2021"
 repository = "https://github.com/mtshiba/pylyzer"
 
 [workspace.dependencies]
-erg_common = { version = "0.6.27-nightly.0", features = ["py_compat", "els"] }
-erg_compiler = { version = "0.6.27-nightly.0", features = ["py_compat", "els"] }
-els = { version = "0.1.39-nightly.0", features = ["py_compat"] }
+erg_common = { version = "0.6.27-nightly.1", features = ["py_compat", "els"] }
+erg_compiler = { version = "0.6.27-nightly.1", features = ["py_compat", "els"] }
+els = { version = "0.1.39-nightly.1", features = ["py_compat"] }
 rustpython-parser = { version = "0.3.0", features = ["all-nodes-with-ranges", "location"] }
 rustpython-ast = { version = "0.3.0", features = ["all-nodes-with-ranges", "location"] }
 # rustpython-parser = { git = "https://github.com/RustPython/Parser", version = "0.3.0", features = ["all-nodes-with-ranges", "location"] }
diff --git a/tests/class.py b/tests/class.py
index 6511899..2eac46c 100644
--- a/tests/class.py
+++ b/tests/class.py
@@ -49,6 +49,8 @@ def __init__(self, c):
 class E(D):
     def __add__(self, other: E):
         return E(self.c + other.c)
+    def invalid(self):
+        return self.d # ERR: E object has no attribute `d`
 
 c1 = D(1).c + 1
 d = D(1) + D(2)
diff --git a/tests/projection.py b/tests/projection.py
index 646ee3a..925c8ab 100644
--- a/tests/projection.py
+++ b/tests/projection.py
@@ -15,3 +15,26 @@ def call_method(obj, x):
 assert call_method(c, 1) == "a" # ERR
 print(call_method(1, 1)) # ERR
 print(call_method(c)) # ERR
+
+def x_and_y(a):
+    z: int = a.y
+    return a.x + z
+
+class A:
+    x: int
+    y: int
+
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+class B:
+    x: int
+
+    def __init__(self, x):
+        self.x = x
+
+a = A(1, 2)
+assert x_and_y(a) == 3
+b = B(3)
+_ = x_and_y(b)  # ERR: B object has no attribute `y`
diff --git a/tests/test.rs b/tests/test.rs
index 5d45447..daffc2a 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -76,7 +76,7 @@ fn exec_func() -> Result<(), String> {
 
 #[test]
 fn exec_class() -> Result<(), String> {
-    expect("tests/class.py", 0, 4)
+    expect("tests/class.py", 0, 5)
 }
 
 #[test]
@@ -96,7 +96,7 @@ fn exec_typespec() -> Result<(), String> {
 
 #[test]
 fn exec_projection() -> Result<(), String> {
-    expect("tests/projection.py", 0, 4)
+    expect("tests/projection.py", 0, 5)
 }
 
 #[test]