[INFO] updating cached repository https://github.com/cswinter/pyo3-backtrace-repro
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 25bb4dcdb4b173e5524b86098196636aef06ab4b
[INFO] checking cswinter/pyo3-backtrace-repro against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcswinter%2Fpyo3-backtrace-repro" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cswinter/pyo3-backtrace-repro on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/cswinter/pyo3-backtrace-repro
[INFO] finished tweaking git repo https://github.com/cswinter/pyo3-backtrace-repro
[INFO] tweaked toml for git repo https://github.com/cswinter/pyo3-backtrace-repro written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/cswinter/pyo3-backtrace-repro already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0c748b1f3b05ef009f25671b25cf7aa76e42a5a65f5014baee7a7f1caa848946
[INFO] running `"docker" "start" "-a" "0c748b1f3b05ef009f25671b25cf7aa76e42a5a65f5014baee7a7f1caa848946"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling memchr v2.3.2
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]     Checking smallvec v1.2.0
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling aho-corasick v0.7.8
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]    Compiling regex v1.3.4
[INFO] [stderr]    Compiling pyo3-derive-backend v0.9.0-alpha.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling ctor v0.1.12
[INFO] [stderr]    Compiling inventory-impl v0.1.5
[INFO] [stderr]    Compiling ghost v0.1.1
[INFO] [stderr]    Compiling pyo3cls v0.9.0-alpha.1
[INFO] [stderr]     Checking inventory v0.1.5
[INFO] [stderr]    Compiling indoc-impl v0.3.4
[INFO] [stderr]    Compiling paste-impl v0.1.6
[INFO] [stderr]     Checking paste v0.1.6
[INFO] [stderr]     Checking indoc v0.3.4
[INFO] [stderr]    Compiling serde_json v1.0.48
[INFO] [stderr]    Compiling pyo3 v0.9.0-alpha.1
[INFO] [stderr]     Checking pyo3-backtrace-repro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `py`
[INFO] [stderr]   --> src/lib.rs:27:25
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn pyo3_backtrace_repro(py: Python, m: &PyModule) -> PyResult<()> {
[INFO] [stderr]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_py`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `py`
[INFO] [stderr]   --> src/lib.rs:27:25
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn pyo3_backtrace_repro(py: Python, m: &PyModule) -> PyResult<()> {
[INFO] [stderr]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_py`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     oh_noes();
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     oh_noes();
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/bin/main.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 |    oh_noes();
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/bin/main.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 |    oh_noes();
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 15s
[INFO] running `"docker" "inspect" "0c748b1f3b05ef009f25671b25cf7aa76e42a5a65f5014baee7a7f1caa848946"`
[INFO] running `"docker" "rm" "-f" "0c748b1f3b05ef009f25671b25cf7aa76e42a5a65f5014baee7a7f1caa848946"`
[INFO] [stdout] 0c748b1f3b05ef009f25671b25cf7aa76e42a5a65f5014baee7a7f1caa848946