[INFO] fetching crate serde_wxf 0.0.1...
[INFO] checking serde_wxf-0.0.1 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate serde_wxf 0.0.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate serde_wxf 0.0.1
[INFO] finished tweaking crates.io crate serde_wxf 0.0.1
[INFO] tweaked toml for crates.io crate serde_wxf 0.0.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde_wxf 0.0.1 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 23 packages to latest compatible versions
[INFO] [stderr]       Adding wolfram_wxf v0.5.0 (available: v0.7.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e0f69897b8f50cf1f146ef867bb9ef0b8925219f506c49c1110492457daad315
[INFO] running `Command { std: "docker" "start" "-a" "e0f69897b8f50cf1f146ef867bb9ef0b8925219f506c49c1110492457daad315", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e0f69897b8f50cf1f146ef867bb9ef0b8925219f506c49c1110492457daad315", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0f69897b8f50cf1f146ef867bb9ef0b8925219f506c49c1110492457daad315", kill_on_drop: false }`
[INFO] [stdout] e0f69897b8f50cf1f146ef867bb9ef0b8925219f506c49c1110492457daad315
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cab5b79f7b6638ff2f5bae02fe18c0924651f654467ac55d303d99b0ed8d2f08
[INFO] running `Command { std: "docker" "start" "-a" "cab5b79f7b6638ff2f5bae02fe18c0924651f654467ac55d303d99b0ed8d2f08", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]    Compiling ndarray v0.13.1
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking serde v1.0.219
[INFO] [stderr]     Checking matrixmultiply v0.2.4
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking num-iter v0.1.45
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking wolfram_wxf v0.5.0
[INFO] [stderr]     Checking serde_wxf v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn end(mut self) -> Result<()> {
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn end(mut self) -> Result<()> {
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ser/sequence.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn end(mut self) -> Result<()> {
[INFO] [stdout]    |            ----^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.66s
[INFO] running `Command { std: "docker" "inspect" "cab5b79f7b6638ff2f5bae02fe18c0924651f654467ac55d303d99b0ed8d2f08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cab5b79f7b6638ff2f5bae02fe18c0924651f654467ac55d303d99b0ed8d2f08", kill_on_drop: false }`
[INFO] [stdout] cab5b79f7b6638ff2f5bae02fe18c0924651f654467ac55d303d99b0ed8d2f08