From 40e0d3595961913aff0405369ddc9cbec2f743d1 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: Tue, 26 Oct 2021 17:12:27 +0800
Subject: fix #753

---
 changelog.md                 | 1 +
 script/core/hover/return.lua | 7 +++++++
 script/core/infer.lua        | 1 -
 test/hover/init.lua          | 9 +++++++++
 4 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/changelog.md b/changelog.md
index 41f7ea35..b9240098 100644
--- a/changelog.md
+++ b/changelog.md
@@ -6,6 +6,7 @@
 * `FIX` [#748](https://github.com/sumneko/lua-language-server/issues/748)
 * `FIX` [#749](https://github.com/sumneko/lua-language-server/issues/749)
 * `FIX` [#752](https://github.com/sumneko/lua-language-server/issues/752)
+* `FIX` [#753](https://github.com/sumneko/lua-language-server/issues/753)
 * `FIX` [#756](https://github.com/sumneko/lua-language-server/issues/756)
 * `FIX` [#758](https://github.com/sumneko/lua-language-server/issues/758)
 
diff --git a/script/core/hover/return.lua b/script/core/hover/return.lua
index 0f0d85e0..49f9536a 100644
--- a/script/core/hover/return.lua
+++ b/script/core/hover/return.lua
@@ -54,6 +54,13 @@ local function asFunction(source)
             line[#line+1] = ('% 3d. '):format(i)
         end
         for n = 1, #rtn do
+            if rtn[n].type == 'doc.type' then
+                for _, typeUnit in ipairs(rtn[n].types) do
+                    if typeUnit[1] == 'nil' then
+                        infers['nil'] = true
+                    end
+                end
+            end
             local values = infer.searchInfers(rtn[n])
             for tp in pairs(values) do
                 infers[tp] = true
diff --git a/script/core/infer.lua b/script/core/infer.lua
index ab297209..6e667e65 100644
--- a/script/core/infer.lua
+++ b/script/core/infer.lua
@@ -216,7 +216,6 @@ local function searchLiteralOfValue(value, literals, mark)
             end
         end
     end
-    return
 end
 
 local function bindClassOrType(source)
diff --git a/test/hover/init.lua b/test/hover/init.lua
index 0a05e1cc..36fbd6d2 100644
--- a/test/hover/init.lua
+++ b/test/hover/init.lua
@@ -1714,3 +1714,12 @@ local t: A<string, number> {
     y: number,
 }
 ]]
+
+TEST [[
+---@return nil
+local function <?f?>() end
+]]
+[[
+function f()
+  -> nil
+]]
-- 
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