I/O objects should be Freeze

[alexcrichton]

All of I/O uses inherited mutability, so the I/O objects themselves should be Freeze. The reason that they aren't right now is because the trait objects underneath all of them are Send, not Send + Freeze.

[lpy]

Hi! I would like to give a shot, could you please give me some guide?

[alexcrichton]

Each I/O object inside of std::io contains a trait object of the form ~RtioIoComponent, you'll need to change that to ~RtioIoComponent: Send + Freeze and then basically just deal with the fallout everywhere.

[trevorriles]

Taking a peek at this myself. Would I begin in the src/libstd/rt/rtio.rs file, changing the public trait definitions to inherit Send and Freeze?

[alexcrichton]

In theory that should also work, yes.

[alexcrichton]

Freeze was removed in #13076, and I/O objects are definitely not Share