[INFO] fetching crate fuzzcheck 0.1.1...
[INFO] checking fuzzcheck-0.1.1 against master#f9fdf642bab2bfcabe1829a4c82aaf055330661b for pr-73102
[INFO] extracting crate fuzzcheck 0.1.1 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate fuzzcheck 0.1.1 on toolchain f9fdf642bab2bfcabe1829a4c82aaf055330661b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f9fdf642bab2bfcabe1829a4c82aaf055330661b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate fuzzcheck 0.1.1
[INFO] finished tweaking crates.io crate fuzzcheck 0.1.1
[INFO] tweaked toml for crates.io crate fuzzcheck 0.1.1 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f9fdf642bab2bfcabe1829a4c82aaf055330661b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f9fdf642bab2bfcabe1829a4c82aaf055330661b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "/opt/rustwide/cargo-home/bin/cargo" "+f9fdf642bab2bfcabe1829a4c82aaf055330661b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d4aadc89be23c78387b616d81af574bfd50b7fbfe2194317d5b5718164a60bed
[INFO] running `"docker" "start" "-a" "d4aadc89be23c78387b616d81af574bfd50b7fbfe2194317d5b5718164a60bed"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling fuzzcheck v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking ahash v0.3.8
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking fuzzcheck_arg_parser v0.1.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking fuzzcheck_nix_subset v0.1.1
[INFO] [stderr] error[E0599]: no function or associated item named `from_entropy` found for struct `rand::rngs::small::SmallRng` in the current scope
[INFO] [stderr]    --> src/pool.rs:796:37
[INFO] [stderr]     |
[INFO] [stderr] 796 |             let mut rng = SmallRng::from_entropy();
[INFO] [stderr]     |                                     ^^^^^^^^^^^^ function or associated item not found in `rand::rngs::small::SmallRng`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `choose_multiple` found for struct `std::iter::Map<std::collections::btree_set::Iter<'_, &Feature>, [closure@src/pool.rs:808:26: 808:33]>` in the current scope
[INFO] [stderr]    --> src/pool.rs:809:22
[INFO] [stderr]     |
[INFO] [stderr] 809 |                     .choose_multiple(&mut rng, nbr_new_features);
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^ method not found in `std::iter::Map<std::collections::btree_set::Iter<'_, &Feature>, [closure@src/pool.rs:808:26: 808:33]>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `choose_multiple` found for struct `std::vec::Vec<data_structures::SlabKey<pool::FeatureInPool<pool::tests::VoidMutator>>>` in the current scope
[INFO] [stderr]    --> src/pool.rs:827:22
[INFO] [stderr]     |
[INFO] [stderr] 827 |                     .choose_multiple(&mut rng, nbr_existing_features)
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^ method not found in `std::vec::Vec<data_structures::SlabKey<pool::FeatureInPool<pool::tests::VoidMutator>>>`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::seq::SliceRandom`
[INFO] [stderr]    --> src/pool.rs:782:13
[INFO] [stderr]     |
[INFO] [stderr] 782 |         use rand::seq::SliceRandom;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `fuzzcheck`.
[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 `"docker" "inspect" "d4aadc89be23c78387b616d81af574bfd50b7fbfe2194317d5b5718164a60bed"`
[INFO] running `"docker" "rm" "-f" "d4aadc89be23c78387b616d81af574bfd50b7fbfe2194317d5b5718164a60bed"`
[INFO] [stdout] d4aadc89be23c78387b616d81af574bfd50b7fbfe2194317d5b5718164a60bed