[INFO] crate tao-of-rust 1.0.2 is already in cache
[INFO] checking tao-of-rust-1.0.2 against try#8810c24b0958114d8dbb32d878444e8956fce80f for pr-66063
[INFO] extracting crate tao-of-rust 1.0.2 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate tao-of-rust 1.0.2 on toolchain 8810c24b0958114d8dbb32d878444e8956fce80f
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate tao-of-rust 1.0.2
[INFO] finished tweaking crates.io crate tao-of-rust 1.0.2
[INFO] tweaked toml for crates.io crate tao-of-rust 1.0.2 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=allow" "-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" "+8810c24b0958114d8dbb32d878444e8956fce80f" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 25aa0b580ff6f7c3c21647a99bf62f17a44c8f3628552d84bde18594feb18673
[INFO] running `"docker" "start" "-a" "25aa0b580ff6f7c3c21647a99bf62f17a44c8f3628552d84bde18594feb18673"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking csv_challenge v0.1.0
[INFO] [stderr]     Checking failures_crate v0.1.0
[INFO] [stderr]     Checking tao-of-rust v1.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(never_type)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(specialization)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(unboxed_closures, fn_traits)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(never_type)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(specialization)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(unboxed_closures, fn_traits)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0520]: `swim` specializes an item from a parent `impl`, but that item is not marked `default`
[INFO] [stderr]    --> src/ch03/trait_limit.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 154 |       impl<T> Swimmer for Diver<T> {}
[INFO] [stderr]     |       ------------------------------- parent `impl` is here
[INFO] [stderr] ...
[INFO] [stderr] 157 | /         fn swim(&self) {
[INFO] [stderr] 158 | |             println!("drowning, help!")
[INFO] [stderr] 159 | |         }
[INFO] [stderr]     | |_________^ cannot specialize default item `swim`
[INFO] [stderr]     |
[INFO] [stderr]     = note: to specialize, `swim` in the parent `impl` must be marked `default`
[INFO] [stderr] 
[INFO] [stderr] error[E0520]: `swim` specializes an item from a parent `impl`, but that item is not marked `default`
[INFO] [stderr]    --> src/ch03/trait_limit.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 154 |       impl<T> Swimmer for Diver<T> {}
[INFO] [stderr]     |       ------------------------------- parent `impl` is here
[INFO] [stderr] ...
[INFO] [stderr] 157 | /         fn swim(&self) {
[INFO] [stderr] 158 | |             println!("drowning, help!")
[INFO] [stderr] 159 | |         }
[INFO] [stderr]     | |_________^ cannot specialize default item `swim`
[INFO] [stderr]     |
[INFO] [stderr]     = note: to specialize, `swim` in the parent `impl` must be marked `default`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0520, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0520`.
[INFO] [stderr] error: could not compile `tao-of-rust`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0520, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0520`.
[INFO] [stderr] error: could not compile `tao-of-rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "25aa0b580ff6f7c3c21647a99bf62f17a44c8f3628552d84bde18594feb18673"`
[INFO] running `"docker" "rm" "-f" "25aa0b580ff6f7c3c21647a99bf62f17a44c8f3628552d84bde18594feb18673"`
[INFO] [stdout] 25aa0b580ff6f7c3c21647a99bf62f17a44c8f3628552d84bde18594feb18673