Tracking issue for fs::DirBuilder

[alexcrichton]

This is a tracking issue for the unstable dir_builder feature in the standard library. The current purpose of this is to provide access to platform-specific options such as modes on Unix or security attributes on Windows. The current create_dir and create_dir_all APIs are built on top of this API right now.

There aren't too many open questions other than bikeshedding things like naming and such. C++ may have some inspiration as well for an API like this.

[aturon]

Nominating for stabilization in 1.6.

[retep998]

I'm okay with the current design with those three functions. Hopefully we can get some platform specific extension traits soon though.

[alexcrichton]

🔔 This issue is now entering its cycle-long final comment period for stabilization 🔔

[alexcrichton]

The libs team discussed this during triage today and the decision was to stabilize