[INFO] fetching crate idx-rs 0.10.0...
[INFO] checking idx-rs-0.10.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate idx-rs 0.10.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate idx-rs 0.10.0
[INFO] finished tweaking crates.io crate idx-rs 0.10.0
[INFO] tweaked toml for crates.io crate idx-rs 0.10.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate idx-rs 0.10.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 98 packages to latest compatible versions
[INFO] [stderr]       Adding bzip2 v0.4.4 (available: v0.6.0)
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.6.0)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded databuffer v1.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b576d16defca92504e29dacfa0bb6e2fe8671778fa3a1b6be913bb1db6f5fc85
[INFO] running `Command { std: "docker" "start" "-a" "b576d16defca92504e29dacfa0bb6e2fe8671778fa3a1b6be913bb1db6f5fc85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b576d16defca92504e29dacfa0bb6e2fe8671778fa3a1b6be913bb1db6f5fc85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b576d16defca92504e29dacfa0bb6e2fe8671778fa3a1b6be913bb1db6f5fc85", kill_on_drop: false }`
[INFO] [stdout] b576d16defca92504e29dacfa0bb6e2fe8671778fa3a1b6be913bb1db6f5fc85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d322a8f63b1fb92f813809578aaf63c9a8e4465ec77f1e185e245be8ebb60ab
[INFO] running `Command { std: "docker" "start" "-a" "7d322a8f63b1fb92f813809578aaf63c9a8e4465ec77f1e185e245be8ebb60ab", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]    Compiling pkg-config v0.3.32
[INFO] [stderr]     Checking either v1.15.0
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]    Compiling cc v1.2.27
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking plotters-backend v0.3.7
[INFO] [stderr]     Checking unicode-width v0.1.14
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking walkdir v2.5.0
[INFO] [stderr]     Checking databuffer v1.1.4
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking crc32fast v1.4.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking oorandom v11.1.5
[INFO] [stderr]     Checking plotters-svg v0.3.7
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking csv-core v0.1.12
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.6
[INFO] [stderr]    Compiling bzip2-sys v0.1.13+1.0.8
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking rayon-core v1.12.1
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking bzip2 v0.4.4
[INFO] [stderr]     Checking idx-rs v0.10.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:180:18
[INFO] [stdout]     |
[INFO] [stdout] 180 |     pub fn index(&mut self, idx: usize) -> IdxFileOpt {
[INFO] [stdout]     |                  ^^^^^^^^^                 ---------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 180 |     pub fn index(&mut self, idx: usize) -> IdxFileOpt<'_> {
[INFO] [stdout]     |                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.140
[INFO] [stderr]     Checking csv v1.3.1
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> tests/lib.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let _ = CACHE.lock();
[INFO] [stdout]    |         ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let _unused = CACHE.lock();
[INFO] [stdout]    |          ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 14 -     let _ = CACHE.lock();
[INFO] [stdout] 14 +     drop(CACHE.lock());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `idx-rs` (test "lib") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:180:18
[INFO] [stdout]     |
[INFO] [stdout] 180 |     pub fn index(&mut self, idx: usize) -> IdxFileOpt {
[INFO] [stdout]     |                  ^^^^^^^^^                 ---------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 180 |     pub fn index(&mut self, idx: usize) -> IdxFileOpt<'_> {
[INFO] [stdout]     |                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7d322a8f63b1fb92f813809578aaf63c9a8e4465ec77f1e185e245be8ebb60ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d322a8f63b1fb92f813809578aaf63c9a8e4465ec77f1e185e245be8ebb60ab", kill_on_drop: false }`
[INFO] [stdout] 7d322a8f63b1fb92f813809578aaf63c9a8e4465ec77f1e185e245be8ebb60ab