[INFO] crate ethereum-trie-test 0.3.9 is already in cache
[INFO] testing ethereum-trie-test-0.3.9 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate ethereum-trie-test 0.3.9 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate ethereum-trie-test 0.3.9 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ethereum-trie-test 0.3.9
[INFO] finished tweaking crates.io crate ethereum-trie-test 0.3.9
[INFO] tweaked toml for crates.io crate ethereum-trie-test 0.3.9 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stdout] d24edf0c6979322433f8cbe5e2f03fcef298679273cd4cba5f83fd3441bcaf73
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "d24edf0c6979322433f8cbe5e2f03fcef298679273cd4cba5f83fd3441bcaf73"`
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling nodrop v0.1.14
[INFO] [stderr]    Compiling byte-tools v0.2.0
[INFO] [stderr]    Compiling ethereum-hexutil v0.2.3
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling elastic-array-plus v0.9.1
[INFO] [stderr]    Compiling ethereum-rlp v0.2.3
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling generic-array v0.8.3
[INFO] [stderr]    Compiling block-buffer v0.2.0
[INFO] [stderr]    Compiling digest v0.6.2
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling sha3 v0.6.0
[INFO] [stderr]    Compiling ethereum-bigint v0.2.9
[INFO] [stderr]    Compiling ethereum-trie-test v0.3.9 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]   --> src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]    |                ^^^^^  ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Decodable`, `Encodable`, `Prototype`
[INFO] [stderr]  --> src/merkle/nibble.rs:1:22
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rlp::{RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                      ^^^^^^^^^  ^^^^^^^^^       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/merkle/nibble.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hasher`
[INFO] [stderr]  --> src/merkle/nibble.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Formatter`, `self`
[INFO] [stderr]  --> src/merkle/nibble.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::{self, Debug, Formatter};
[INFO] [stderr]   |                ^^^^         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `Nibble`
[INFO] [stderr]  --> src/merkle/node.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use super::nibble::{self, Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                           ^^^^^^             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleType`, `NibbleVec`, `Nibble`
[INFO] [stderr]  --> src/merkle/mod.rs:4:20
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::nibble::{Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                    ^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::Trie`
[INFO] [stderr]  --> src/database/memory.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::Trie;
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseOwned`
[INFO] [stderr]  --> src/database/memory.rs:2:23
[INFO] [stderr]   |
[INFO] [stderr] 2 | use super::{Database, DatabaseOwned, DatabaseGuard};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Decodable`
[INFO] [stderr]  --> src/merkle/node.rs:3:39
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rlp::{self, RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:283:74
[INFO] [stderr]     |
[INFO] [stderr] 283 |             let submap = Self::build_submap(1, map.iter().filter(|&(key, value)| {
[INFO] [stderr]     |                                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:296:29
[INFO] [stderr]     |
[INFO] [stderr] 296 |             .filter(|&(key, value)| key.len() == 0).next()
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]    --> src/lib.rs:297:20
[INFO] [stderr]     |
[INFO] [stderr] 297 |             .map(|(key, value)| value.clone());
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_nodes`
[INFO] [stderr]    --> src/lib.rs:632:44
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_nodes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_additional`
[INFO] [stderr]    --> src/lib.rs:632:55
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_additional`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free`
[INFO] [stderr]   --> src/database/mod.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn free<'b>(&'b mut self, hash: H256) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `freed`
[INFO] [stderr]    --> src/database/mod.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     freed: Vec<H256>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.58s
[INFO] running `"docker" "inspect" "d24edf0c6979322433f8cbe5e2f03fcef298679273cd4cba5f83fd3441bcaf73"`
[INFO] running `"docker" "rm" "-f" "d24edf0c6979322433f8cbe5e2f03fcef298679273cd4cba5f83fd3441bcaf73"`
[INFO] [stdout] d24edf0c6979322433f8cbe5e2f03fcef298679273cd4cba5f83fd3441bcaf73
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+28742a1146f10a4f09369baad027a464acb7a766" "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] b780bcb6b8cb90e102277e1beda0346127cfea931cb7a433f0b8154217b1e551
[INFO] running `"docker" "start" "-a" "b780bcb6b8cb90e102277e1beda0346127cfea931cb7a433f0b8154217b1e551"`
[INFO] [stderr]    Compiling ethereum-trie-test v0.3.9 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]   --> src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]    |                ^^^^^  ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Decodable`, `Encodable`, `Prototype`
[INFO] [stderr]  --> src/merkle/nibble.rs:1:22
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rlp::{RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                      ^^^^^^^^^  ^^^^^^^^^       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/merkle/nibble.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hasher`
[INFO] [stderr]  --> src/merkle/nibble.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Formatter`, `self`
[INFO] [stderr]  --> src/merkle/nibble.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::{self, Debug, Formatter};
[INFO] [stderr]   |                ^^^^         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `Nibble`
[INFO] [stderr]  --> src/merkle/node.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use super::nibble::{self, Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                           ^^^^^^             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleType`, `NibbleVec`, `Nibble`
[INFO] [stderr]  --> src/merkle/mod.rs:4:20
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::nibble::{Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                    ^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::Trie`
[INFO] [stderr]  --> src/database/memory.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::Trie;
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseOwned`
[INFO] [stderr]  --> src/database/memory.rs:2:23
[INFO] [stderr]   |
[INFO] [stderr] 2 | use super::{Database, DatabaseOwned, DatabaseGuard};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Decodable`
[INFO] [stderr]  --> src/merkle/node.rs:3:39
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rlp::{self, RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:283:74
[INFO] [stderr]     |
[INFO] [stderr] 283 |             let submap = Self::build_submap(1, map.iter().filter(|&(key, value)| {
[INFO] [stderr]     |                                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:296:29
[INFO] [stderr]     |
[INFO] [stderr] 296 |             .filter(|&(key, value)| key.len() == 0).next()
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]    --> src/lib.rs:297:20
[INFO] [stderr]     |
[INFO] [stderr] 297 |             .map(|(key, value)| value.clone());
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_nodes`
[INFO] [stderr]    --> src/lib.rs:632:44
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_nodes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_additional`
[INFO] [stderr]    --> src/lib.rs:632:55
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_additional`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free`
[INFO] [stderr]   --> src/database/mod.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn free<'b>(&'b mut self, hash: H256) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `freed`
[INFO] [stderr]    --> src/database/mod.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     freed: Vec<H256>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]   --> src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]    |                ^^^^^  ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Decodable`, `Encodable`, `Prototype`
[INFO] [stderr]  --> src/merkle/nibble.rs:1:22
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rlp::{RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                      ^^^^^^^^^  ^^^^^^^^^       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/merkle/nibble.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hasher`
[INFO] [stderr]  --> src/merkle/nibble.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Formatter`, `self`
[INFO] [stderr]  --> src/merkle/nibble.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::{self, Debug, Formatter};
[INFO] [stderr]   |                ^^^^         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `Nibble`
[INFO] [stderr]  --> src/merkle/node.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use super::nibble::{self, Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                           ^^^^^^             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Keccak256`
[INFO] [stderr]    --> src/merkle/node.rs:157:24
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use sha3::{Digest, Keccak256};
[INFO] [stderr]     |                        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleVec`, `Nibble`
[INFO] [stderr]    --> src/merkle/node.rs:158:32
[INFO] [stderr]     |
[INFO] [stderr] 158 |     use merkle::nibble::{self, NibbleVec, NibbleSlice, Nibble};
[INFO] [stderr]     |                                ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleType`, `NibbleVec`, `Nibble`
[INFO] [stderr]  --> src/merkle/mod.rs:4:20
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::nibble::{Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                    ^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::Trie`
[INFO] [stderr]  --> src/database/memory.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::Trie;
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseOwned`
[INFO] [stderr]  --> src/database/memory.rs:2:23
[INFO] [stderr]   |
[INFO] [stderr] 2 | use super::{Database, DatabaseOwned, DatabaseGuard};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::UnsafeCell`
[INFO] [stderr]    --> src/lib.rs:726:9
[INFO] [stderr]     |
[INFO] [stderr] 726 |     use std::cell::UnsafeCell;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Decodable`
[INFO] [stderr]  --> src/merkle/node.rs:3:39
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rlp::{self, RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Digest`
[INFO] [stderr]    --> src/merkle/node.rs:157:16
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use sha3::{Digest, Keccak256};
[INFO] [stderr]     |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseGuard`
[INFO] [stderr]    --> src/lib.rs:723:17
[INFO] [stderr]     |
[INFO] [stderr] 723 |     use super::{DatabaseGuard, Trie};
[INFO] [stderr]     |                 ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:283:74
[INFO] [stderr]     |
[INFO] [stderr] 283 |             let submap = Self::build_submap(1, map.iter().filter(|&(key, value)| {
[INFO] [stderr]     |                                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:296:29
[INFO] [stderr]     |
[INFO] [stderr] 296 |             .filter(|&(key, value)| key.len() == 0).next()
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]    --> src/lib.rs:297:20
[INFO] [stderr]     |
[INFO] [stderr] 297 |             .map(|(key, value)| value.clone());
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_nodes`
[INFO] [stderr]    --> src/lib.rs:632:44
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_nodes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_additional`
[INFO] [stderr]    --> src/lib.rs:632:55
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_additional`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:740:13
[INFO] [stderr]     |
[INFO] [stderr] 740 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:756:13
[INFO] [stderr]     |
[INFO] [stderr] 756 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:776:13
[INFO] [stderr]     |
[INFO] [stderr] 776 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:801:13
[INFO] [stderr]     |
[INFO] [stderr] 801 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:812:13
[INFO] [stderr]     |
[INFO] [stderr] 812 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:825:13
[INFO] [stderr]     |
[INFO] [stderr] 825 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:841:13
[INFO] [stderr]     |
[INFO] [stderr] 841 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:843:13
[INFO] [stderr]     |
[INFO] [stderr] 843 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:854:13
[INFO] [stderr]     |
[INFO] [stderr] 854 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:856:13
[INFO] [stderr]     |
[INFO] [stderr] 856 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:869:13
[INFO] [stderr]     |
[INFO] [stderr] 869 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:871:13
[INFO] [stderr]     |
[INFO] [stderr] 871 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:872:13
[INFO] [stderr]     |
[INFO] [stderr] 872 |         let mut trie: Trie<HashMap<H256, Vec<u8>>> = Trie::build(database, &map);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free`
[INFO] [stderr]   --> src/database/mod.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn free<'b>(&'b mut self, hash: H256) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `freed`
[INFO] [stderr]    --> src/database/mod.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     freed: Vec<H256>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 35 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.94s
[INFO] running `"docker" "inspect" "b780bcb6b8cb90e102277e1beda0346127cfea931cb7a433f0b8154217b1e551"`
[INFO] running `"docker" "rm" "-f" "b780bcb6b8cb90e102277e1beda0346127cfea931cb7a433f0b8154217b1e551"`
[INFO] [stdout] b780bcb6b8cb90e102277e1beda0346127cfea931cb7a433f0b8154217b1e551
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+28742a1146f10a4f09369baad027a464acb7a766" "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] 29e9a2a92aacb81cfe17bc68401c5c3365782364f456898e3ee74c26eeaed364
[INFO] running `"docker" "start" "-a" "29e9a2a92aacb81cfe17bc68401c5c3365782364f456898e3ee74c26eeaed364"`
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]   --> src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]    |                ^^^^^  ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Decodable`, `Encodable`, `Prototype`
[INFO] [stderr]  --> src/merkle/nibble.rs:1:22
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rlp::{RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                      ^^^^^^^^^  ^^^^^^^^^       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]   --> src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]    |                ^^^^^  ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Decodable`, `Encodable`, `Prototype`
[INFO] [stderr]  --> src/merkle/nibble.rs:1:22
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rlp::{RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                      ^^^^^^^^^  ^^^^^^^^^       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/merkle/nibble.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hasher`
[INFO] [stderr]  --> src/merkle/nibble.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Formatter`, `self`
[INFO] [stderr]  --> src/merkle/nibble.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::{self, Debug, Formatter};
[INFO] [stderr]   |                ^^^^         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `Nibble`
[INFO] [stderr]  --> src/merkle/node.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use super::nibble::{self, Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                           ^^^^^^             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleType`, `NibbleVec`, `Nibble`
[INFO] [stderr]  --> src/merkle/mod.rs:4:20
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::nibble::{Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                    ^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::Trie`
[INFO] [stderr]  --> src/database/memory.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::Trie;
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseOwned`
[INFO] [stderr]  --> src/database/memory.rs:2:23
[INFO] [stderr]   |
[INFO] [stderr] 2 | use super::{Database, DatabaseOwned, DatabaseGuard};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Decodable`
[INFO] [stderr]  --> src/merkle/node.rs:3:39
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rlp::{self, RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:283:74
[INFO] [stderr]     |
[INFO] [stderr] 283 |             let submap = Self::build_submap(1, map.iter().filter(|&(key, value)| {
[INFO] [stderr]     |                                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:296:29
[INFO] [stderr]     |
[INFO] [stderr] 296 |             .filter(|&(key, value)| key.len() == 0).next()
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]    --> src/lib.rs:297:20
[INFO] [stderr]     |
[INFO] [stderr] 297 |             .map(|(key, value)| value.clone());
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_nodes`
[INFO] [stderr]    --> src/lib.rs:632:44
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_nodes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_additional`
[INFO] [stderr]    --> src/lib.rs:632:55
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_additional`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free`
[INFO] [stderr]   --> src/database/mod.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn free<'b>(&'b mut self, hash: H256) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `freed`
[INFO] [stderr]    --> src/database/mod.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     freed: Vec<H256>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/merkle/nibble.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hasher`
[INFO] [stderr]  --> src/merkle/nibble.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Formatter`, `self`
[INFO] [stderr]  --> src/merkle/nibble.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::{self, Debug, Formatter};
[INFO] [stderr]   |                ^^^^         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `Nibble`
[INFO] [stderr]  --> src/merkle/node.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use super::nibble::{self, Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                           ^^^^^^             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Keccak256`
[INFO] [stderr]    --> src/merkle/node.rs:157:24
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use sha3::{Digest, Keccak256};
[INFO] [stderr]     |                        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleVec`, `Nibble`
[INFO] [stderr]    --> src/merkle/node.rs:158:32
[INFO] [stderr]     |
[INFO] [stderr] 158 |     use merkle::nibble::{self, NibbleVec, NibbleSlice, Nibble};
[INFO] [stderr]     |                                ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `NibbleSlice`, `NibbleType`, `NibbleVec`, `Nibble`
[INFO] [stderr]  --> src/merkle/mod.rs:4:20
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::nibble::{Nibble, NibbleVec, NibbleSlice, NibbleType};
[INFO] [stderr]   |                    ^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::Trie`
[INFO] [stderr]  --> src/database/memory.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::Trie;
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseOwned`
[INFO] [stderr]  --> src/database/memory.rs:2:23
[INFO] [stderr]   |
[INFO] [stderr] 2 | use super::{Database, DatabaseOwned, DatabaseGuard};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::UnsafeCell`
[INFO] [stderr]    --> src/lib.rs:726:9
[INFO] [stderr]     |
[INFO] [stderr] 726 |     use std::cell::UnsafeCell;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Decodable`
[INFO] [stderr]  --> src/merkle/node.rs:3:39
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rlp::{self, RlpStream, Encodable, Decodable, Rlp, Prototype};
[INFO] [stderr]   |                                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Digest`
[INFO] [stderr]    --> src/merkle/node.rs:157:16
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use sha3::{Digest, Keccak256};
[INFO] [stderr]     |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DatabaseGuard`
[INFO] [stderr]    --> src/lib.rs:723:17
[INFO] [stderr]     |
[INFO] [stderr] 723 |     use super::{DatabaseGuard, Trie};
[INFO] [stderr]     |                 ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:283:74
[INFO] [stderr]     |
[INFO] [stderr] 283 |             let submap = Self::build_submap(1, map.iter().filter(|&(key, value)| {
[INFO] [stderr]     |                                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:296:29
[INFO] [stderr]     |
[INFO] [stderr] 296 |             .filter(|&(key, value)| key.len() == 0).next()
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]    --> src/lib.rs:297:20
[INFO] [stderr]     |
[INFO] [stderr] 297 |             .map(|(key, value)| value.clone());
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_nodes`
[INFO] [stderr]    --> src/lib.rs:632:44
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_nodes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_additional`
[INFO] [stderr]    --> src/lib.rs:632:55
[INFO] [stderr]     |
[INFO] [stderr] 632 |                         MerkleNode::Branch(sub_nodes, sub_additional) => {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sub_additional`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:740:13
[INFO] [stderr]     |
[INFO] [stderr] 740 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:756:13
[INFO] [stderr]     |
[INFO] [stderr] 756 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:776:13
[INFO] [stderr]     |
[INFO] [stderr] 776 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:801:13
[INFO] [stderr]     |
[INFO] [stderr] 801 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:812:13
[INFO] [stderr]     |
[INFO] [stderr] 812 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:825:13
[INFO] [stderr]     |
[INFO] [stderr] 825 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:841:13
[INFO] [stderr]     |
[INFO] [stderr] 841 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:843:13
[INFO] [stderr]     |
[INFO] [stderr] 843 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:854:13
[INFO] [stderr]     |
[INFO] [stderr] 854 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:856:13
[INFO] [stderr]     |
[INFO] [stderr] 856 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:869:13
[INFO] [stderr]     |
[INFO] [stderr] 869 |         let mut map = HashMap::new();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:871:13
[INFO] [stderr]     |
[INFO] [stderr] 871 |         let mut database: HashMap<H256, Vec<u8>> = HashMap::new();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:872:13
[INFO] [stderr]     |
[INFO] [stderr] 872 |         let mut trie: Trie<HashMap<H256, Vec<u8>>> = Trie::build(database, &map);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free`
[INFO] [stderr]   --> src/database/mod.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn free<'b>(&'b mut self, hash: H256) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `freed`
[INFO] [stderr]    --> src/database/mod.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     freed: Vec<H256>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 35 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/trie_test-29575850eb92ffc7
[INFO] [stdout] running 12 tests
[INFO] [stdout] test tests::insert_animals ... ok
[INFO] [stdout] test merkle::nibble::tests::from_into_key ... ok
[INFO] [stdout] test merkle::node::tests::encode_decode ... ok
[INFO] [stdout] test merkle::node::tests::decode_genesis_state ... ok
[INFO] [stdout] test tests::insert_single_item ... ok
[INFO] [stdout] test tests::trie_middle_leaf ... ok
[INFO] [stdout] test tests::insert_middle_leaf ... ok
[INFO] [stdout] test tests::trie_empty ... ok
[INFO] [stdout] test tests::trie_delete ... ok
[INFO] [stdout] test tests::sub_genesis ... ok
[INFO] [stdout] test tests::trie_insert ... ok
[INFO] [stdout] test tests::testy ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests trie_test
[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" "29e9a2a92aacb81cfe17bc68401c5c3365782364f456898e3ee74c26eeaed364"`
[INFO] running `"docker" "rm" "-f" "29e9a2a92aacb81cfe17bc68401c5c3365782364f456898e3ee74c26eeaed364"`
[INFO] [stdout] 29e9a2a92aacb81cfe17bc68401c5c3365782364f456898e3ee74c26eeaed364