[INFO] updating cached repository https://github.com/b-m-f/rust_playground
[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] fd5f5c1e312db99abdf4b07d809f0735db153586
[INFO] testing b-m-f/rust_playground against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fb-m-f%2Frust_playground" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/b-m-f/rust_playground on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/b-m-f/rust_playground
[INFO] finished tweaking git repo https://github.com/b-m-f/rust_playground
[INFO] tweaked toml for git repo https://github.com/b-m-f/rust_playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/b-m-f/rust_playground already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 39a893cf2e2650a9c1e7209b265bd4a920ec75365082eb1c01ea805758565769
[INFO] running `"docker" "start" "-a" "39a893cf2e2650a9c1e7209b265bd4a920ec75365082eb1c01ea805758565769"`
[INFO] [stderr]    Compiling term v0.4.4
[INFO] [stderr]    Compiling fs_examples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `factorial_recursive`
[INFO] [stderr]  --> src/math.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial`
[INFO] [stderr]  --> src/math.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.49s
[INFO] running `"docker" "inspect" "39a893cf2e2650a9c1e7209b265bd4a920ec75365082eb1c01ea805758565769"`
[INFO] running `"docker" "rm" "-f" "39a893cf2e2650a9c1e7209b265bd4a920ec75365082eb1c01ea805758565769"`
[INFO] [stdout] 39a893cf2e2650a9c1e7209b265bd4a920ec75365082eb1c01ea805758565769
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 594b7e185b92a6bb9b7624c78b43a9c26b1d40888aa8aa6ca74ad2a19a972458
[INFO] running `"docker" "start" "-a" "594b7e185b92a6bb9b7624c78b43a9c26b1d40888aa8aa6ca74ad2a19a972458"`
[INFO] [stderr]    Compiling fs_examples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `factorial_recursive`
[INFO] [stderr]  --> src/math.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial`
[INFO] [stderr]  --> src/math.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "594b7e185b92a6bb9b7624c78b43a9c26b1d40888aa8aa6ca74ad2a19a972458"`
[INFO] running `"docker" "rm" "-f" "594b7e185b92a6bb9b7624c78b43a9c26b1d40888aa8aa6ca74ad2a19a972458"`
[INFO] [stdout] 594b7e185b92a6bb9b7624c78b43a9c26b1d40888aa8aa6ca74ad2a19a972458
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9e9a2798d7de4d2d4a607d07c66f259c394c9f732bf2355c67b4a4fa8b32f5c3
[INFO] running `"docker" "start" "-a" "9e9a2798d7de4d2d4a607d07c66f259c394c9f732bf2355c67b4a4fa8b32f5c3"`
[INFO] [stderr] warning: function is never used: `factorial_recursive`
[INFO] [stderr]  --> src/math.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial`
[INFO] [stderr]  --> src/math.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/fs_examples-fb20cdd94f737f9c
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "9e9a2798d7de4d2d4a607d07c66f259c394c9f732bf2355c67b4a4fa8b32f5c3"`
[INFO] running `"docker" "rm" "-f" "9e9a2798d7de4d2d4a607d07c66f259c394c9f732bf2355c67b4a4fa8b32f5c3"`
[INFO] [stdout] 9e9a2798d7de4d2d4a607d07c66f259c394c9f732bf2355c67b4a4fa8b32f5c3