[INFO] fetching crate buildchain 0.4.11...
[INFO] building buildchain-0.4.11 against master#881c1ac408d93bb7adaa3a51dabab9266e82eee8 for issue-85264
[INFO] extracting crate buildchain 0.4.11 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate buildchain 0.4.11 on toolchain 881c1ac408d93bb7adaa3a51dabab9266e82eee8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buildchain 0.4.11
[INFO] finished tweaking crates.io crate buildchain 0.4.11
[INFO] tweaked toml for crates.io crate buildchain 0.4.11 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate buildchain 0.4.11 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded index-fixed v0.3.0
[INFO] [stderr]   Downloaded lxd v0.1.8
[INFO] [stderr]   Downloaded sodalite v0.3.0
[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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 58989a0a1638bbdc9cf3b7d71bd283fca0db2274b2186077fe158f2a456d761c
[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" "58989a0a1638bbdc9cf3b7d71bd283fca0db2274b2186077fe158f2a456d761c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "58989a0a1638bbdc9cf3b7d71bd283fca0db2274b2186077fe158f2a456d761c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58989a0a1638bbdc9cf3b7d71bd283fca0db2274b2186077fe158f2a456d761c", kill_on_drop: false }`
[INFO] [stdout] 58989a0a1638bbdc9cf3b7d71bd283fca0db2274b2186077fe158f2a456d761c
[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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c647107be0de7a69ca5e8c6955f13ccd3971b9f81453ad7da0de338532b0a51c
[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" "c647107be0de7a69ca5e8c6955f13ccd3971b9f81453ad7da0de338532b0a51c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling futures v0.1.29
[INFO] [stderr]    Compiling cc v1.0.48
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[INFO] [stderr]    Compiling rand_core v0.4.2
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[INFO] [stderr]    Compiling pkg-config v0.3.17
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling openssl v0.10.26
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
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[INFO] [stderr]    Compiling dtoa v0.4.4
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[INFO] [stderr]    Compiling unicode-normalization v0.1.11
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[INFO] [stderr]    Compiling error-chain v0.12.1
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[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling hyper v0.12.35
[INFO] [stderr]    Compiling base64 v0.10.1
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[INFO] [stderr]    Compiling num_cpus v1.11.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling flate2 v1.0.13
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling openssl-sys v0.9.53
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling quote v1.0.2
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[INFO] [stderr]    Compiling crossbeam-deque v0.7.2
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[INFO] [stderr]    Compiling futures-cpupool v0.1.8
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[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.12
[INFO] [stderr]    Compiling tokio-threadpool v0.1.17
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling http v0.1.21
[INFO] [stderr]    Compiling string v0.2.1
[INFO] [stderr]    Compiling tokio-buf v0.1.1
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling url v2.1.0
[INFO] [stderr]    Compiling tokio-reactor v0.1.11
[INFO] [stderr]    Compiling backtrace v0.3.40
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling publicsuffix v1.5.4
[INFO] [stderr]    Compiling cookie v0.12.0
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling http-body v0.1.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling failure v0.1.6
[INFO] [stderr]    Compiling hyper-tls v0.3.2
[INFO] [stderr]    Compiling serde_json v1.0.44
[INFO] [stderr]    Compiling serde_urlencoded v0.5.5
[INFO] [stderr]    Compiling cookie_store v0.7.0
[INFO] [stderr]    Compiling lxd v0.1.8
[INFO] [stderr]    Compiling reqwest v0.9.24
[INFO] [stderr]    Compiling buildchain v0.4.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:39:29
[INFO] [stdout]    |
[INFO] [stdout] 39 |     format!("{}: {:?}", err.description(), err)
[INFO] [stdout]    |                             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `digest`
[INFO] [stdout]    --> src/download.rs:122:20
[INFO] [stdout]     |
[INFO] [stdout] 122 |         for (file, digest) in manifest.files.iter() {
[INFO] [stdout]     |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_digest`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `signature`
[INFO] [stdout]  --> src/block.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     signature: [u8; 64],
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `public_key`
[INFO] [stdout]   --> src/block.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     public_key: [u8; 32],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `previous_signature`
[INFO] [stdout]   --> src/block.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     previous_signature: [u8; 64],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `counter`
[INFO] [stdout]   --> src/block.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     counter: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `timestamp`
[INFO] [stdout]   --> src/block.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     timestamp: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/store.rs:229:9
[INFO] [stdout]     |
[INFO] [stdout] 229 |         create_dir_if_needed(&pb);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/store.rs:231:9
[INFO] [stdout]     |
[INFO] [stdout] 231 |         create_dir_if_needed(&pb);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 01s
[INFO] running `Command { std: "docker" "inspect" "c647107be0de7a69ca5e8c6955f13ccd3971b9f81453ad7da0de338532b0a51c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c647107be0de7a69ca5e8c6955f13ccd3971b9f81453ad7da0de338532b0a51c", kill_on_drop: false }`
[INFO] [stdout] c647107be0de7a69ca5e8c6955f13ccd3971b9f81453ad7da0de338532b0a51c
[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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb48a5b901622ea898acd51e325f056340209a057fdea86dec5a1ca8ed635f52
[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" "bb48a5b901622ea898acd51e325f056340209a057fdea86dec5a1ca8ed635f52", kill_on_drop: false }`
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:39:29
[INFO] [stdout]    |
[INFO] [stdout] 39 |     format!("{}: {:?}", err.description(), err)
[INFO] [stdout]    |                             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `digest`
[INFO] [stdout]    --> src/download.rs:122:20
[INFO] [stdout]     |
[INFO] [stdout] 122 |         for (file, digest) in manifest.files.iter() {
[INFO] [stdout]     |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_digest`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `signature`
[INFO] [stdout]  --> src/block.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     signature: [u8; 64],
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `public_key`
[INFO] [stdout]   --> src/block.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     public_key: [u8; 32],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `previous_signature`
[INFO] [stdout]   --> src/block.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     previous_signature: [u8; 64],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `counter`
[INFO] [stdout]   --> src/block.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     counter: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `timestamp`
[INFO] [stdout]   --> src/block.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     timestamp: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling buildchain v0.4.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/store.rs:229:9
[INFO] [stdout]     |
[INFO] [stdout] 229 |         create_dir_if_needed(&pb);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/store.rs:231:9
[INFO] [stdout]     |
[INFO] [stdout] 231 |         create_dir_if_needed(&pb);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Rng`
[INFO] [stdout]    --> src/store.rs:254:16
[INFO] [stdout]     |
[INFO] [stdout] 254 |     use rand::{Rng, OsRng};
[INFO] [stdout]     |                ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `rand::OsRng`: import with rand::rngs::OsRng instead
[INFO] [stdout]    --> src/store.rs:254:21
[INFO] [stdout]     |
[INFO] [stdout] 254 |     use rand::{Rng, OsRng};
[INFO] [stdout]     |                     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `rand::OsRng`: import with rand::rngs::OsRng instead
[INFO] [stdout]    --> src/store.rs:317:27
[INFO] [stdout]     |
[INFO] [stdout] 317 |             let mut rng = OsRng::new().unwrap();
[INFO] [stdout]     |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `rand::OsRng`: import with rand::rngs::OsRng instead
[INFO] [stdout]    --> src/store.rs:361:27
[INFO] [stdout]     |
[INFO] [stdout] 361 |             let mut rng = OsRng::new().unwrap();
[INFO] [stdout]     |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `rand::OsRng`: import with rand::rngs::OsRng instead
[INFO] [stdout]    --> src/store.rs:395:27
[INFO] [stdout]     |
[INFO] [stdout] 395 |             let mut rng = OsRng::new().unwrap();
[INFO] [stdout]     |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `rand::OsRng`: import with rand::rngs::OsRng instead
[INFO] [stdout]    --> src/store.rs:431:27
[INFO] [stdout]     |
[INFO] [stdout] 431 |             let mut rng = OsRng::new().unwrap();
[INFO] [stdout]     |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:39:29
[INFO] [stdout]    |
[INFO] [stdout] 39 |     format!("{}: {:?}", err.description(), err)
[INFO] [stdout]    |                             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fill_bytes` found for struct `rand::OsRng` in the current scope
[INFO] [stdout]    --> src/store.rs:318:17
[INFO] [stdout]     |
[INFO] [stdout] 318 |             rng.fill_bytes(&mut content);
[INFO] [stdout]     |                 ^^^^^^^^^^ method not found in `rand::OsRng`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rand_core-0.4.2/src/lib.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 |     fn fill_bytes(&mut self, dest: &mut [u8]);
[INFO] [stdout]     |        ---------- the method is available for `rand::OsRng` here
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]     = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]             `use rand::RngCore;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fill_bytes` found for struct `rand::OsRng` in the current scope
[INFO] [stdout]    --> src/store.rs:362:17
[INFO] [stdout]     |
[INFO] [stdout] 362 |             rng.fill_bytes(&mut content);
[INFO] [stdout]     |                 ^^^^^^^^^^ method not found in `rand::OsRng`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rand_core-0.4.2/src/lib.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 |     fn fill_bytes(&mut self, dest: &mut [u8]);
[INFO] [stdout]     |        ---------- the method is available for `rand::OsRng` here
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]     = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]             `use rand::RngCore;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fill_bytes` found for struct `rand::OsRng` in the current scope
[INFO] [stdout]    --> src/store.rs:396:17
[INFO] [stdout]     |
[INFO] [stdout] 396 |             rng.fill_bytes(&mut block);
[INFO] [stdout]     |                 ^^^^^^^^^^ method not found in `rand::OsRng`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rand_core-0.4.2/src/lib.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 |     fn fill_bytes(&mut self, dest: &mut [u8]);
[INFO] [stdout]     |        ---------- the method is available for `rand::OsRng` here
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]     = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]             `use rand::RngCore;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fill_bytes` found for struct `rand::OsRng` in the current scope
[INFO] [stdout]    --> src/store.rs:432:17
[INFO] [stdout]     |
[INFO] [stdout] 432 |             rng.fill_bytes(&mut block);
[INFO] [stdout]     |                 ^^^^^^^^^^ method not found in `rand::OsRng`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rand_core-0.4.2/src/lib.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 |     fn fill_bytes(&mut self, dest: &mut [u8]);
[INFO] [stdout]     |        ---------- the method is available for `rand::OsRng` here
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]     = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]             `use rand::RngCore;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `buildchain`
[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" "bb48a5b901622ea898acd51e325f056340209a057fdea86dec5a1ca8ed635f52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb48a5b901622ea898acd51e325f056340209a057fdea86dec5a1ca8ed635f52", kill_on_drop: false }`
[INFO] [stdout] bb48a5b901622ea898acd51e325f056340209a057fdea86dec5a1ca8ed635f52
