[INFO] fetching crate double_linkedlist 0.1.2...
[INFO] checking double_linkedlist-0.1.2 against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] extracting crate double_linkedlist 0.1.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate double_linkedlist 0.1.2 on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", 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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f292836d97d7f38ad5a919cd05fb09554309394fc1fe8b88978ee7b022889a18
[INFO] running `Command { std: "docker" "start" "-a" "f292836d97d7f38ad5a919cd05fb09554309394fc1fe8b88978ee7b022889a18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f292836d97d7f38ad5a919cd05fb09554309394fc1fe8b88978ee7b022889a18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f292836d97d7f38ad5a919cd05fb09554309394fc1fe8b88978ee7b022889a18", kill_on_drop: false }`
[INFO] [stdout] f292836d97d7f38ad5a919cd05fb09554309394fc1fe8b88978ee7b022889a18
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b916eb60440ff82cbbff1c23f36e83ac4df46d1aefe127d39e17de07a81650f4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b916eb60440ff82cbbff1c23f36e83ac4df46d1aefe127d39e17de07a81650f4", kill_on_drop: false }`
[INFO] [stderr]     Checking 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: 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:55:13
[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: value assigned to `result` is never read
[INFO] [stdout]   --> src/lib.rs:55:13
[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:120:13
[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] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "b916eb60440ff82cbbff1c23f36e83ac4df46d1aefe127d39e17de07a81650f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b916eb60440ff82cbbff1c23f36e83ac4df46d1aefe127d39e17de07a81650f4", kill_on_drop: false }`
[INFO] [stdout] b916eb60440ff82cbbff1c23f36e83ac4df46d1aefe127d39e17de07a81650f4