feat: skip warning when instance variable overriding class function

Author: tomlau10

script/core/diagnostics/duplicate-set-field.lua

@@ -68,6 +68,12 @@ return function (uri, callback)
             if not defValue or defValue.type ~= 'function' then
                 goto CONTINUE
             end
+            if vm.getDefinedClass(guide.getUri(def), def.node)
+            and not vm.getDefinedClass(guide.getUri(src), src.node)
+            then
+                -- allow type variable to override function defined in class variable
+                goto CONTINUE
+            end
             callback {
                 start   = src.start,
                 finish  = src.finish,

test/diagnostics/duplicate-set-field.lua

@@ -72,3 +72,29 @@ else
     function X.f() end
 end
 ]]
+
+TEST [[
+---@class A
+X = {}
+
+function X:f() end
+
+---@type x
+local x
+
+function x:f() end
+]]
+
+TEST [[
+---@class A
+X = {}
+
+function X:f() end
+
+---@type x
+local x
+
+function <!x:f!>() end
+
+function <!x:f!>() end
+]]