@nodiscard don't check all return values [BUG] or [enhancement]

[sadSader]

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Annotations, Type Checking

Expected Behaviour

There is a lot of functions which return errors as second return value (example: io.open, file:write()) but nondiscard don't check that all return values not discarded

1. nodiscard show warning when any of return values is ignored
   or
2. Option to mark each return value as non-discardable

Actual Behaviour

Reproduction steps

local f = io.open() -- should be message that errmsg can't be discarded

Additional Notes

No response

Log File

No response

[sumneko]

I think the current situation is reasonable. Taking io.open as an example, if you don't receive its return value, calling this function will be meaningless. However, I can choose not to care about its error message, so I can choose not to receive the second return value.
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