[INFO] cloning repository https://github.com/pop-os/buildchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pop-os/buildchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpop-os%2Fbuildchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpop-os%2Fbuildchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7876ed5cedbd19c12d8b18f6c9dad7a08d4d07cf
[INFO] testing pop-os/buildchain against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpop-os%2Fbuildchain" "/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/pop-os/buildchain on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pop-os/buildchain
[INFO] finished tweaking git repo https://github.com/pop-os/buildchain
[INFO] tweaked toml for git repo https://github.com/pop-os/buildchain written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/pop-os/buildchain already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded index-fixed v0.3.0
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a49325e73cd3414d26e3ad0cfaf52b3cfc86f36b87c4f6a4b993c964a4d363cd
[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" "a49325e73cd3414d26e3ad0cfaf52b3cfc86f36b87c4f6a4b993c964a4d363cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a49325e73cd3414d26e3ad0cfaf52b3cfc86f36b87c4f6a4b993c964a4d363cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a49325e73cd3414d26e3ad0cfaf52b3cfc86f36b87c4f6a4b993c964a4d363cd", kill_on_drop: false }`
[INFO] [stdout] a49325e73cd3414d26e3ad0cfaf52b3cfc86f36b87c4f6a4b993c964a4d363cd
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c1e9142c4aa713b98a8661363775a7e7bfe921ae3102c01858935b5c74094b2c
[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" "c1e9142c4aa713b98a8661363775a7e7bfe921ae3102c01858935b5c74094b2c", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling index-fixed v0.3.0
[INFO] [stderr]    Compiling base32 v0.4.0
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling publicsuffix v1.5.4
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling sodalite v0.3.0
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling cookie v0.12.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling failure v0.1.6
[INFO] [stderr]    Compiling serde v1.0.104
[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 `std::result::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 `std::result::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 31s
[INFO] running `Command { std: "docker" "inspect" "c1e9142c4aa713b98a8661363775a7e7bfe921ae3102c01858935b5c74094b2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1e9142c4aa713b98a8661363775a7e7bfe921ae3102c01858935b5c74094b2c", kill_on_drop: false }`
[INFO] [stdout] c1e9142c4aa713b98a8661363775a7e7bfe921ae3102c01858935b5c74094b2c
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", 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] a696ebbbeb453073d998f158f3a378f760f4d51e1cc2989afc22c3a0aa7019c8
[INFO] running `Command { std: "docker" "start" "-a" "a696ebbbeb453073d998f158f3a378f760f4d51e1cc2989afc22c3a0aa7019c8", 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] [stdout] warning: unused `std::result::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 `std::result::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]    Compiling buildchain v0.4.11 (/opt/rustwide/workdir)
[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 `Box<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 `Box<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 `Box<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 `Box<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] running `Command { std: "docker" "inspect" "a696ebbbeb453073d998f158f3a378f760f4d51e1cc2989afc22c3a0aa7019c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a696ebbbeb453073d998f158f3a378f760f4d51e1cc2989afc22c3a0aa7019c8", kill_on_drop: false }`
[INFO] [stdout] a696ebbbeb453073d998f158f3a378f760f4d51e1cc2989afc22c3a0aa7019c8