conflict with system.commandline

In F#, I see regular issues where the compiler is trying to use System.CommandLine.

When you do 'open CommandLine', you get this warning:

`This declaration opens the namespace or module 'System.CommandLine' through a partially qualified path. Adjust this code to use the full path of the namespace. This change will make your code more robust as new constructs are added to the F# and CLI libraries.`

This means that you cannot open the System lib in the same file and this is annoying because it is pretty much the most commonly included lib in the whole dotnet ecosystem.

該 issue 沒有指定原始檔案或測試；先使用 F# 範例 `open CommandLine` 重現警告，並檢查專案的 F# 支援入口點。當 namespace 衝突不再產生此警告，且仍可存取 System 程式庫時，即表示完成。

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