[INFO] fetching crate double_linkedlist 0.1.2...
[INFO] testing double_linkedlist-0.1.2 against 1.60.0 for beta-1.61-1
[INFO] extracting crate double_linkedlist 0.1.2 into /workspace/builds/worker-105/source
[INFO] validating manifest of crates.io crate double_linkedlist 0.1.2 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate double_linkedlist 0.1.2
[INFO] finished tweaking crates.io crate double_linkedlist 0.1.2
[INFO] tweaked toml for crates.io crate double_linkedlist 0.1.2 written to /workspace/builds/worker-105/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a8f97dddb9e692c7edb3415d5f06c74a2e793cd56d6216bd80e5e7e864bef0a
[INFO] running `Command { std: "docker" "start" "-a" "5a8f97dddb9e692c7edb3415d5f06c74a2e793cd56d6216bd80e5e7e864bef0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a8f97dddb9e692c7edb3415d5f06c74a2e793cd56d6216bd80e5e7e864bef0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a8f97dddb9e692c7edb3415d5f06c74a2e793cd56d6216bd80e5e7e864bef0a", kill_on_drop: false }`
[INFO] [stdout] 5a8f97dddb9e692c7edb3415d5f06c74a2e793cd56d6216bd80e5e7e864bef0a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea78b36420c3bcf8589030abb692a03ff8338d7d67b365dd1c12feb26ef27961
[INFO] running `Command { std: "docker" "start" "-a" "ea78b36420c3bcf8589030abb692a03ff8338d7d67b365dd1c12feb26ef27961", kill_on_drop: false }`
[INFO] [stderr]    Compiling double_linkedlist v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `Double_Node` should have an upper camel case name
[INFO] [stdout]  --> src/lib.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Double_Node {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleNode`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Double_LinkedList {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedList`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList_Iterator` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:83:12
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub struct Double_LinkedList_Iterator {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedListIterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/lib.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut result = None;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.01s
[INFO] running `Command { std: "docker" "inspect" "ea78b36420c3bcf8589030abb692a03ff8338d7d67b365dd1c12feb26ef27961", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea78b36420c3bcf8589030abb692a03ff8338d7d67b365dd1c12feb26ef27961", kill_on_drop: false }`
[INFO] [stdout] ea78b36420c3bcf8589030abb692a03ff8338d7d67b365dd1c12feb26ef27961
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8cdacc0740a8a3129313a189c69ccfe3feacc4899808f188f1e393568e6ad42b
[INFO] running `Command { std: "docker" "start" "-a" "8cdacc0740a8a3129313a189c69ccfe3feacc4899808f188f1e393568e6ad42b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stdout] warning: type `Double_Node` should have an upper camel case name
[INFO] [stdout]  --> src/lib.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Double_Node {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleNode`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Double_LinkedList {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedList`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList_Iterator` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:83:12
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub struct Double_LinkedList_Iterator {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedListIterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/lib.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut result = None;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling double_linkedlist v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_Node` should have an upper camel case name
[INFO] [stdout]  --> src/lib.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Double_Node {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleNode`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Double_LinkedList {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedList`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Double_LinkedList_Iterator` should have an upper camel case name
[INFO] [stdout]   --> src/lib.rs:83:12
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub struct Double_LinkedList_Iterator {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedListIterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/lib.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut result = None;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test_double_node`
[INFO] [stdout]    --> src/lib.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |         let mut test_double_node = Double_Node::new(10);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_test_double_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:120:13
[INFO] [stdout]     |
[INFO] [stdout] 120 |         let mut test_double_node = Double_Node::new(10);
[INFO] [stdout]     |             ----^^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "8cdacc0740a8a3129313a189c69ccfe3feacc4899808f188f1e393568e6ad42b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cdacc0740a8a3129313a189c69ccfe3feacc4899808f188f1e393568e6ad42b", kill_on_drop: false }`
[INFO] [stdout] 8cdacc0740a8a3129313a189c69ccfe3feacc4899808f188f1e393568e6ad42b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b6e60c05af162ccb195f5a63c62ddd9215461cf443b1c43ae5590891dff02c73
[INFO] running `Command { std: "docker" "start" "-a" "b6e60c05af162ccb195f5a63c62ddd9215461cf443b1c43ae5590891dff02c73", kill_on_drop: false }`
[INFO] [stderr] warning: type `Double_Node` should have an upper camel case name
[INFO] [stderr]  --> src/lib.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Double_Node {
[INFO] [stderr]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleNode`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `Double_LinkedList` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub struct Double_LinkedList {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedList`
[INFO] [stderr] 
[INFO] [stderr] warning: type `Double_LinkedList_Iterator` should have an upper camel case name
[INFO] [stderr]   --> src/lib.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 | pub struct Double_LinkedList_Iterator {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedListIterator`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result` is never read
[INFO] [stderr]   --> src/lib.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut result = None;
[INFO] [stderr]    |                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: `double_linkedlist` (lib) generated 4 warnings
[INFO] [stderr] warning: unused variable: `test_double_node`
[INFO] [stderr]    --> src/lib.rs:120:17
[INFO] [stderr]     |
[INFO] [stderr] 120 |         let mut test_double_node = Double_Node::new(10);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_test_double_node`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:120:13
[INFO] [stderr]     |
[INFO] [stderr] 120 |         let mut test_double_node = Double_Node::new(10);
[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: `double_linkedlist` (lib test) generated 6 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/double_linkedlist-3dad10cdb5524984)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_double_linkedlist_iterator ... ok
[INFO] [stdout] test tests::test_double_linkedlist_pop ... ok
[INFO] [stdout] test tests::test_double_node_new ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests double_linkedlist
[INFO] [stderr] warning: type `Double_Node` should have an upper camel case name
[INFO] [stderr]  --> /opt/rustwide/workdir/src/lib.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Double_Node {
[INFO] [stderr]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleNode`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `Double_LinkedList` should have an upper camel case name
[INFO] [stderr]   --> /opt/rustwide/workdir/src/lib.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub struct Double_LinkedList {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedList`
[INFO] [stderr] 
[INFO] [stderr] warning: type `Double_LinkedList_Iterator` should have an upper camel case name
[INFO] [stderr]   --> /opt/rustwide/workdir/src/lib.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 | pub struct Double_LinkedList_Iterator {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DoubleLinkedListIterator`
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b6e60c05af162ccb195f5a63c62ddd9215461cf443b1c43ae5590891dff02c73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6e60c05af162ccb195f5a63c62ddd9215461cf443b1c43ae5590891dff02c73", kill_on_drop: false }`
[INFO] [stdout] b6e60c05af162ccb195f5a63c62ddd9215461cf443b1c43ae5590891dff02c73