Missing diagnostic when calling a non-function value

Tái hiện vấn đề bằng các snippet Lua gọi các giá trị số và chuỗi, sau đó lần theo điểm vào của chẩn đoán hoặc kiểm tra kiểu xử lý các biểu thức gọi. Hoàn thành khi các chẩn đoán được báo cáo cho những giá trị chắc chắn không thể gọi, trong khi các bảng có thể gọi và các giá trị có chữ ký overload hoặc __call rõ ràng vẫn được chấp nhận.

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.

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