[INFO] cloning repository https://github.com/autovis/nebra
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/autovis/nebra" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fautovis%2Fnebra", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fautovis%2Fnebra'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0fc36d6e74374457a25e8d1dcc2324a12ad6340d
[INFO] testing autovis/nebra against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fautovis%2Fnebra" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/autovis/nebra 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 git repo https://github.com/autovis/nebra
[INFO] finished tweaking git repo https://github.com/autovis/nebra
[INFO] tweaked toml for git repo https://github.com/autovis/nebra written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/autovis/nebra already has a lockfile, it will not be regenerated
[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-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" "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] 47b114f6148522051f9f624c7abdaa11958c56e9d2c9bf8edab82cbff8372baf
[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" "47b114f6148522051f9f624c7abdaa11958c56e9d2c9bf8edab82cbff8372baf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47b114f6148522051f9f624c7abdaa11958c56e9d2c9bf8edab82cbff8372baf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47b114f6148522051f9f624c7abdaa11958c56e9d2c9bf8edab82cbff8372baf", kill_on_drop: false }`
[INFO] [stdout] 47b114f6148522051f9f624c7abdaa11958c56e9d2c9bf8edab82cbff8372baf
[INFO] running `Command { std: "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" "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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f265bd342eefa4b40041856be7a0c50a2a73f9e08f6d5f1036dbf4b19ba2892
[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" "1f265bd342eefa4b40041856be7a0c50a2a73f9e08f6d5f1036dbf4b19ba2892", kill_on_drop: false }`
[INFO] [stderr]    Compiling nebra v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0515]: cannot return value referencing local variable `bor`
[INFO] [stdout]   --> src/stream.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |             retval = bor.get_unchecked(((self.index() as usize) - bars_ago) % size);
[INFO] [stdout]    |                      --- `bor` is borrowed here
[INFO] [stdout] 92 |         }
[INFO] [stdout] 93 |         retval
[INFO] [stdout]    |         ^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow data in a dereference of `Ref<'_, Vec<T>>` as mutable
[INFO] [stdout]   --> src/stream.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |         self.buffer.borrow()[idx % size] = value;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Ref<'_, Vec<T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow data in a dereference of `Ref<'_, Vec<T>>` as mutable
[INFO] [stdout]    --> src/stream.rs:105:13
[INFO] [stdout]     |
[INFO] [stdout] 105 |             self.buffer.borrow().push(Default::default());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stdout]     |
[INFO] [stdout]     = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Ref<'_, Vec<T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow data in a dereference of `Ref<'_, Vec<T>>` as mutable
[INFO] [stdout]    --> src/stream.rs:108:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |             self.buffer.borrow()[(self.index.get() as usize) % size] = Default::default();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stdout]     |
[INFO] [stdout]     = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Ref<'_, Vec<T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0515, E0596.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nebra` due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "1f265bd342eefa4b40041856be7a0c50a2a73f9e08f6d5f1036dbf4b19ba2892", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f265bd342eefa4b40041856be7a0c50a2a73f9e08f6d5f1036dbf4b19ba2892", kill_on_drop: false }`
[INFO] [stdout] 1f265bd342eefa4b40041856be7a0c50a2a73f9e08f6d5f1036dbf4b19ba2892