Another endless while loop issue, add an assert.

test/test_parser/test_diff_parser.py

@@ -463,3 +463,37 @@ def test_in_class_movements(differ):
 
     differ.initialize(code1)
     differ.parse(code2, parsers=2, copies=1)
+
+
+def test_in_parentheses_newlines(differ):
+    code1 = dedent("""
+    x = str(
+        True)
+
+    a = 1
+
+    def foo():
+        pass
+
+    b = 2""")
+
+    code2 = dedent("""
+    x = str(True)
+
+    a = 1
+
+    def foo():
+        pass
+
+    b = 2""")
+
+
+    script = jedi.Script(code1, line=2, column=8)
+    assert script.call_signatures()
+    script = jedi.Script(code2, line=2, column=9)
+    assert script.call_signatures()
+    script = jedi.Script(code1, line=2, column=8)
+    assert script.call_signatures()
+    differ.initialize(code1)
+    differ.parse(code2, parsers=1, copies=1)
+    differ.parse(code1, parsers=1, copies=1)