[INFO] fetching crate ethereum-trie 0.5.0...
[INFO] checking ethereum-trie-0.5.0 against master#80399064afa4a2cd153f30d02c25f7ea0383ed65 for opaque-soundness-fix
[INFO] extracting crate ethereum-trie 0.5.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate ethereum-trie 0.5.0 on toolchain 80399064afa4a2cd153f30d02c25f7ea0383ed65
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ethereum-trie 0.5.0
[INFO] finished tweaking crates.io crate ethereum-trie 0.5.0
[INFO] tweaked toml for crates.io crate ethereum-trie 0.5.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ethereum-bigint v0.2.9
[INFO] [stderr]   Downloaded ethereum-hexutil v0.2.3
[INFO] [stderr]   Downloaded elastic-array-plus v0.9.1
[INFO] [stderr]   Downloaded ethereum-rlp v0.2.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9d8293e1819e91a3989c8b287c60176c40f4ec9e7d514ab51a790c55d73c5fa5
[INFO] running `Command { std: "docker" "start" "-a" "9d8293e1819e91a3989c8b287c60176c40f4ec9e7d514ab51a790c55d73c5fa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d8293e1819e91a3989c8b287c60176c40f4ec9e7d514ab51a790c55d73c5fa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d8293e1819e91a3989c8b287c60176c40f4ec9e7d514ab51a790c55d73c5fa5", kill_on_drop: false }`
[INFO] [stdout] 9d8293e1819e91a3989c8b287c60176c40f4ec9e7d514ab51a790c55d73c5fa5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 19bd92ab57f201dd0ade2a8668f5cb0e2f41d20d2b9bc0f7d8a002b91b413b71
[INFO] running `Command { std: "docker" "start" "-a" "19bd92ab57f201dd0ade2a8668f5cb0e2f41d20d2b9bc0f7d8a002b91b413b71", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking elastic-array-plus v0.9.1
[INFO] [stderr]     Checking byte-tools v0.2.0
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking ethereum-hexutil v0.2.3
[INFO] [stderr]     Checking ethereum-rlp v0.2.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking generic-array v0.8.4
[INFO] [stderr]     Checking block-buffer v0.2.0
[INFO] [stderr]     Checking digest v0.6.1
[INFO] [stderr]     Checking sha3 v0.6.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking ethereum-bigint v0.2.9
[INFO] [stderr]     Checking ethereum-trie v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]  --> src/merkle/node.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rlp::{self, RlpStream, Encodable, Rlp, Prototype};
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate rlp;
[INFO] [stdout]   | ----------------- the item `rlp` is already imported here
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/lib.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![deny(unused_import_braces, unused_imports,
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]  --> src/merkle/node.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rlp::{self, RlpStream, Encodable, Rlp, Prototype};
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate rlp;
[INFO] [stdout]   | ----------------- the item `rlp` is already imported here
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/lib.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![deny(unused_import_braces, unused_imports,
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]    --> src/merkle/node.rs:161:15
[INFO] [stdout]     |
[INFO] [stdout] 161 |     use rlp::{self, Rlp};
[INFO] [stdout]     |               ^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:9:1
[INFO] [stdout]     |
[INFO] [stdout] 9   | extern crate rlp;
[INFO] [stdout]     | ----------------- the item `rlp` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/merkle/node.rs:63:55
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 MerkleNode::Leaf(nibble.clone(), value.clone())
[INFO] [stdout]    |                                                       ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:12:54
[INFO] [stdout]    |
[INFO] [stdout] 12 |         submap.insert(key[common_len..].into(), value.clone());
[INFO] [stdout]    |                                                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:30:68
[INFO] [stdout]    |
[INFO] [stdout] 30 |         return (MerkleNode::Leaf(key.clone(), map.get(key).unwrap().clone()), change);
[INFO] [stdout]    |                                                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:70:39
[INFO] [stdout]    |
[INFO] [stdout] 70 |             .map(|(_key, value)| value.clone());
[INFO] [stdout]    |                                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/merkle/node.rs:63:55
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 MerkleNode::Leaf(nibble.clone(), value.clone())
[INFO] [stdout]    |                                                       ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:12:54
[INFO] [stdout]    |
[INFO] [stdout] 12 |         submap.insert(key[common_len..].into(), value.clone());
[INFO] [stdout]    |                                                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:30:68
[INFO] [stdout]    |
[INFO] [stdout] 30 |         return (MerkleNode::Leaf(key.clone(), map.get(key).unwrap().clone()), change);
[INFO] [stdout]    |                                                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:70:39
[INFO] [stdout]    |
[INFO] [stdout] 70 |             .map(|(_key, value)| value.clone());
[INFO] [stdout]    |                                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ethereum-trie` (lib) due to 2 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ethereum-trie` (lib test) due to 3 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "19bd92ab57f201dd0ade2a8668f5cb0e2f41d20d2b9bc0f7d8a002b91b413b71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19bd92ab57f201dd0ade2a8668f5cb0e2f41d20d2b9bc0f7d8a002b91b413b71", kill_on_drop: false }`
[INFO] [stdout] 19bd92ab57f201dd0ade2a8668f5cb0e2f41d20d2b9bc0f7d8a002b91b413b71
[INFO] checking ethereum-trie-0.5.0 against master#09bc67b9158392361780e779d32997f14cc75c39 for opaque-soundness-fix
[INFO] extracting crate ethereum-trie 0.5.0 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate ethereum-trie 0.5.0 on toolchain 09bc67b9158392361780e779d32997f14cc75c39
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+09bc67b9158392361780e779d32997f14cc75c39" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ethereum-trie 0.5.0
[INFO] finished tweaking crates.io crate ethereum-trie 0.5.0
[INFO] tweaked toml for crates.io crate ethereum-trie 0.5.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+09bc67b9158392361780e779d32997f14cc75c39" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+09bc67b9158392361780e779d32997f14cc75c39" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+09bc67b9158392361780e779d32997f14cc75c39" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c91e34a9b0e0065aec402f256c53f0854f197f36aa7194d1c1d9d17842688244
[INFO] running `Command { std: "docker" "start" "-a" "c91e34a9b0e0065aec402f256c53f0854f197f36aa7194d1c1d9d17842688244", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c91e34a9b0e0065aec402f256c53f0854f197f36aa7194d1c1d9d17842688244", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c91e34a9b0e0065aec402f256c53f0854f197f36aa7194d1c1d9d17842688244", kill_on_drop: false }`
[INFO] [stdout] c91e34a9b0e0065aec402f256c53f0854f197f36aa7194d1c1d9d17842688244
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+09bc67b9158392361780e779d32997f14cc75c39" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61a901ed3865b150cc0abaddca875e7dcd8c907363c0c5d839d595b33ffc4544
[INFO] running `Command { std: "docker" "start" "-a" "61a901ed3865b150cc0abaddca875e7dcd8c907363c0c5d839d595b33ffc4544", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking ethereum-hexutil v0.2.3
[INFO] [stderr]     Checking elastic-array-plus v0.9.1
[INFO] [stderr]     Checking byte-tools v0.2.0
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking ethereum-rlp v0.2.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking generic-array v0.8.4
[INFO] [stderr]     Checking digest v0.6.1
[INFO] [stderr]     Checking block-buffer v0.2.0
[INFO] [stderr]     Checking sha3 v0.6.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking ethereum-bigint v0.2.9
[INFO] [stderr]     Checking ethereum-trie v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]  --> src/merkle/node.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rlp::{self, RlpStream, Encodable, Rlp, Prototype};
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate rlp;
[INFO] [stdout]   | ----------------- the item `rlp` is already imported here
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/lib.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![deny(unused_import_braces, unused_imports,
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]  --> src/merkle/node.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rlp::{self, RlpStream, Encodable, Rlp, Prototype};
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate rlp;
[INFO] [stdout]   | ----------------- the item `rlp` is already imported here
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/lib.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![deny(unused_import_braces, unused_imports,
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `rlp` is imported redundantly
[INFO] [stdout]    --> src/merkle/node.rs:161:15
[INFO] [stdout]     |
[INFO] [stdout] 161 |     use rlp::{self, Rlp};
[INFO] [stdout]     |               ^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:9:1
[INFO] [stdout]     |
[INFO] [stdout] 9   | extern crate rlp;
[INFO] [stdout]     | ----------------- the item `rlp` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/merkle/node.rs:63:55
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 MerkleNode::Leaf(nibble.clone(), value.clone())
[INFO] [stdout]    |                                                       ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:12:54
[INFO] [stdout]    |
[INFO] [stdout] 12 |         submap.insert(key[common_len..].into(), value.clone());
[INFO] [stdout]    |                                                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:30:68
[INFO] [stdout]    |
[INFO] [stdout] 30 |         return (MerkleNode::Leaf(key.clone(), map.get(key).unwrap().clone()), change);
[INFO] [stdout]    |                                                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:70:39
[INFO] [stdout]    |
[INFO] [stdout] 70 |             .map(|(_key, value)| value.clone());
[INFO] [stdout]    |                                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/merkle/node.rs:63:55
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 MerkleNode::Leaf(nibble.clone(), value.clone())
[INFO] [stdout]    |                                                       ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:12:54
[INFO] [stdout]    |
[INFO] [stdout] 12 |         submap.insert(key[common_len..].into(), value.clone());
[INFO] [stdout]    |                                                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ethereum-trie` (lib) due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:30:68
[INFO] [stdout]    |
[INFO] [stdout] 30 |         return (MerkleNode::Leaf(key.clone(), map.get(key).unwrap().clone()), change);
[INFO] [stdout]    |                                                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&[u8]` instead of cloning the inner type
[INFO] [stdout]   --> src/ops/build.rs:70:39
[INFO] [stdout]    |
[INFO] [stdout] 70 |             .map(|(_key, value)| value.clone());
[INFO] [stdout]    |                                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ethereum-trie` (lib test) due to 3 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "61a901ed3865b150cc0abaddca875e7dcd8c907363c0c5d839d595b33ffc4544", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61a901ed3865b150cc0abaddca875e7dcd8c907363c0c5d839d595b33ffc4544", kill_on_drop: false }`
[INFO] [stdout] 61a901ed3865b150cc0abaddca875e7dcd8c907363c0c5d839d595b33ffc4544
