[INFO] cloning repository https://github.com/PrVrSs/py-binary-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PrVrSs/py-binary-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrVrSs%2Fpy-binary-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrVrSs%2Fpy-binary-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a111c976d9fdf9ad9db761d34a5448f6b4c09071
[INFO] checking PrVrSs/py-binary-tree against master#50e1dc1536264ab71c0850f346b12309477f29f7 for pr-85073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrVrSs%2Fpy-binary-tree" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PrVrSs/py-binary-tree on toolchain 50e1dc1536264ab71c0850f346b12309477f29f7
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/PrVrSs/py-binary-tree
[INFO] finished tweaking git repo https://github.com/PrVrSs/py-binary-tree
[INFO] tweaked toml for git repo https://github.com/PrVrSs/py-binary-tree written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/PrVrSs/py-binary-tree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 20ff1923eb4ed91cd73eda33d9b0de8d0316be99f1c08261e52f7e6baf5bdb70
[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" "20ff1923eb4ed91cd73eda33d9b0de8d0316be99f1c08261e52f7e6baf5bdb70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20ff1923eb4ed91cd73eda33d9b0de8d0316be99f1c08261e52f7e6baf5bdb70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20ff1923eb4ed91cd73eda33d9b0de8d0316be99f1c08261e52f7e6baf5bdb70", kill_on_drop: false }`
[INFO] [stdout] 20ff1923eb4ed91cd73eda33d9b0de8d0316be99f1c08261e52f7e6baf5bdb70
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=forbid" "-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b952aa82a9909569732fd2b22f63e1e5cbadb307685b4fd26a34a2be777615a
[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" "6b952aa82a9909569732fd2b22f63e1e5cbadb307685b4fd26a34a2be777615a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling ryu v1.0.3
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling proc-macro-hack v0.5.15
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling inventory v0.1.6
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]     Checking unindent v0.1.5
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stdout] error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.3.4/src/mutex.rs:106:6
[INFO] [stdout]     |
[INFO] [stdout] 106 | impl<R: RawMutex, T> Mutex<R, T> {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
[INFO] [stdout]     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.3.4/src/remutex.rs:162:6
[INFO] [stdout]     |
[INFO] [stdout] 162 | impl<R: RawMutex, G: GetThreadId, T> ReentrantMutex<R, G, T> {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
[INFO] [stdout]     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.3.4/src/remutex.rs:162:19
[INFO] [stdout]     |
[INFO] [stdout] 162 | impl<R: RawMutex, G: GetThreadId, T> ReentrantMutex<R, G, T> {
[INFO] [stdout]     |                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
[INFO] [stdout]     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.3.4/src/rwlock.rs:271:6
[INFO] [stdout]     |
[INFO] [stdout] 271 | impl<R: RawRwLock, T> RwLock<R, T> {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
[INFO] [stdout]     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
[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 E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lock_api`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6b952aa82a9909569732fd2b22f63e1e5cbadb307685b4fd26a34a2be777615a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b952aa82a9909569732fd2b22f63e1e5cbadb307685b4fd26a34a2be777615a", kill_on_drop: false }`
[INFO] [stdout] 6b952aa82a9909569732fd2b22f63e1e5cbadb307685b4fd26a34a2be777615a