From f43e225845bc09ad203b13ccdd7cb40d26141164 Mon Sep 17 00:00:00 2001
From: pca006132 <jl@m-labs.hk>
Date: Mon, 28 Jun 2021 16:32:46 +0800
Subject: [PATCH] updated inference_context rules

---
 nac3core/src/typecheck/context/inference_context.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/nac3core/src/typecheck/context/inference_context.rs b/nac3core/src/typecheck/context/inference_context.rs
index 44c67b68..235f6370 100644
--- a/nac3core/src/typecheck/context/inference_context.rs
+++ b/nac3core/src/typecheck/context/inference_context.rs
@@ -64,8 +64,10 @@ impl<'a> InferenceContext<'a> {
             let (_, level) = self.stack.sym_def.last().unwrap();
             if *level > self.stack.level {
                 let (name, _) = self.stack.sym_def.pop().unwrap();
-                let (t, _, l) = self.sym_table.remove(name).unwrap();
-                poped_names.push((name, t, l));
+                let (t, b, l) = self.sym_table.get_mut(name).unwrap();
+                // set it to be unreadable
+                *b = false;
+                poped_names.push((name, t.clone(), *l));
             } else {
                 break;
             }