An annotation for indicating that a function may error

It would be pretty useful to have an indicator of whether the function may error (and thus needs to be handled with pcall or the like).

---@fallible
---@param bar string
---@return string bar
local function assert_is_foobar(bar)
    if bar ~= "foobar" then
        error("bar isn't equal to foobar")
    end
    return bar
end

I'm aware of #1881 but it doesn't fullfill the same purpose as @fallible, the main difference being the fact that @noreturn indicates that the function never returns while this indicates that the function could return an error

The LSP server could also potentially show the user a warning if they don't wrap a @fallible function in a pcall call

首先检查语言服务器目前如何处理相关的 @noreturn 注解，以及如何分析 pcall 的使用情况。该 issue 没有指定文件或测试，并且预期的警告行为被描述为可选，因此在开始编码之前需要明确实现范围和完成标准。