Error while compiling: futures_io::if_std::AsyncRead is not implemented for std::io::Empty

[chrisdickinson]

Hi! I was poking around the Rust async ecosystem out of curiosity, and when I tried to install surf in an empty project I got this error:

   Compiling surf v1.0.2
error[E0277]: the trait bound `std::io::Empty: futures_io::if_std::AsyncRead` is not satisfied
  --> /Users/cdickinson/.cargo/registry/src/github.com-1ecc6299db9ec823/surf-1.0.2/src/http_client/mod.rs:64:21
   |
64 |             reader: Box::new(std::io::empty()),
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `futures_io::if_std::AsyncRead` is not implemented for `std::io::Empty`
   |
   = note: required for the cast to the object type `dyn futures_io::if_std::AsyncRead + std::marker::Send + std::marker::Unpin`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `surf`.

To learn more, run the command again with --verbose.

The verbose output is here:

     Running `rustc --edition=2018 --crate-name surf /Users/cdickinson/.cargo/registry/src/github.com-1ecc6299db9ec823/surf-1.0.2/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 --cfg 'feature="curl-client"' --cfg 'feature="default"' --cfg 'feature="isahc"' --cfg 'feature="js-sys"' --cfg 'feature="middleware-logger"' --cfg 'feature="native-client"' --cfg 'feature="wasm-bindgen"' --cfg 'feature="wasm-bindgen-futures"' --cfg 'feature="wasm-client"' --cfg 'feature="web-sys"' -C metadata=1c3e514c0a858c33 -C extra-filename=-1c3e514c0a858c33 --out-dir /Users/cdickinson/projects/personal/ds/target/debug/deps -L dependency=/Users/cdickinson/projects/personal/ds/target/debug/deps --extern futures=/Users/cdickinson/projects/personal/ds/target/debug/deps/libfutures-365de1e9e66eb651.rmeta --extern http=/Users/cdickinson/projects/personal/ds/target/debug/deps/libhttp-bbece310474301d6.rmeta --extern isahc=/Users/cdickinson/projects/personal/ds/target/debug/deps/libisahc-c4452edccdc968ce.rmeta --extern log=/Users/cdickinson/projects/personal/ds/target/debug/deps/liblog-d5fa1487881b71e9.rmeta --extern mime=/Users/cdickinson/projects/personal/ds/target/debug/deps/libmime-6b951b76af8ba87e.rmeta --extern mime_guess=/Users/cdickinson/projects/personal/ds/target/debug/deps/libmime_guess-fba49381eb3931b8.rmeta --extern serde=/Users/cdickinson/projects/personal/ds/target/debug/deps/libserde-600cba9868aa7ea8.rmeta --extern serde_json=/Users/cdickinson/projects/personal/ds/target/debug/deps/libserde_json-12247f39cf48300d.rmeta --extern serde_urlencoded=/Users/cdickinson/projects/personal/ds/target/debug/deps/libserde_urlencoded-9519514955e6e3f5.rmeta --extern url=/Users/cdickinson/projects/personal/ds/target/debug/deps/liburl-691a7168f39f84f4.rmeta --cap-lints allow -L native=/Users/cdickinson/projects/personal/ds/target/debug/build/libnghttp2-sys-d38528ac152f3c05/out/i/lib`
error[E0277]: the trait bound `std::io::Empty: futures_io::if_std::AsyncRead` is not satisfied
  --> /Users/cdickinson/.cargo/registry/src/github.com-1ecc6299db9ec823/surf-1.0.2/src/http_client/mod.rs:64:21
   |
64 |             reader: Box::new(std::io::empty()),
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `futures_io::if_std::AsyncRead` is not implemented for `std::io::Empty`
   |
   = note: required for the cast to the object type `dyn futures_io::if_std::AsyncRead + std::marker::Send + std::marker::Unpin`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `surf`.

The dep is installed like so:

[dependencies]
surf = "1.0.2"

And my toolchain info is:

→ rustup toolchain list
stable-x86_64-apple-darwin
nightly-2018-12-27-x86_64-apple-darwin
nightly-x86_64-apple-darwin (default)

A quick google didn't turn up any results, so it might be that I'm just holding it wrong! Any pointers would be much appreciated – & thanks for your great work on the async ecosystem 💖

[abreis]

See issue #73, which was fixed in 29ca24a.

Until a new release of surf comes out with the fix, you can use the git master in your Cargo.toml:

surf = { git = "https://github.com/rustasync/surf" }

[awestlake87]

You can also lock futures-preview = { version "= 0.3.0-alpha.18" }. That worked for me

[marcelbuesing]

Would be great to make a new release for this fix

[yoshuawuyts]

Hi all, sorry for taking a while to respond to this. Putting out a new release today just so thing will work again on stable. Will update this issue once we do. Thanks heaps!

[yoshuawuyts]

Published 1.0.3 which fixes this problem, and compiles on std. Thanks all!