Missing diagnostic when calling a non-function value

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Diagnostics/Syntax Checking

Expected Behaviour

LuaLS should report a diagnostic when a value whose type is known to be non-callable is called like a function.

For example, calling a number, string, boolean, or a plain table without a known __call / @overload signature should produce a warning/error, because the code will fail at runtime.

Actual Behaviour

No diagnostic is reported.

Even when the value is explicitly annotated or cast as number, LuaLS accepts the call silently.

Reproduction steps

Use the following code:

local x = 1 --[[@as number]]
x()

local y = 1
y()

---@type number
local z = 1
z()

Expected: diagnostics on x(), y(), and z().
Actual: no diagnostics are reported.
At runtime, these calls fail with an error similar to:
attempt to call a number value

Additional Notes

This is different from callable table / __call support.
I am not asking LuaLS to reject values that are explicitly annotated as callable, for example with ---@overload fun(...) or an equivalent __call signature.
The issue is about direct calls to values whose inferred or declared type is definitely not callable, such as number.
This also affects typo detection. For example, code like this can accidentally parse as a function call:

---@param name string
local function greet(name)
    return "Hello " .. name "!"
end

Here name "!" is a call expression, but name is a string, so a diagnostic would be useful.

Log File

No response

Reproduza o problema com os snippets de Lua que chamam valores numéricos e de string e, em seguida, rastreie o ponto de entrada de diagnósticos ou de verificação de tipos que trata expressões de chamada. A tarefa estará concluída quando diagnósticos forem reportados para valores definitivamente não chamáveis, enquanto tabelas chamáveis e valores com assinaturas explícitas de overload ou __call continuarem sendo aceitos.