[INFO] fetching crate merkle_trees 0.1.0...
[INFO] testing merkle_trees-0.1.0 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate merkle_trees 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate merkle_trees 0.1.0 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate merkle_trees 0.1.0
[INFO] finished tweaking crates.io crate merkle_trees 0.1.0
[INFO] tweaked toml for crates.io crate merkle_trees 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mimc-rs v0.0.2
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d1934a9ce33d27fc14aa94479830c17d842f4810e87e70a458c74881d65a65b7
[INFO] running `"docker" "start" "-a" "d1934a9ce33d27fc14aa94479830c17d842f4810e87e70a458c74881d65a65b7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling gimli v0.21.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]    Compiling object v0.19.0
[INFO] [stderr]    Compiling rustc-hex v2.1.0
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling arrayvec v0.5.1
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling rlp v0.4.5
[INFO] [stderr]    Compiling sha2 v0.8.2
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr]    Compiling addr2line v0.12.1
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling backtrace v0.3.48
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling merkle_trees v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:284:28
[INFO] [stderr]     |
[INFO] [stderr] 284 |                     idx += (p - 1);
[INFO] [stderr]     |                            ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:834:29
[INFO] [stderr]     |
[INFO] [stderr] 834 |         let last_leaf_idx = (size - 1);
[INFO] [stderr]     |                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::FromIterator`
[INFO] [stderr]  --> src/db.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::iter::FromIterator;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::hasher::Arity2Hasher`
[INFO] [stderr]  --> src/merkle_patricia_trie.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::hasher::Arity2Hasher;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::types::LeafIndex`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use crate::types::LeafIndex;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/types.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::identities::Zero`
[INFO] [stderr]  --> src/types.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use num_traits::identities::Zero;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_leaf`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn is_leaf(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_extension`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn is_extension(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `reset_root`
[INFO] [stderr]     --> src/merkle_patricia_trie.rs:1373:8
[INFO] [stderr]      |
[INFO] [stderr] 1373 |     fn reset_root(&mut self) {
[INFO] [stderr]      |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 55.73s
[INFO] running `"docker" "inspect" "d1934a9ce33d27fc14aa94479830c17d842f4810e87e70a458c74881d65a65b7"`
[INFO] running `"docker" "rm" "-f" "d1934a9ce33d27fc14aa94479830c17d842f4810e87e70a458c74881d65a65b7"`
[INFO] [stdout] d1934a9ce33d27fc14aa94479830c17d842f4810e87e70a458c74881d65a65b7
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d7f5ce10366997329664bf0d61a0215bc4379c03f2d1b093b537f5472af59581
[INFO] running `"docker" "start" "-a" "d7f5ce10366997329664bf0d61a0215bc4379c03f2d1b093b537f5472af59581"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling bindgen v0.49.4
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling rustc-hex v1.0.0
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling clang-sys v0.28.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling paste-impl v0.1.16
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling bincode v1.2.1
[INFO] [stderr]    Compiling serde_bytes v0.11.4
[INFO] [stderr]    Compiling tiny-keccak v1.5.0
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:284:28
[INFO] [stderr]     |
[INFO] [stderr] 284 |                     idx += (p - 1);
[INFO] [stderr]     |                            ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:834:29
[INFO] [stderr]     |
[INFO] [stderr] 834 |         let last_leaf_idx = (size - 1);
[INFO] [stderr]     |                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::FromIterator`
[INFO] [stderr]  --> src/db.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::iter::FromIterator;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::hasher::Arity2Hasher`
[INFO] [stderr]  --> src/merkle_patricia_trie.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::hasher::Arity2Hasher;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::types::LeafIndex`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use crate::types::LeafIndex;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/types.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::identities::Zero`
[INFO] [stderr]  --> src/types.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use num_traits::identities::Zero;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_leaf`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn is_leaf(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_extension`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn is_extension(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `reset_root`
[INFO] [stderr]     --> src/merkle_patricia_trie.rs:1373:8
[INFO] [stderr]      |
[INFO] [stderr] 1373 |     fn reset_root(&mut self) {
[INFO] [stderr]      |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling num v0.2.1
[INFO] [stderr]    Compiling mimc-rs v0.0.2
[INFO] [stderr]    Compiling sled v0.29.2
[INFO] [stderr]    Compiling paste v0.1.16
[INFO] [stderr]    Compiling cexpr v0.3.6
[INFO] [stderr]    Compiling unqlite v1.4.3
[INFO] [stderr]    Compiling merkle_trees v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:284:28
[INFO] [stderr]     |
[INFO] [stderr] 284 |                     idx += (p - 1);
[INFO] [stderr]     |                            ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:834:29
[INFO] [stderr]     |
[INFO] [stderr] 834 |         let last_leaf_idx = (size - 1);
[INFO] [stderr]     |                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::FromIterator`
[INFO] [stderr]  --> src/db.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::iter::FromIterator;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BigInt`
[INFO] [stderr]   --> src/hasher.rs:85:22
[INFO] [stderr]    |
[INFO] [stderr] 85 |     use num_bigint::{BigInt, BigUint, ToBigInt};
[INFO] [stderr]    |                      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::hasher::Arity2Hasher`
[INFO] [stderr]  --> src/merkle_patricia_trie.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::hasher::Arity2Hasher;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::types::LeafIndex`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use crate::types::LeafIndex;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::sha2::Sha256`
[INFO] [stderr]    --> src/sparse_merkle_tree.rs:395:9
[INFO] [stderr]     |
[INFO] [stderr] 395 |     use crate::sha2::Sha256;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/types.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::identities::Zero`
[INFO] [stderr]  --> src/types.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use num_traits::identities::Zero;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]    --> src/vanilla_sparse_merkle_tree.rs:344:34
[INFO] [stderr]     |
[INFO] [stderr] 344 |     use self::rand::{thread_rng, Rng};
[INFO] [stderr]     |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::Pow`
[INFO] [stderr]    --> src/sparse_merkle_tree.rs:404:9
[INFO] [stderr]     |
[INFO] [stderr] 404 |     use num_traits::Pow;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1063:13
[INFO] [stderr]      |
[INFO] [stderr] 1063 |         let tree = CompactMerkleTree::new(hasher.clone());
[INFO] [stderr]      |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `h_l_6`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1125:13
[INFO] [stderr]      |
[INFO] [stderr] 1125 |         let h_l_6 = hasher.hash_leaf(l_6).unwrap();
[INFO] [stderr]      |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_h_l_6`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path_4`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1220:13
[INFO] [stderr]      |
[INFO] [stderr] 1220 |         let path_4 = tree.append(l_4, &mut db).unwrap();
[INFO] [stderr]      |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_path_4`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path_5`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1231:13
[INFO] [stderr]      |
[INFO] [stderr] 1231 |         let path_5 = tree.append(l_5, &mut db).unwrap();
[INFO] [stderr]      |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_path_5`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `reset_root`
[INFO] [stderr]     --> src/merkle_patricia_trie.rs:1373:8
[INFO] [stderr]      |
[INFO] [stderr] 1373 |     fn reset_root(&mut self) {
[INFO] [stderr]      |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1m 14s
[INFO] running `"docker" "inspect" "d7f5ce10366997329664bf0d61a0215bc4379c03f2d1b093b537f5472af59581"`
[INFO] running `"docker" "rm" "-f" "d7f5ce10366997329664bf0d61a0215bc4379c03f2d1b093b537f5472af59581"`
[INFO] [stdout] d7f5ce10366997329664bf0d61a0215bc4379c03f2d1b093b537f5472af59581
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2328f2410ffce6fecfd0ac2204221c615be0cf473f9b591a923306c4299c93cd
[INFO] running `"docker" "start" "-a" "2328f2410ffce6fecfd0ac2204221c615be0cf473f9b591a923306c4299c93cd"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:284:28
[INFO] [stderr]     |
[INFO] [stderr] 284 |                     idx += (p - 1);
[INFO] [stderr]     |                            ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:834:29
[INFO] [stderr]     |
[INFO] [stderr] 834 |         let last_leaf_idx = (size - 1);
[INFO] [stderr]     |                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::FromIterator`
[INFO] [stderr]  --> src/db.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::iter::FromIterator;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::hasher::Arity2Hasher`
[INFO] [stderr]  --> src/merkle_patricia_trie.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::hasher::Arity2Hasher;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::types::LeafIndex`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use crate::types::LeafIndex;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/types.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::identities::Zero`
[INFO] [stderr]  --> src/types.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use num_traits::identities::Zero;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_leaf`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn is_leaf(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_extension`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn is_extension(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `reset_root`
[INFO] [stderr]     --> src/merkle_patricia_trie.rs:1373:8
[INFO] [stderr]      |
[INFO] [stderr] 1373 |     fn reset_root(&mut self) {
[INFO] [stderr]      |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:284:28
[INFO] [stderr]     |
[INFO] [stderr] 284 |                     idx += (p - 1);
[INFO] [stderr]     |                            ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/compact_merkle_tree.rs:834:29
[INFO] [stderr]     |
[INFO] [stderr] 834 |         let last_leaf_idx = (size - 1);
[INFO] [stderr]     |                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::FromIterator`
[INFO] [stderr]  --> src/db.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::iter::FromIterator;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BigInt`
[INFO] [stderr]   --> src/hasher.rs:85:22
[INFO] [stderr]    |
[INFO] [stderr] 85 |     use num_bigint::{BigInt, BigUint, ToBigInt};
[INFO] [stderr]    |                      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::hasher::Arity2Hasher`
[INFO] [stderr]  --> src/merkle_patricia_trie.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::hasher::Arity2Hasher;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::types::LeafIndex`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use crate::types::LeafIndex;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::sha2::Sha256`
[INFO] [stderr]    --> src/sparse_merkle_tree.rs:395:9
[INFO] [stderr]     |
[INFO] [stderr] 395 |     use crate::sha2::Sha256;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/types.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::identities::Zero`
[INFO] [stderr]  --> src/types.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use num_traits::identities::Zero;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]    --> src/vanilla_sparse_merkle_tree.rs:344:34
[INFO] [stderr]     |
[INFO] [stderr] 344 |     use self::rand::{thread_rng, Rng};
[INFO] [stderr]     |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `num_traits::Pow`
[INFO] [stderr]    --> src/sparse_merkle_tree.rs:404:9
[INFO] [stderr]     |
[INFO] [stderr] 404 |     use num_traits::Pow;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1063:13
[INFO] [stderr]      |
[INFO] [stderr] 1063 |         let tree = CompactMerkleTree::new(hasher.clone());
[INFO] [stderr]      |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `h_l_6`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1125:13
[INFO] [stderr]      |
[INFO] [stderr] 1125 |         let h_l_6 = hasher.hash_leaf(l_6).unwrap();
[INFO] [stderr]      |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_h_l_6`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path_4`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1220:13
[INFO] [stderr]      |
[INFO] [stderr] 1220 |         let path_4 = tree.append(l_4, &mut db).unwrap();
[INFO] [stderr]      |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_path_4`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path_5`
[INFO] [stderr]     --> src/compact_merkle_tree.rs:1231:13
[INFO] [stderr]      |
[INFO] [stderr] 1231 |         let path_5 = tree.append(l_5, &mut db).unwrap();
[INFO] [stderr]      |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_path_5`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/merkle_patricia_trie.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `reset_root`
[INFO] [stderr]     --> src/merkle_patricia_trie.rs:1373:8
[INFO] [stderr]      |
[INFO] [stderr] 1373 |     fn reset_root(&mut self) {
[INFO] [stderr]      |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.39s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/merkle_trees-f8f84a1d22b1af2b
[INFO] [stdout] 
[INFO] [stdout] running 41 tests
[INFO] [stdout] test compact_merkle_tree::tests::test_break_in_powers_of_2 ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_append ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_least_significant_set_bit ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_num_bits ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_get_subtree_root_index ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_largest_power_of_2_less_than ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_count_set_bits ... ok
[INFO] [stdout] test db::tests::test_in_memory_db_string_val ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_inner_border_split ... ok
[INFO] [stdout] test hasher::tests::test_sha256_arity_4_hasher ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::node_serializer_empty_key_or_values ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_hash_db ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_hash_leaves ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::node_serializer ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_verify_leaf_inclusion_path ... ok
[INFO] [stdout] test hasher::tests::test_sha256_arity_2_hasher ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_updating_extension_node ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::test_nibbles_bytes_conversion ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::node_serializer_nested_nodes ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_create_tree_from_hash_db ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_updating_leaf_node ... ok
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_sha256_string_repeat_vals ... ok
[INFO] [stdout] test types::tests::test_equivalence_of_u64_and_BigUint ... ok
[INFO] [stdout] test types::tests::test_leaf_path ... ok
[INFO] [stdout] test types::tests::test_leaf_path_1 ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_extend_and_verify_proof ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_init ... ok
[INFO] [stdout] test vanilla_sparse_merkle_tree::tests::test_vanilla_binary_sparse_tree_sha256_string ... ok
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_sha256_string ... ok
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_sha256_string_repeated ... ok
[INFO] [stdout] test hasher::tests::test_mimc_arity_2_hasher ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_append_and_verify_proof ... ok
[INFO] [stdout] test compact_merkle_tree::tests::test_consistency_proof ... ok
[INFO] [stdout] test vanilla_sparse_merkle_tree::tests::test_vanilla_sparse_4_ary_tree_sha256_string ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_get_key_vals ... ok
[INFO] [stdout] test vanilla_sparse_merkle_tree::tests::test_vanilla_binary_sparse_tree_sha256_string_BigUint_index ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_proof ... ok
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_sha256_string_BigUint_index ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_get_prefix_key_vals ... ok
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_random_vals ... test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_random_vals has been running for over 60 seconds
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_mimc_BigUint ... test sparse_merkle_tree::tests::test_binary_tree_mimc_BigUint has been running for over 60 seconds
[INFO] [stdout] test merkle_patricia_trie::tests::patricia_trie_sha3_rlp_random_vals ... ok
[INFO] [stdout] test sparse_merkle_tree::tests::test_binary_tree_mimc_BigUint ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 41 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests merkle_trees
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2328f2410ffce6fecfd0ac2204221c615be0cf473f9b591a923306c4299c93cd"`
[INFO] running `"docker" "rm" "-f" "2328f2410ffce6fecfd0ac2204221c615be0cf473f9b591a923306c4299c93cd"`
[INFO] [stdout] 2328f2410ffce6fecfd0ac2204221c615be0cf473f9b591a923306c4299c93cd