[INFO] fetching crate graph 0.1.5...
[INFO] checking graph-0.1.5 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate graph 0.1.5 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate graph 0.1.5 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate graph 0.1.5
[INFO] finished tweaking crates.io crate graph 0.1.5
[INFO] tweaked toml for crates.io crate graph 0.1.5 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate crates.io crate graph 0.1.5 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded byte-slice-cast v1.0.0
[INFO] [stderr]   Downloaded atoi v0.4.0
[INFO] [stderr]   Downloaded pico-args v0.4.2
[INFO] [stderr]   Downloaded num v0.4.0
[INFO] [stderr]   Downloaded num-format v0.4.0
[INFO] [stderr]   Downloaded atomic_float v0.1.0
[INFO] [stderr]   Downloaded fast-float v0.2.0
[INFO] [stderr]   Downloaded delegate v0.6.1
[INFO] [stderr]   Downloaded linereader v0.4.0
[INFO] [stderr]   Downloaded gdl v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f7761718dd64666e063d333f2b937552f8c16a6ae4bac75f406d7cfb441488db
[INFO] running `Command { std: "docker" "start" "-a" "f7761718dd64666e063d333f2b937552f8c16a6ae4bac75f406d7cfb441488db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7761718dd64666e063d333f2b937552f8c16a6ae4bac75f406d7cfb441488db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7761718dd64666e063d333f2b937552f8c16a6ae4bac75f406d7cfb441488db", kill_on_drop: false }`
[INFO] [stdout] f7761718dd64666e063d333f2b937552f8c16a6ae4bac75f406d7cfb441488db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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" "+beta-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 97872f47ec113629fe999f1d0847446255f239923b63e8b42701677766650f35
[INFO] running `Command { std: "docker" "start" "-a" "97872f47ec113629fe999f1d0847446255f239923b63e8b42701677766650f35", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking bitflags v1.3.1
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking byte-slice-cast v1.0.0
[INFO] [stderr]     Checking fast-float v0.2.0
[INFO] [stderr]     Checking atomic_float v0.1.0
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking atoi v0.4.0
[INFO] [stderr]     Checking page_size v0.4.2
[INFO] [stderr]     Checking linereader v0.4.0
[INFO] [stderr]     Checking memmap2 v0.3.0
[INFO] [stderr]     Checking lexical-core v0.7.6
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking regex v1.4.6
[INFO] [stderr]     Checking num-format v0.4.0
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking nom v6.2.1
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.25
[INFO] [stderr]    Compiling delegate v0.6.1
[INFO] [stderr]     Checking thiserror v1.0.25
[INFO] [stderr]     Checking gdl v0.2.4
[INFO] [stderr]     Checking graph v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_partition_dedup)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_spare_capacity)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(maybe_uninit_write_slice)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(maybe_uninit_slice)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(new_uninit)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_partition_dedup)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `serialize` exists for struct `csr::DirectedCsrGraph<usize>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:843:20
[INFO] [stdout]     |
[INFO] [stdout] 335 | pub struct DirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | ---------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | method `serialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] ...
[INFO] [stdout] 843 |         assert!(g0.serialize(&file).is_ok());
[INFO] [stdout]     |                    ^^^^^^^^^ method cannot be called on `csr::DirectedCsrGraph<usize>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToByteSlice`
[INFO] [stdout]             which is required by `csr::DirectedCsrGraph<usize>: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_spare_capacity)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `graph` due to 17 previous errors
[INFO] [stdout] error[E0599]: the function or associated item `deserialize` exists for struct `csr::DirectedCsrGraph<usize>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:846:45
[INFO] [stdout]     |
[INFO] [stdout] 335 | pub struct DirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | ---------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | function or associated item `deserialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::DeserializeGraphOp<_, csr::DirectedCsrGraph<usize>>`
[INFO] [stdout] ...
[INFO] [stdout] 846 |         let g1 = DirectedCsrGraph::<usize>::deserialize(file).unwrap();
[INFO] [stdout]     |                                             ^^^^^^^^^^^ function or associated item cannot be called on `csr::DirectedCsrGraph<usize>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToMutByteSlice`
[INFO] [stdout]             which is required by `csr::DirectedCsrGraph<usize>: graph_ops::DeserializeGraphOp<_, csr::DirectedCsrGraph<usize>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0599]: the method `serialize` exists for struct `csr::UndirectedCsrGraph<usize>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:870:20
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | method `serialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] ...
[INFO] [stdout] 870 |         assert!(g0.serialize(&file).is_ok());
[INFO] [stdout]     |                    ^^^^^^^^^ method cannot be called on `csr::UndirectedCsrGraph<usize>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<usize>: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the function or associated item `deserialize` exists for struct `csr::UndirectedCsrGraph<usize>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:874:47
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | function or associated item `deserialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<usize>>`
[INFO] [stdout] ...
[INFO] [stdout] 874 |         let g1 = UndirectedCsrGraph::<usize>::deserialize(file).unwrap();
[INFO] [stdout]     |                                               ^^^^^^^^^^^ function or associated item cannot be called on `csr::UndirectedCsrGraph<usize>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToMutByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<usize>: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<usize>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `serialize` exists for struct `csr::DirectedCsrGraph<u32>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:893:20
[INFO] [stdout]     |
[INFO] [stdout] 335 | pub struct DirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | ---------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | method `serialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] ...
[INFO] [stdout] 893 |         assert!(g0.serialize(&file).is_ok());
[INFO] [stdout]     |                    ^^^^^^^^^ method cannot be called on `csr::DirectedCsrGraph<u32>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToByteSlice`
[INFO] [stdout]             which is required by `csr::DirectedCsrGraph<u32>: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the function or associated item `deserialize` exists for struct `csr::DirectedCsrGraph<u32>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:896:43
[INFO] [stdout]     |
[INFO] [stdout] 335 | pub struct DirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | ---------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | function or associated item `deserialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::DeserializeGraphOp<_, csr::DirectedCsrGraph<u32>>`
[INFO] [stdout] ...
[INFO] [stdout] 896 |         let g1 = DirectedCsrGraph::<u32>::deserialize(file).unwrap();
[INFO] [stdout]     |                                           ^^^^^^^^^^^ function or associated item cannot be called on `csr::DirectedCsrGraph<u32>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToMutByteSlice`
[INFO] [stdout]             which is required by `csr::DirectedCsrGraph<u32>: graph_ops::DeserializeGraphOp<_, csr::DirectedCsrGraph<u32>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `serialize` exists for struct `csr::UndirectedCsrGraph<u32>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:920:20
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | method `serialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] ...
[INFO] [stdout] 920 |         assert!(g0.serialize(&file).is_ok());
[INFO] [stdout]     |                    ^^^^^^^^^ method cannot be called on `csr::UndirectedCsrGraph<u32>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<u32>: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the function or associated item `deserialize` exists for struct `csr::UndirectedCsrGraph<u32>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:924:45
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | function or associated item `deserialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<u32>>`
[INFO] [stdout] ...
[INFO] [stdout] 924 |         let g1 = UndirectedCsrGraph::<u32>::deserialize(file).unwrap();
[INFO] [stdout]     |                                             ^^^^^^^^^^^ function or associated item cannot be called on `csr::UndirectedCsrGraph<u32>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToMutByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<u32>: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<u32>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `serialize` exists for struct `csr::UndirectedCsrGraph<u32>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:943:20
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | method `serialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] ...
[INFO] [stdout] 943 |         assert!(g0.serialize(&file).is_ok());
[INFO] [stdout]     |                    ^^^^^^^^^ method cannot be called on `csr::UndirectedCsrGraph<u32>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<u32>: graph_ops::SerializeGraphOp<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the function or associated item `deserialize` exists for struct `csr::UndirectedCsrGraph<usize>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/graph/csr.rs:948:42
[INFO] [stdout]     |
[INFO] [stdout] 496 | pub struct UndirectedCsrGraph<NI: Idx, EV = ()> {
[INFO] [stdout]     | -----------------------------------------------
[INFO] [stdout]     | |
[INFO] [stdout]     | function or associated item `deserialize` not found for this
[INFO] [stdout]     | doesn't satisfy `_: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<usize>>`
[INFO] [stdout] ...
[INFO] [stdout] 948 |             UndirectedCsrGraph::<usize>::deserialize(file);
[INFO] [stdout]     |                                          ^^^^^^^^^^^ function or associated item cannot be called on `csr::UndirectedCsrGraph<usize>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `(): ToMutByteSlice`
[INFO] [stdout]             which is required by `csr::UndirectedCsrGraph<usize>: graph_ops::DeserializeGraphOp<_, csr::UndirectedCsrGraph<usize>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 16 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(maybe_uninit_write_slice)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(maybe_uninit_slice)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(new_uninit)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "97872f47ec113629fe999f1d0847446255f239923b63e8b42701677766650f35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97872f47ec113629fe999f1d0847446255f239923b63e8b42701677766650f35", kill_on_drop: false }`
[INFO] [stdout] 97872f47ec113629fe999f1d0847446255f239923b63e8b42701677766650f35
