[INFO] cloning repository https://github.com/lopeetall/fields-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lopeetall/fields-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flopeetall%2Ffields-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flopeetall%2Ffields-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2bc4676d2aa902a1c31a3c2c72eae127a3cb6edf
[INFO] building lopeetall/fields-rust against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flopeetall%2Ffields-rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lopeetall/fields-rust on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lopeetall/fields-rust
[INFO] finished tweaking git repo https://github.com/lopeetall/fields-rust
[INFO] tweaked toml for git repo https://github.com/lopeetall/fields-rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/lopeetall/fields-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "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-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c4a8b68559460d7ad6e906f8432ea51dd0cd4cae4f726da9f8b5df6f0be2c83
[INFO] running `Command { std: "docker" "start" "-a" "4c4a8b68559460d7ad6e906f8432ea51dd0cd4cae4f726da9f8b5df6f0be2c83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c4a8b68559460d7ad6e906f8432ea51dd0cd4cae4f726da9f8b5df6f0be2c83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c4a8b68559460d7ad6e906f8432ea51dd0cd4cae4f726da9f8b5df6f0be2c83", kill_on_drop: false }`
[INFO] [stdout] 4c4a8b68559460d7ad6e906f8432ea51dd0cd4cae4f726da9f8b5df6f0be2c83
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cba9c7315b480b0aefe88c19ce3c86524f94ecacc4c49d2ca05839c6570157c6
[INFO] running `Command { std: "docker" "start" "-a" "cba9c7315b480b0aefe88c19ce3c86524f94ecacc4c49d2ca05839c6570157c6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.64
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling fields-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `rand` is never used
[INFO] [stdout]   --> src/fields.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl U256 {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn rand () -> U256 {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `rand` is never used
[INFO] [stdout]    --> src/fields.rs:363:12
[INFO] [stdout]     |
[INFO] [stdout] 356 | impl PrimeField {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 363 |     pub fn rand (self) -> PrimeFieldElement {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.83s
[INFO] running `Command { std: "docker" "inspect" "cba9c7315b480b0aefe88c19ce3c86524f94ecacc4c49d2ca05839c6570157c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cba9c7315b480b0aefe88c19ce3c86524f94ecacc4c49d2ca05839c6570157c6", kill_on_drop: false }`
[INFO] [stdout] cba9c7315b480b0aefe88c19ce3c86524f94ecacc4c49d2ca05839c6570157c6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 75ad0e79c2add1ee22a209db9810f9de184554aa01308cc807b7bd55efe5a111
[INFO] running `Command { std: "docker" "start" "-a" "75ad0e79c2add1ee22a209db9810f9de184554aa01308cc807b7bd55efe5a111", kill_on_drop: false }`
[INFO] [stderr]    Compiling fields-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `rand` is never used
[INFO] [stdout]   --> src/fields.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl U256 {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn rand () -> U256 {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `rand` is never used
[INFO] [stdout]    --> src/fields.rs:363:12
[INFO] [stdout]     |
[INFO] [stdout] 356 | impl PrimeField {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 363 |     pub fn rand (self) -> PrimeFieldElement {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "75ad0e79c2add1ee22a209db9810f9de184554aa01308cc807b7bd55efe5a111", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75ad0e79c2add1ee22a209db9810f9de184554aa01308cc807b7bd55efe5a111", kill_on_drop: false }`
[INFO] [stdout] 75ad0e79c2add1ee22a209db9810f9de184554aa01308cc807b7bd55efe5a111