[INFO] fetching crate rust-base58 0.0.4...
[INFO] testing rust-base58-0.0.4 against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] extracting crate rust-base58 0.0.4 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate rust-base58 0.0.4 on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust-base58 0.0.4
[INFO] finished tweaking crates.io crate rust-base58 0.0.4
[INFO] tweaked toml for crates.io crate rust-base58 0.0.4 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ada7ccb160c0645dda25a9ffe0a76519452fd6ca82384c6b413fb927042bd4c
[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" "9ada7ccb160c0645dda25a9ffe0a76519452fd6ca82384c6b413fb927042bd4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ada7ccb160c0645dda25a9ffe0a76519452fd6ca82384c6b413fb927042bd4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ada7ccb160c0645dda25a9ffe0a76519452fd6ca82384c6b413fb927042bd4c", kill_on_drop: false }`
[INFO] [stdout] 9ada7ccb160c0645dda25a9ffe0a76519452fd6ca82384c6b413fb927042bd4c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8b03a7db82704f86f99244038c02e2c54a8ae4cb46a9666293e52125efd29aa
[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" "f8b03a7db82704f86f99244038c02e2c54a8ae4cb46a9666293e52125efd29aa", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]    Compiling num-complex v0.3.0
[INFO] [stderr]    Compiling num v0.3.0
[INFO] [stderr]    Compiling rust-base58 v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: static is never used: `FLICKR_ALPHA`
[INFO] [stdout]   --> src/base58.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | / static FLICKR_ALPHA: &'static[u8] = b"123456789\
[INFO] [stdout] 13 | |                                       abcdefghijkmnopqrstuvwxyz\
[INFO] [stdout] 14 | |                                       ABCDEFGHJKLMNPQRSTUVWXYZ";
[INFO] [stdout]    | |________________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.57s
[INFO] running `Command { std: "docker" "inspect" "f8b03a7db82704f86f99244038c02e2c54a8ae4cb46a9666293e52125efd29aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8b03a7db82704f86f99244038c02e2c54a8ae4cb46a9666293e52125efd29aa", kill_on_drop: false }`
[INFO] [stdout] f8b03a7db82704f86f99244038c02e2c54a8ae4cb46a9666293e52125efd29aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "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] bdd200f82fb1b6905ae9941ce36eff9f9910d52fa96daa61bee7a006dd6cd963
[INFO] running `Command { std: "docker" "start" "-a" "bdd200f82fb1b6905ae9941ce36eff9f9910d52fa96daa61bee7a006dd6cd963", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stdout] warning: static is never used: `FLICKR_ALPHA`
[INFO] [stdout]   --> src/base58.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | / static FLICKR_ALPHA: &'static[u8] = b"123456789\
[INFO] [stdout] 13 | |                                       abcdefghijkmnopqrstuvwxyz\
[INFO] [stdout] 14 | |                                       ABCDEFGHJKLMNPQRSTUVWXYZ";
[INFO] [stdout]    | |________________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling rust-base58 v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `gen_iter` found for struct `rand::prelude::ThreadRng` in the current scope
[INFO] [stdout]    --> src/base58.rs:201:34
[INFO] [stdout]     |
[INFO] [stdout] 201 |             let v = thread_rng().gen_iter::<u8>().take(times)
[INFO] [stdout]     |                                  ^^^^^^^^ method not found in `rand::prelude::ThreadRng`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-base58`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "bdd200f82fb1b6905ae9941ce36eff9f9910d52fa96daa61bee7a006dd6cd963", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdd200f82fb1b6905ae9941ce36eff9f9910d52fa96daa61bee7a006dd6cd963", kill_on_drop: false }`
[INFO] [stdout] bdd200f82fb1b6905ae9941ce36eff9f9910d52fa96daa61bee7a006dd6cd963