Handle truncation errors (#436)

test/lang/test_bind_cache.py

@@ -29,7 +29,7 @@ class TestBind(unittest.TestCase):
         tracer = few_shot_qa_2.trace()
         print(tracer.last_node.print_graph_dfs() + "\n")
 
-    def test_pin(self):
+    def test_cache(self):
         @sgl.function
         def few_shot_qa(s, prompt, question):
             s += prompt
@@ -41,8 +41,7 @@ class TestBind(unittest.TestCase):
         few_shot_qa_2 = few_shot_qa.bind(
             prompt="Answer the following questions as if you were a 5-year-old kid.\n\n"
         )
-        few_shot_qa_2.pin(self.backend)
-        few_shot_qa_2.unpin(self.backend)
+        few_shot_qa_2.cache(self.backend)
 
 
 if __name__ == "__main__":
@@ -50,4 +49,4 @@ if __name__ == "__main__":
 
     # t = TestBind()
     # t.setUp()
-    # t.test_pin()
+    # t.test_cache()