local uses nil at least

fix #2155

Author: sumneko

changelog.md

@@ -3,8 +3,10 @@
 ## 3.7.0
 * `NEW` support `---@type` and `--[[@as]]` for return statement
 * `FIX` wrong hover and signature for method with varargs and overloads
+* `FIX` [#2155]
 * `FIX` [#2224]
 
+[#2155]: https://github.com/LuaLS/lua-language-server/issues/2155
 [#2224]: https://github.com/LuaLS/lua-language-server/issues/2224
 
 ## 3.6.25

script/vm/compiler.lua

@@ -1112,6 +1112,12 @@ local function compileLocal(source)
         end
     end
 
+    if  source.value
+    and source.value.type == 'nil'
+    and not myNode:hasKnownType() then
+        vm.setNode(source, vm.compileNode(source.value))
+    end
+
     myNode.hasDefined = hasMarkDoc or hasMarkParam or hasMarkValue
 end
 

test/type_inference/init.lua

@@ -44,6 +44,10 @@ function TEST(wanted)
     end
 end
 
+TEST 'nil' [[
+local <?t?> = nil
+]]
+
 TEST 'string' [[
 local <?var?> = '111'
 ]]