rust-lang/rust — pull request #14989 by aturon (2014-06-17 23:46:58+00:00)
Title: std::task - Revamp TaskBuilder API

This patch consolidates and cleans up the task spawning APIs:

* Removes the problematic `future_result` method from `std::task::TaskBuilder`,
and adds a `try_future` that both spawns the task and returns a future
representing its eventual result (or failure).

* Removes the public `opts` field from `TaskBuilder`, instead adding appropriate
builder methods to configure the task.

* Adds extension traits to libgreen and libnative that add methods to
`TaskBuilder` for spawning the task as a green or native thread.

Previously, there was no way to benefit from the `TaskBuilder` functionality and
also set the scheduler to spawn within.

With this change, all task spawning scenarios are supported through the
`TaskBuilder` interface.

Closes #3725.

[breaking-change]