[INFO] fetching crate shardio 0.7.4...
[INFO] checking shardio-0.7.4 against master#4fa76a4a7742bb9c1febe33019f5a9e7e4839a65 for pr-83744
[INFO] extracting crate shardio 0.7.4 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate shardio 0.7.4 on toolchain 4fa76a4a7742bb9c1febe33019f5a9e7e4839a65
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shardio 0.7.4
[INFO] finished tweaking crates.io crate shardio 0.7.4
[INFO] tweaked toml for crates.io crate shardio 0.7.4 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "fetch" "--locked" "--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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] 72684d6d785ba8bf7ed6980b47b39c2e4c1fb3f5ed6718ee5ae93ebafe1e95b5
[INFO] running `Command { std: "docker" "start" "-a" "72684d6d785ba8bf7ed6980b47b39c2e4c1fb3f5ed6718ee5ae93ebafe1e95b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72684d6d785ba8bf7ed6980b47b39c2e4c1fb3f5ed6718ee5ae93ebafe1e95b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72684d6d785ba8bf7ed6980b47b39c2e4c1fb3f5ed6718ee5ae93ebafe1e95b5", kill_on_drop: false }`
[INFO] [stdout] 72684d6d785ba8bf7ed6980b47b39c2e4c1fb3f5ed6718ee5ae93ebafe1e95b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1edd0a1502ea95614b1facac719df8ae7e6255180bf983065e1446b24dfa80bd
[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" "1edd0a1502ea95614b1facac719df8ae7e6255180bf983065e1446b24dfa80bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking gimli v0.23.0
[INFO] [stderr]     Checking rustc-demangle v0.1.18
[INFO] [stderr]     Checking object v0.23.0
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking min-max-heap v1.3.0
[INFO] [stderr]     Checking is_sorted v0.1.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking getrandom v0.2.2
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking regex v1.4.5
[INFO] [stderr]     Checking pretty_assertions v0.6.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]    Compiling lz4-sys v1.9.2
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stderr]     Checking addr2line v0.14.1
[INFO] [stderr]     Checking backtrace v0.3.56
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking bstr v0.2.15
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stderr]     Checking serde_cbor v0.11.1
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.4
[INFO] [stderr]     Checking lz4 v1.23.2
[INFO] [stderr]     Checking shardio v0.7.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `benchmark_roundtrip`
[INFO] [stdout]    --> benches/my_bench.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn benchmark_roundtrip(c: &mut Criterion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `getf`
[INFO] [stdout]    --> benches/my_bench.rs:128:8
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn getf() -> impl Write {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `direct`
[INFO] [stdout]    --> benches/my_bench.rs:132:8
[INFO] [stdout]     |
[INFO] [stdout] 132 |     fn direct(size: usize) -> Result<(), Error> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `lz4_only`
[INFO] [stdout]    --> benches/my_bench.rs:138:8
[INFO] [stdout]     |
[INFO] [stdout] 138 |     fn lz4_only(size: usize) -> Result<(), Error> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bincode_only`
[INFO] [stdout]    --> benches/my_bench.rs:146:8
[INFO] [stdout]     |
[INFO] [stdout] 146 |     fn bincode_only(size: usize) -> Result<(), Error> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bincode_lz4`
[INFO] [stdout]    --> benches/my_bench.rs:153:8
[INFO] [stdout]     |
[INFO] [stdout] 153 |     fn bincode_lz4(size: usize) -> Result<(), Error> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bincode_buf_lz4`
[INFO] [stdout]    --> benches/my_bench.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 |     fn bincode_buf_lz4(size: usize) -> Result<(), Error> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `KB`
[INFO] [stdout]    --> benches/my_bench.rs:172:5
[INFO] [stdout]     |
[INFO] [stdout] 172 |     const KB: usize = 1024;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `v`
[INFO] [stdout]    --> benches/my_bench.rs:173:5
[INFO] [stdout]     |
[INFO] [stdout] 173 |     static v: [usize; 4] = [256 * KB, 512 * KB, 1024 * KB, 2048 * KB];
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> benches/my_bench.rs:95:21
[INFO] [stdout]    |
[INFO] [stdout] 95 |                     sender.send(tt);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> benches/my_bench.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |         check_round_trip(2048, 32, 1 << 13, 1 << 17);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `v` should have an upper case name
[INFO] [stdout]    --> benches/my_bench.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |     static v: [usize; 4] = [256 * KB, 512 * KB, 1024 * KB, 2048 * KB];
[INFO] [stdout]     |            ^ help: convert the identifier to upper case (notice the capitalization): `V`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.37s
[INFO] running `Command { std: "docker" "inspect" "1edd0a1502ea95614b1facac719df8ae7e6255180bf983065e1446b24dfa80bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1edd0a1502ea95614b1facac719df8ae7e6255180bf983065e1446b24dfa80bd", kill_on_drop: false }`
[INFO] [stdout] 1edd0a1502ea95614b1facac719df8ae7e6255180bf983065e1446b24dfa80bd