[INFO] cloning repository https://github.com/nreinhardt/rusty-backup
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nreinhardt/rusty-backup" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnreinhardt%2Frusty-backup", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnreinhardt%2Frusty-backup'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d9dbd2fe304182fba216a60b85a659e88e0da92e
[INFO] testing nreinhardt/rusty-backup against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnreinhardt%2Frusty-backup" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nreinhardt/rusty-backup on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nreinhardt/rusty-backup
[INFO] finished tweaking git repo https://github.com/nreinhardt/rusty-backup
[INFO] tweaked toml for git repo https://github.com/nreinhardt/rusty-backup written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4875be720bdd85dfe8f5106c9e1695976c907032f4b75c08734c597401c6dc2c
[INFO] running `Command { std: "docker" "start" "-a" "4875be720bdd85dfe8f5106c9e1695976c907032f4b75c08734c597401c6dc2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4875be720bdd85dfe8f5106c9e1695976c907032f4b75c08734c597401c6dc2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4875be720bdd85dfe8f5106c9e1695976c907032f4b75c08734c597401c6dc2c", kill_on_drop: false }`
[INFO] [stdout] 4875be720bdd85dfe8f5106c9e1695976c907032f4b75c08734c597401c6dc2c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3fa498b8362847ca315fdb75ef5091877b7c29f8ff5dd0b94d01e7affb793525
[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" "3fa498b8362847ca315fdb75ef5091877b7c29f8ff5dd0b94d01e7affb793525", kill_on_drop: false }`
[INFO] [stderr]    Compiling arc-swap v0.4.7
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling rayon-core v1.8.1
[INFO] [stderr]    Compiling anyhow v1.0.33
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling rayon v1.4.1
[INFO] [stderr]    Compiling futures-channel v0.3.6
[INFO] [stderr]    Compiling crossbeam-channel v0.4.4
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling signal-hook-registry v1.2.1
[INFO] [stderr]    Compiling crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling crossbeam v0.7.3
[INFO] [stderr]    Compiling futures-macro v0.3.6
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling tokio v0.2.22
[INFO] [stderr]    Compiling futures-util v0.3.6
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-tls v0.3.1
[INFO] [stderr]    Compiling h2 v0.2.6
[INFO] [stderr]    Compiling futures-executor v0.3.6
[INFO] [stderr]    Compiling futures v0.3.6
[INFO] [stderr]    Compiling hyper v0.13.8
[INFO] [stderr]    Compiling hyper-tls v0.4.3
[INFO] [stderr]    Compiling reqwest v0.10.8
[INFO] [stderr]    Compiling backup v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'backtrace'
[INFO] [stdout]   --> src/lib.rs:17:23
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let backtrace = e.backtrace().to_string();
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53487 <https://github.com/rust-lang/rust/issues/53487> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `to_string` found for enum `std::option::Option<&std::backtrace::Backtrace>` in the current scope
[INFO] [stdout]    --> src/lib.rs:17:35
[INFO] [stdout]     |
[INFO] [stdout] 17  |       let backtrace = e.backtrace().to_string();
[INFO] [stdout]     |                                     ^^^^^^^^^ method not found in `std::option::Option<&std::backtrace::Backtrace>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method `to_string` exists but the following trait bounds were not satisfied:
[INFO] [stdout]             `std::option::Option<&std::backtrace::Backtrace>: std::fmt::Display`
[INFO] [stdout]             which is required by `std::option::Option<&std::backtrace::Backtrace>: std::string::ToString`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0599, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `backup`.
[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" "3fa498b8362847ca315fdb75ef5091877b7c29f8ff5dd0b94d01e7affb793525", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fa498b8362847ca315fdb75ef5091877b7c29f8ff5dd0b94d01e7affb793525", kill_on_drop: false }`
[INFO] [stdout] 3fa498b8362847ca315fdb75ef5091877b7c29f8ff5dd0b94d01e7affb793525
