Bump tokio from 0.2.9 to 0.2.11

[dependabot-preview]

Bumps tokio from 0.2.9 to 0.2.11.

Release notes

Sourced from tokio's releases.

Tokio v0.2.11

Introduces select!, join!, and try_join! macros for waiting on multiple async operations concurrently from the same task. These macros are implemented primarily as declarative macros, which works around the recursion limit issue. The select! macro works with any type that implements Future and does not require special FusedFuture traits.

Fixes

• docs: misc fixes and tweaks (#2155, #2103, #2027, #2167, #2175).
• macros: handle generics in #[tokio::main] method (#2177).
• sync: broadcast potential lost notifications (#2135).
• rt: improve "no runtime" panic messages (#2145).

Added

• optional support for using parking_lot internally (#2164).
• fs: fs::copy, an async version of std::fs::copy (#2079).
• macros: select! waits for the first branch to complete (#2152).
• macros: join! waits for all branches to complete (#2158).
• macros: try_join! waits for all branches to complete or the first error (#2169).
• macros: pin! pins a value to the stack (#2163).
• net: ReadHalf::poll() and ReadHalf::poll_peak (#2151)
• stream: StreamExt::timeout() sets a per-item max duration (#2149).
• stream: StreamExt::fold() applies a function, producing a single value. (#2122).
• sync: impl Eq, PartialEq for oneshot::RecvError (#2168).
• task: methods for inspecting the JoinError cause (#2051).

Tokio v0.2.10

Introduces a task-local storage solution that works with Rust's "task" concept and supports multiplexing futures on the same runtime task (#2126). A number of other incremental improvements are included.

This release includes a few fixes, including fixing a scenario in which undefined behavior could be introduced when the user provided a buggy AsyncRead implementation.

Fixes

• #[tokio::main] when rt-core feature flag is not enabled (#2139).
• remove AsyncBufRead from BufStream impl block (#2108).
• potential undefined behavior when implementing AsyncRead incorrectly (#2030).

Added

• BufStream::with_capacity (#2125).
• impl From and Default for RwLock (#2089).
• io::ReadHalf::is_pair_of checks if provided WriteHalf is for the same underlying object (#1762, #2144).
• runtime::Handle::try_current() returns a handle to the current runtime (#2118).
• stream::empty() returns an immediately ready empty stream (#2092).
• stream::once(val) returns a stream that yields a single value: val (#2094).
• stream::pending() returns a stream that never becomes ready (#2092).
• StreamExt::chain() sequences a second stream after the first completes (#2093).
• StreamExt::collect() transform a stream into a collection (#2109).
• StreamExt::fuse ends the stream after the first None (#2085).
• StreamExt::merge combines two streams, yielding values as they become ready (#2091).
• Task-local storage (#2126).

... (truncated)

Commits

• 00e3c29 chore: prepare v0.2.11 release (#2179)
• bcba4aa docs: write sync mod API docs (#2175)
• 71c47fa chore: bump nightly version used in CI (#2178)
• 4996e27 macros: fix skipping generics on #[tokio::main] (#2177)
• 5bf06f2 future: provide try_join! macro (#2169)
• 12be90e stream: add StreamExt::timeout() (#2149)
• 0d49e11 sync: impl equality traits for oneshot::RecvError (#2168)
• 9eca96a rt: improve "no runtime" panic messages (#2145)
• a16c9a5 rt: test block_in_place followed by Pending (#2120)
• f0bfebb fs: add fs::copy (#2079)
• Additional commits viewable in compare view

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