fix can not union unknown with other types

Author: sumneko

changelog.md

@@ -1,5 +1,8 @@
 # changelog
 
+## 3.2.4
+* `FIX` hover: can not union `unknown` with other types
+
 ## 3.2.3
 `2022-5-16`
 * `CHG` parse `.luarc.json` as jsonc. In order to please the editor, it also supports `.luarc.jsonc` as the file name.

script/vm/infer.lua

@@ -76,7 +76,9 @@ local viewNodeSwitch = util.switch()
     : case 'global'
     : call(function (source, infer)
         if source.cate == 'type' then
-            infer._hasClass = true
+            if source.name ~= 'unknown' then
+                infer._hasClass = true
+            end
             if source.name == 'number' then
                 infer._hasNumber = true
             end

test/type_inference/init.lua

@@ -2297,3 +2297,14 @@ end
 
 print(<?t?>)
 ]]
+
+TEST 'table|unknown' [[
+local function f()
+    if x then
+        return y
+    end
+    return {}
+end
+
+local <?z?> = f()
+]]