[INFO] fetching crate thread_io 0.3.0...
[INFO] checking thread_io-0.3.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate thread_io 0.3.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate thread_io 0.3.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate thread_io 0.3.0
[INFO] finished tweaking crates.io crate thread_io 0.3.0
[INFO] tweaked toml for crates.io crate thread_io 0.3.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 111e576ca8cc2b921166179b62ff07313ccd00a9baa53f7eb8431811f705e656
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "111e576ca8cc2b921166179b62ff07313ccd00a9baa53f7eb8431811f705e656", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "111e576ca8cc2b921166179b62ff07313ccd00a9baa53f7eb8431811f705e656", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "111e576ca8cc2b921166179b62ff07313ccd00a9baa53f7eb8431811f705e656", kill_on_drop: false }`
[INFO] [stdout] 111e576ca8cc2b921166179b62ff07313ccd00a9baa53f7eb8431811f705e656
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de7a41096528d7c50d4f4c1d528a20d27960470fd1e42dc6e9ea7fb906298f2a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "de7a41096528d7c50d4f4c1d528a20d27960470fd1e42dc6e9ea7fb906298f2a", kill_on_drop: false }`
[INFO] [stderr]     Checking thread_io v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/reader.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/writer.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thread_io` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/read.rs:104:32
[INFO] [stdout]     |
[INFO] [stdout] 104 |   ...   panic!(format!(
[INFO] [stdout]     |  ______________^
[INFO] [stdout] 105 | | ...       "left != right at channel bufsize: {}, reader bufsize: {}, final reader bufsize {}, queue length: {}\nleft:  {:?}\nright: {:?}",
[INFO] [stdout] 106 | | ...       channel_bufsize, rdr_block_size, out_bufsize, queuelen, &out, &text[..]
[INFO] [stdout] 107 | | ...   ));
[INFO] [stdout]     | |_______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 104 |                         panic!(
[INFO] [stdout] 105 |                             "left != right at channel bufsize: {}, reader bufsize: {}, final reader bufsize {}, queue length: {}\nleft:  {:?}\nright: {:?}",
[INFO] [stdout] 106 |                             channel_bufsize, rdr_block_size, out_bufsize, queuelen, &out, &text[..]
[INFO] [stdout] 107 |                         );
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/read.rs:138:24
[INFO] [stdout]     |
[INFO] [stdout] 138 |                   panic!(format!(
[INFO] [stdout]     |  ________________________^
[INFO] [stdout] 139 | |                     "read should fail at bufsize: {}, queue length: {}",
[INFO] [stdout] 140 | |                     channel_bufsize, queuelen
[INFO] [stdout] 141 | |                 ));
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 138 |                 panic!(
[INFO] [stdout] 139 |                     "read should fail at bufsize: {}, queue length: {}",
[INFO] [stdout] 140 |                     channel_bufsize, queuelen
[INFO] [stdout] 141 |                 );
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/write.rs:62:28
[INFO] [stdout]    |
[INFO] [stdout] 62 |                       panic!(format!(
[INFO] [stdout]    |  ____________________________^
[INFO] [stdout] 63 | |                         "write test failed: {:?} != {:?} at channel buffer size {}, writer bufsize {}, queue length {}",
[INFO] [stdout] 64 | |                         String::from_utf8_lossy(w.data()), String::from_utf8_lossy(&text[..]),
[INFO] [stdout] 65 | |                         channel_bufsize, writer_bufsize, queuelen
[INFO] [stdout] 66 | |                     ));
[INFO] [stdout]    | |_____________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]    = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 62 |                     panic!(
[INFO] [stdout] 63 |                         "write test failed: {:?} != {:?} at channel buffer size {}, writer bufsize {}, queue length {}",
[INFO] [stdout] 64 |                         String::from_utf8_lossy(w.data()), String::from_utf8_lossy(&text[..]),
[INFO] [stdout] 65 |                         channel_bufsize, writer_bufsize, queuelen
[INFO] [stdout] 66 |                     );
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "de7a41096528d7c50d4f4c1d528a20d27960470fd1e42dc6e9ea7fb906298f2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de7a41096528d7c50d4f4c1d528a20d27960470fd1e42dc6e9ea7fb906298f2a", kill_on_drop: false }`
[INFO] [stdout] de7a41096528d7c50d4f4c1d528a20d27960470fd1e42dc6e9ea7fb906298f2a
