[INFO] fetching crate percy-dom 0.7.1...
[INFO] checking percy-dom-0.7.1 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate percy-dom 0.7.1 into /workspace/builds/worker-97/source
[INFO] validating manifest of crates.io crate percy-dom 0.7.1 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate percy-dom 0.7.1
[INFO] finished tweaking crates.io crate percy-dom 0.7.1
[INFO] tweaked toml for crates.io crate percy-dom 0.7.1 written to /workspace/builds/worker-97/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e13117760e980e60c7ec258b62a43d28917c9cf8fddbc2496315125439cd5ede
[INFO] running `Command { std: "docker" "start" "-a" "e13117760e980e60c7ec258b62a43d28917c9cf8fddbc2496315125439cd5ede", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e13117760e980e60c7ec258b62a43d28917c9cf8fddbc2496315125439cd5ede", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e13117760e980e60c7ec258b62a43d28917c9cf8fddbc2496315125439cd5ede", kill_on_drop: false }`
[INFO] [stdout] e13117760e980e60c7ec258b62a43d28917c9cf8fddbc2496315125439cd5ede
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6962d867bf7565607955fca340d03630659dae8b42baadb9bd5388ae62caae78
[INFO] running `Command { std: "docker" "start" "-a" "6962d867bf7565607955fca340d03630659dae8b42baadb9bd5388ae62caae78", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.78
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling bumpalo v3.8.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.78
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]    Compiling html-validation v0.1.2
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.3.28
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.78
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.78
[INFO] [stderr]    Compiling html-macro v0.2.1
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.78
[INFO] [stderr]     Checking js-sys v0.3.55
[INFO] [stderr]     Checking console_error_panic_hook v0.1.7
[INFO] [stderr]     Checking web-sys v0.3.55
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.28
[INFO] [stderr]     Checking wasm-bindgen-test v0.3.28
[INFO] [stderr]     Checking virtual-node v0.3.1
[INFO] [stderr]     Checking percy-dom v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `get_element_by_id`
[INFO] [stdout]   --> tests/on_remove_element.rs:14:46
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::testing_utilities::{create_mount, get_element_by_id, random_id};
[INFO] [stdout]    |                                              ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `append_to_document`
[INFO] [stdout]   --> tests/testing_utilities.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn append_to_document (elem: &web_sys::Element) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_element_by_id`
[INFO] [stdout]   --> tests/testing_utilities.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn get_element_by_id(id: &str) -> web_sys::Element {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `document`
[INFO] [stdout]  --> tests/testing_utilities.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn document() -> web_sys::Document {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `append_to_document`
[INFO] [stdout]   --> tests/testing_utilities.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn append_to_document (elem: &web_sys::Element) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_element_by_id`
[INFO] [stdout]   --> tests/testing_utilities.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn get_element_by_id(id: &str) -> web_sys::Element {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_mount`
[INFO] [stdout]   --> tests/testing_utilities.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn create_mount() -> web_sys::Element {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `append_to_document`
[INFO] [stdout]   --> tests/testing_utilities.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn append_to_document (elem: &web_sys::Element) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.25s
[INFO] running `Command { std: "docker" "inspect" "6962d867bf7565607955fca340d03630659dae8b42baadb9bd5388ae62caae78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6962d867bf7565607955fca340d03630659dae8b42baadb9bd5388ae62caae78", kill_on_drop: false }`
[INFO] [stdout] 6962d867bf7565607955fca340d03630659dae8b42baadb9bd5388ae62caae78