need-check-nil check t[x]

Author: sumneko

script/core/diagnostics/need-check-nil.lua

@@ -24,6 +24,10 @@ return function (uri, callback)
         if call and call.type == 'call' and call.node == src then
             checkNil = true
         end
+        local setIndex = src.parent
+        if setIndex and setIndex.type == 'setindex' and setIndex.index == src then
+            checkNil = true
+        end
         if not checkNil then
             return
         end

test/diagnostics/common.lua

@@ -1560,6 +1560,14 @@ local x
 S = <!x!>()
 ]]
 
+TEST [[
+---@type integer?
+local x
+
+T = {}
+T[<!x!>] = 1
+]]
+
 TEST [[
 local x, y
 local z = x and y