Nothing + string literal should not result in string literal but in a string type (because we don't know how the string literal could have looked like

test/completion/precedence.py

@@ -108,3 +108,12 @@ b[1]
 z = sorted([1], key = lambda x : x):
 #? int()
 z[0]
+
+
+# -----------------
+# undefined names
+# -----------------
+a = foobarbaz + 'hello'
+
+#? int() float()
+{'hello': 1, 'bar': 1.0}[a]