From e8b46e34769bb1ad974f19ab214f943df8cce072 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=80=E8=90=8C=E5=B0=8F=E6=B1=90?= <sumneko@hotmail.com>
Date: Fri, 13 Jan 2023 17:05:50 +0800
Subject: fix

---
 script/vm/compiler.lua       |  2 +-
 script/vm/global.lua         |  2 +-
 test/type_inference/init.lua | 14 ++++++++++++--
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/script/vm/compiler.lua b/script/vm/compiler.lua
index 5a078e70..7a89cbf4 100644
--- a/script/vm/compiler.lua
+++ b/script/vm/compiler.lua
@@ -1270,7 +1270,7 @@ local compilerSwitch = util.switch()
             ---@cast key string
             vm.compileByParentNode(source.node, key, function (src)
                 vm.setNode(source, vm.compileNode(src))
-                if src == source and source.value then
+                if src == source and source.value and source.value.type ~= 'nil' then
                     vm.setNode(source, vm.compileNode(source.value))
                 end
             end)
diff --git a/script/vm/global.lua b/script/vm/global.lua
index 19474bb5..c1b5f320 100644
--- a/script/vm/global.lua
+++ b/script/vm/global.lua
@@ -552,7 +552,7 @@ function vm.compileByGlobal(source)
             if vm.bindDocs(source) then
                 return true
             end
-            if source.value then
+            if source.value and source.value.type ~= 'nil' then
                 vm.setNode(source, vm.compileNode(source.value))
                 return true
             end
diff --git a/test/type_inference/init.lua b/test/type_inference/init.lua
index ed29d3d1..9172ca92 100644
--- a/test/type_inference/init.lua
+++ b/test/type_inference/init.lua
@@ -3407,12 +3407,12 @@ TEST '{ [string]: number, [true]: string, [1]: boolean, tag: integer }' [[
 local <?t?>
 ]]
 
-TEST 'nil' [[
+TEST 'unknown' [[
 local mt = {}
 mt.<?x?> = nil
 ]]
 
-TEST 'nil' [[
+TEST 'unknown' [[
 mt = {}
 mt.<?x?> = nil
 ]]
@@ -4189,3 +4189,13 @@ X.Y = 1
 
 print(X.<?Y?>)
 ]]
+
+TEST 'integer' [[
+local x = {}
+
+x.y = 1
+local y = x.y
+x.y = nil
+
+print(<?y?>)
+]]
-- 
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