[INFO] fetching crate exprz 0.0.15...
[INFO] testing exprz-0.0.15 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate exprz 0.0.15 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate exprz 0.0.15 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exprz 0.0.15
[INFO] finished tweaking crates.io crate exprz 0.0.15
[INFO] tweaked toml for crates.io crate exprz 0.0.15 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a1bcc3f4e1a5fd097870ef32959f294e31a91d340ea4fc9f66bf4de8a66846ca
[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" "a1bcc3f4e1a5fd097870ef32959f294e31a91d340ea4fc9f66bf4de8a66846ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1bcc3f4e1a5fd097870ef32959f294e31a91d340ea4fc9f66bf4de8a66846ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1bcc3f4e1a5fd097870ef32959f294e31a91d340ea4fc9f66bf4de8a66846ca", kill_on_drop: false }`
[INFO] [stdout] a1bcc3f4e1a5fd097870ef32959f294e31a91d340ea4fc9f66bf4de8a66846ca
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ff89e3161b54e1a87efbc5b0f09d022dfe962c0f8c56b71fd4b256f15d253d5
[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" "1ff89e3161b54e1a87efbc5b0f09d022dfe962c0f8c56b71fd4b256f15d253d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling exprz v0.0.15 (/opt/rustwide/workdir)
[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(generic_associated_types)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: missing required bound on `Iter`
[INFO] [stdout]    --> src/lib.rs:161:5
[INFO] [stdout]     |
[INFO] [stdout] 161 | /     type Iter<'e>: Iterator<Item = Self::Item<'e>>
[INFO] [stdout] 162 | |     where
[INFO] [stdout] 163 | |         E: 'e;
[INFO] [stdout]     | |              ^ help: add the required where clause: `, Self: 'e`
[INFO] [stdout]     | |______________|
[INFO] [stdout]     | 
[INFO] [stdout]     |
[INFO] [stdout]     = note: this bound is currently required to ensure that impls have maximum flexibility
[INFO] [stdout]     = note: we are soliciting feedback, see issue #87479 <https://github.com/rust-lang/rust/issues/87479> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: missing required bound on `Item`
[INFO] [stdout]    --> src/lib.rs:156:5
[INFO] [stdout]     |
[INFO] [stdout] 156 | /     type Item<'e>: Reference<'e, E>
[INFO] [stdout] 157 | |     where
[INFO] [stdout] 158 | |         E: 'e;
[INFO] [stdout]     | |              ^ help: add the required where clause: `, Self: 'e`
[INFO] [stdout]     | |______________|
[INFO] [stdout]     | 
[INFO] [stdout]     |
[INFO] [stdout]     = note: this bound is currently required to ensure that impls have maximum flexibility
[INFO] [stdout]     = note: we are soliciting feedback, see issue #87479 <https://github.com/rust-lang/rust/issues/87479> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: missing required bound on `Ref`
[INFO] [stdout]    --> src/lib.rs:262:5
[INFO] [stdout]     |
[INFO] [stdout] 262 | /     type Ref<'e>: GroupReference<E>
[INFO] [stdout] 263 | |     where
[INFO] [stdout] 264 | |         E: 'e;
[INFO] [stdout]     | |              ^ help: add the required where clause: `, Self: 'e`
[INFO] [stdout]     | |______________|
[INFO] [stdout]     | 
[INFO] [stdout]     |
[INFO] [stdout]     = note: this bound is currently required to ensure that impls have maximum flexibility
[INFO] [stdout]     = note: we are soliciting feedback, see issue #87479 <https://github.com/rust-lang/rust/issues/87479> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exprz` due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "1ff89e3161b54e1a87efbc5b0f09d022dfe962c0f8c56b71fd4b256f15d253d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ff89e3161b54e1a87efbc5b0f09d022dfe962c0f8c56b71fd4b256f15d253d5", kill_on_drop: false }`
[INFO] [stdout] 1ff89e3161b54e1a87efbc5b0f09d022dfe962c0f8c56b71fd4b256f15d253d5