fix: return single definition for anonymous-function field assignment

Author: tomlau10

changelog.md

@@ -3,6 +3,7 @@
 ## Unreleased
 <!-- Add all new changes here. They will be moved under a version at release -->
 * `FIX` `need-check-nil` diagnostic is no longer reported on safe navigation access (e.g. `x?.field`, `f?.()`, `t?.[key]`), since the optional access itself already handles the nil check. Note that a non-safe access chained after a safe one (e.g. `x.upper()?.field`) still reports, because the safe access only protects its own result.
+* `FIX` Go to definition on a table field assigned an anonymous function (e.g. `A.c = function() end`) now returns a single definition at the field name, instead of two candidates (the field name and the function value) [#2451](https://github.com/LuaLS/lua-language-server/issues/2451)
 
 ## 3.19.1
 `2026-08-14`

script/core/definition.lua

@@ -231,6 +231,25 @@ return function (uri, offset)
         return nil
     end
 
+    -- Drop a redundant function-value target when the owning assignment's name node is also a target.
+    -- Collapses `A.c = function() end` to a single definition at the name `c`.
+    local targetMark = {}
+    for _, res in ipairs(results) do
+        targetMark[res.target] = true
+    end
+    for i = #results, 1, -1 do
+        local target = results[i].target
+        if target.type == 'function' then
+            local parent = target.parent
+            if parent and guide.isAssign(parent) then
+                local owner = parent.field or parent.method or parent.index or parent.variable or parent
+                if targetMark[owner] then
+                    table.remove(results, i)
+                end
+            end
+        end
+    end
+
     sortResults(results)
     jumpSource(results)
 

test/definition/field.lua

@@ -21,3 +21,15 @@ local t = X
 
 print(t.x.<?y?>)
 ]]
+
+TEST [[
+A = {}
+A.<!c!> = function() end
+A.<?c?>()
+]]
+
+TEST [[
+local A = {}
+A.<!c!> = function() end
+A.<?c?>()
+]]

test/definition/function.lua

@@ -24,6 +24,6 @@ end
 ]]
 
 TEST [[
-local <!f!> = <!function () end!>
+local <!f!> = function () end
 <?f?>()
 ]]