infer types of tableindex by semantic

fix #1831

changelog.md

@@ -1,5 +1,9 @@
 # changelog
 
+## 3.6.8
+* `FIX` [#1831]
+[#1831]: https://github.com/sumneko/lua-language-server/issues/1831
+
 ## 3.6.7
 `2023-1-20`
 * `FIX` [#1810]

script/vm/compiler.lua

@@ -1325,6 +1325,18 @@ local compilerSwitch = util.switch()
             end
         end
 
+        if not hasMarkDoc and source.type == 'tableindex' then
+            vm.compileByParentNode(source.node, vm.ANY, function (src)
+                if src.type == 'doc.field'
+                or src.type == 'doc.type.field' then
+                    if vm.isSubType(guide.getUri(source), vm.compileNode(source.index), vm.compileNode(src.field or src.name)) then
+                        hasMarkDoc = true
+                        vm.setNode(source, vm.compileNode(src))
+                    end
+                end
+            end)
+        end
+
         if not hasMarkDoc and source.value then
             vm.setNode(source, vm.compileNode(source.value))
         end

test/diagnostics/type-check.lua

@@ -1117,6 +1117,17 @@ local B = "World"
 local x = A
 ]]
 
+TEST [[
+local enum = { a = 1, b = 2 }
+
+---@type { [integer] : boolean }
+local t = {
+    <![enum.a]!> = 1,
+    <![enum.b]!> = 2,
+    <![3]!> = 3,
+}
+]]
+
 config.remove(nil, 'Lua.diagnostics.disable', 'unused-local')
 config.remove(nil, 'Lua.diagnostics.disable', 'unused-function')
 config.remove(nil, 'Lua.diagnostics.disable', 'undefined-global')