[INFO] crate merge-io 0.1.2 is already in cache
[INFO] testing merge-io-0.1.2 against 1.38.0 for beta-1.39-1
[INFO] extracting crate merge-io 0.1.2 into work/builds/worker-1/source
[INFO] validating manifest of crates.io crate merge-io 0.1.2 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate merge-io 0.1.2
[INFO] finished tweaking crates.io crate merge-io 0.1.2
[INFO] tweaked toml for crates.io crate merge-io 0.1.2 written to work/builds/worker-1/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] cbbedce270b377e3402e13e3af935c5a186fa05fbc6f95943f7c3d84eb1bd221
[INFO] running `"docker" "start" "-a" "cbbedce270b377e3402e13e3af935c5a186fa05fbc6f95943f7c3d84eb1bd221"`
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling merge-io v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `futures::io::Initializer`
[INFO] [stderr]   --> src/lib.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | use futures::io::Initializer;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^ no `Initializer` in `io`
[INFO] [stderr] 
[INFO] [stderr] error[E0407]: method `initializer` is not a member of trait `AsyncRead`
[INFO] [stderr]    --> src/lib.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 105 | /     unsafe fn initializer(&self) -> Initializer {
[INFO] [stderr] 106 | |         self.reader.initializer()
[INFO] [stderr] 107 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `AsyncRead`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `initializer` found for type `R` in the current scope
[INFO] [stderr]    --> src/lib.rs:106:21
[INFO] [stderr]     |
[INFO] [stderr] 106 |         self.reader.initializer()
[INFO] [stderr]     |                     ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the type parameter is bounded by the trait
[INFO] [stderr] help: the following trait defines an item `initializer`, perhaps you need to restrict type parameter `R` with it:
[INFO] [stderr]     |
[INFO] [stderr] 99  | impl<R: std::io::Read, W> AsyncRead for MergeIO<R, W>
[INFO] [stderr]     |      ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0407, E0432, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0407`.
[INFO] [stderr] error: Could not compile `merge-io`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cbbedce270b377e3402e13e3af935c5a186fa05fbc6f95943f7c3d84eb1bd221"`
[INFO] running `"docker" "rm" "-f" "cbbedce270b377e3402e13e3af935c5a186fa05fbc6f95943f7c3d84eb1bd221"`
[INFO] [stdout] cbbedce270b377e3402e13e3af935c5a186fa05fbc6f95943f7c3d84eb1bd221