Issue #27985: Implement PEP 526 -- Syntax for Variable Annotations.

Patch by Ivan Levkivskyi.

Lib/lib2to3/tests/test_parser.py

@@ -237,6 +237,36 @@ class TestFunctionAnnotations(GrammarTest):
         self.validate(s)
 
 
+# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.test_var_annot
+class TestFunctionAnnotations(GrammarTest):
+    def test_1(self):
+        self.validate("var1: int = 5")
+
+    def test_2(self):
+        self.validate("var2: [int, str]")
+
+    def test_3(self):
+        self.validate("def f():\n"
+                      "    st: str = 'Hello'\n"
+                      "    a.b: int = (1, 2)\n"
+                      "    return st\n")
+
+    def test_4(self):
+        self.validate("def fbad():\n"
+                      "    x: int\n"
+                      "    print(x)\n")
+
+    def test_5(self):
+        self.validate("class C:\n"
+                      "    x: int\n"
+                      "    s: str = 'attr'\n"
+                      "    z = 2\n"
+                      "    def __init__(self, x):\n"
+                      "        self.x: int = x\n")
+
+    def test_6(self):
+        self.validate("lst: List[int] = []")
+
 class TestExcept(GrammarTest):
     def test_new(self):
         s = """