[INFO] fetching crate serde_ub_json 0.1.0...
[INFO] checking serde_ub_json-0.1.0 against master#bbe853615821442ef11d6cd42a30a73432b38d89 for pr-154205
[INFO] extracting crate serde_ub_json 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate serde_ub_json 0.1.0
[INFO] finished tweaking crates.io crate serde_ub_json 0.1.0
[INFO] tweaked toml for crates.io crate serde_ub_json 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde_ub_json 0.1.0 on toolchain bbe853615821442ef11d6cd42a30a73432b38d89
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "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" "+bbe853615821442ef11d6cd42a30a73432b38d89" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 63 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.8.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e632b0d0a66683f6aae4f0245f20b5ef6e2ca50908897c0654ac1bef78669d2c
[INFO] running `Command { std: "docker" "start" "-a" "e632b0d0a66683f6aae4f0245f20b5ef6e2ca50908897c0654ac1bef78669d2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e632b0d0a66683f6aae4f0245f20b5ef6e2ca50908897c0654ac1bef78669d2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e632b0d0a66683f6aae4f0245f20b5ef6e2ca50908897c0654ac1bef78669d2c", kill_on_drop: false }`
[INFO] [stdout] e632b0d0a66683f6aae4f0245f20b5ef6e2ca50908897c0654ac1bef78669d2c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 38b158ccf7545d81d33562883d3c44ff341e924aa359200464b457c9d237ee61
[INFO] running `Command { std: "docker" "start" "-a" "38b158ccf7545d81d33562883d3c44ff341e924aa359200464b457c9d237ee61", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking regex-syntax v0.8.10
[INFO] [stderr]     Checking csv-core v0.1.13
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]     Checking csv v1.4.0
[INFO] [stderr]     Checking regex v1.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking serde_ub_json v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] warning: unused import: `serde::Serialize`
[INFO] [stdout]  --> benches/benchmarks/ser_vec_of_integers.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::Serialize;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::Deserialize`
[INFO] [stdout]  --> benches/benchmarks/de_vec_of_integers.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::Deserialize;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `field1` and `field2` are never read
[INFO] [stdout]  --> benches/benchmarks/de_simple_struct.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct SimpleStruct {
[INFO] [stdout]   |        ------------ fields in this struct
[INFO] [stdout] 6 |     field1: i32,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 7 |     field2: String,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `SimpleStruct` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]    --> src/ser.rs:713:33
[INFO] [stdout]     |
[INFO] [stdout] 713 |             vec![b'i', unsafe { transmute::<i8, u8>(value.to_be()) }]
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout] help: replace this with
[INFO] [stdout]     |
[INFO] [stdout] 713 -             vec![b'i', unsafe { transmute::<i8, u8>(value.to_be()) }]
[INFO] [stdout] 713 +             vec![b'i', unsafe { i8::cast_unsigned(value.to_be()) }]
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.68s
[INFO] running `Command { std: "docker" "inspect" "38b158ccf7545d81d33562883d3c44ff341e924aa359200464b457c9d237ee61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38b158ccf7545d81d33562883d3c44ff341e924aa359200464b457c9d237ee61", kill_on_drop: false }`
[INFO] [stdout] 38b158ccf7545d81d33562883d3c44ff341e924aa359200464b457c9d237ee61