stdout cannot be reassigned on some systems

[genotrance]

Consider:

var f: File
  
stdout = f

On Ubuntu and OSX, this works fine. In my code, I am backing up stdout and restoring it later.

However, on Windows I see:

error: lvalue required as left operand of assignment
  stdout = f__diPCTL71W7KGJSC9aB9avGTw;

On the Nim playground, I see:

error: assignment of read-only variable 'stdout'
  stdout = f_aaZ4Cbdkmq1Yxbybfr175A;

stdout is a var so it should be writable in theory.

[Araq]

Use system.reopen instead.

[genotrance]

I am using reopen for Windows but cannot recover stdout when I want it back later on in my program.

https://github.com/nimterop/nimterop/blob/master/nimterop/toast.nim#L171

Any reason why this shouldn't work consistently across OS?

[genotrance]

stdout cannot be reassigned on some systems. glibc is okay with it but it fails on Windows and musl based systems. This isn't a Nim issue.

https://stackoverflow.com/questions/1908687/how-to-redirect-the-output-back-to-the-screen-after-freopenout-txt-a-stdo