From e776e2a13d6b713b4799e60312b8756c00fa1f41 Mon Sep 17 00:00:00 2001
From: Dave Halter <davidhalter88@gmail.com>
Date: Wed, 26 Jul 2017 23:08:36 +0200
Subject: [PATCH] Add issues if users want to assign to operators.

---
 parso/python/normalizer.py | 11 +++++++++++
 test/test_python_errors.py |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/parso/python/normalizer.py b/parso/python/normalizer.py
index 2cd57d2..8af4dfb 100644
--- a/parso/python/normalizer.py
+++ b/parso/python/normalizer.py
@@ -473,6 +473,17 @@ class ErrorFinder(Normalizer):
             self._add_syntax_error(message, node)
         elif type_ == 'test':
             error = 'conditional expression'
+        elif type_ == 'atom_expr':
+            if node.children[0] == 'await':
+                error = 'await expression'
+        elif type_ in ('testlist_star_expr', 'exprlist'):
+            for child in node.children[::2]:
+                self._check_assignment(child, is_deletion)
+        elif ('expr' in type_ and type_ != 'star_expr' # is a substring
+              or '_test' in type_
+              or type_ in ('term', 'factor')):
+            error = 'operator'
+
         print(node)
 
         if error is not None:
diff --git a/test/test_python_errors.py b/test/test_python_errors.py
index dbd8b92..dd44307 100644
--- a/test/test_python_errors.py
+++ b/test/test_python_errors.py
@@ -115,11 +115,17 @@ def test_indentation_errors(code, positions):
         'b"" = 1',
         'b"" = 1',
         '"" "" = 1',
+        '1 | 1 = 3',
+        '~ 1 = 3',
+        'not 1 = 3',
+        '1 and 1 = 3',
         'def foo(): (yield 1) = 3',
         'def foo(): x = yield 1 = 3',
+        'async def foo(): await x = 3',
         '(a if a else a) = a',
         '(True,) = x',
         '([False], a) = x',
+        'a, 1 = x',
 
         # SyntaxErrors from Python/symtable.c
         'def f(x, x): pass',