fix #1717

Author: sumneko

changelog.md

@@ -15,9 +15,11 @@
   ```
 * `FIX` [#1698]
 * `FIX` [#1704]
+* `FIX` [#1717]
 
 [#1698]: https://github.com/sumneko/lua-language-server/issues/1698
 [#1704]: https://github.com/sumneko/lua-language-server/issues/1704
+[#1717]: https://github.com/sumneko/lua-language-server/issues/1717
 
 ## 3.6.3
 `2022-11-14`

script/core/completion/completion.lua

@@ -1235,7 +1235,13 @@ end
 ---@param src       vm.node.object
 ---@param enums     table[]
 ---@param isInArray boolean?
-local function insertEnum(state, pos, src, enums, isInArray)
+---@param mark      table?
+local function insertEnum(state, pos, src, enums, isInArray, mark)
+    mark = mark or {}
+    if mark[src] then
+        return
+    end
+    mark[src] = true
     if src.type == 'doc.type.string'
     or src.type == 'doc.type.integer'
     or src.type == 'doc.type.boolean' then
@@ -1273,7 +1279,7 @@ local function insertEnum(state, pos, src, enums, isInArray)
         }
     elseif isInArray and src.type == 'doc.type.array' then
         for i, d in ipairs(vm.getDefs(src.node)) do
-            insertEnum(state, pos, d, enums, isInArray)
+            insertEnum(state, pos, d, enums, isInArray, mark)
         end
     elseif src.type == 'global' and src.cate == 'type' then
         for _, set in ipairs(src:getSets(state.uri)) do

test/completion/common.lua

@@ -4076,3 +4076,11 @@ f {<??>}
         kind  = define.CompletionItemKind.Property,
     },
 }
+
+TEST [[
+---@alias Foo Foo[]
+---@type Foo
+local foo
+foo = {"<??>"}
+]]
+(EXISTS)