Fix typo in exception thrown by ast.unparse (GH-19534)

hauntsaninja · web-flow · commit 01508dcde47a · 2020-04-16T11:10:12.000+01:00
diff --git a/Lib/ast.py b/Lib/ast.py
@@ -1149,7 +1149,7 @@ def visit_IfExp(self, node):
 
     def visit_Set(self, node):
         if not node.elts:
-            raise ValueError("Set node should has at least one item")
+            raise ValueError("Set node should have at least one item")
         with self.delimit("{", "}"):
             self.interleave(lambda: self.write(", "), self.traverse, node.elts)
 
