Basic implementation support for namedexpr, fixes #1647

test/completion/flow_analysis.py

@@ -5,7 +5,7 @@
 x = 3
 if NOT_DEFINED:
     x = ''
-#? 6 int()
+#? 6 int() str()
 elif x:
     pass
 else:

test/completion/named_expression.py

@@ -1,3 +1,6 @@
+# For assignment expressions / named expressions / walrus operators / whatever
+# they are called.
+
 # python >= 3.8
 b = (a:=1, a)
 
@@ -11,3 +14,39 @@ b = ('':=1,)
 
 #? int()
 b[0]
+
+def test_assignments():
+    match = ''
+    #? str()
+    match
+    #? 8 int()
+    if match := 1:
+        #? int()
+        match
+    #? int()
+    match
+
+def test_assignments2():
+    class Foo:
+        match = ''
+    #? str()
+    Foo.match
+    #? 13 int()
+    if Foo.match := 1:
+        #? str()
+        Foo.match
+    #? str()
+    Foo.match
+
+    #?
+    y
+    #? 16 str()
+    if y := Foo.match:
+        #? str()
+        y
+    #? str()
+    y
+
+    #? 8 str()
+    if z := Foo.match:
+        pass