[INFO] updating cached repository https://github.com/bookinstock/rust_example
[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] c83d144f2d500cd60a59da5019b4bc5ca7d2d36f
[INFO] checking bookinstock/rust_example against try#5fae8f15a4dcfce640ee800a4d495673524b0a4d for pr-71814
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbookinstock%2Frust_example" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bookinstock/rust_example on toolchain 5fae8f15a4dcfce640ee800a4d495673524b0a4d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+5fae8f15a4dcfce640ee800a4d495673524b0a4d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bookinstock/rust_example
[INFO] finished tweaking git repo https://github.com/bookinstock/rust_example
[INFO] tweaked toml for git repo https://github.com/bookinstock/rust_example written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/bookinstock/rust_example already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+5fae8f15a4dcfce640ee800a4d495673524b0a4d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+5fae8f15a4dcfce640ee800a4d495673524b0a4d" "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] d01854b8e9737857912a3a072c002d876d3222219105aa2d59804381b64c36f2
[INFO] running `"docker" "start" "-a" "d01854b8e9737857912a3a072c002d876d3222219105aa2d59804381b64c36f2"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust_example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures`
[INFO] [stderr]   --> src/bin/async.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use futures::executor::block_on;
[INFO] [stderr]    |     ^^^^^^^ use of undeclared type or module `futures`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `block_on` in this scope
[INFO] [stderr]   --> src/bin/async.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     block_on(future); // `future` is run and "hello, world!" is printed
[INFO] [stderr]    |     ^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0433.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: could not compile `rust_example`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the item `From` is imported redundantly
[INFO] [stderr]   --> src/bin/conversion.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     use std::convert::From;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `ToString` is imported redundantly
[INFO] [stderr]    --> src/bin/conversion.rs:106:9
[INFO] [stderr]     |
[INFO] [stderr] 106 |     use std::string::ToString;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_string`
[INFO] [stderr]   --> src/bin/conversion.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let my_string = String::from(my_str);
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stderr]    |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]   --> src/bin/conversion.rs:45:8
[INFO] [stderr]    |
[INFO] [stderr] 45 | #[warn(unused_variables)]
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttt`
[INFO] [stderr]    --> src/bin/hello.rs:107:4
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn ttt() {
[INFO] [stderr]     |    ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]    --> src/bin/hello.rs:120:4
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn f() {
[INFO] [stderr]     |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test`
[INFO] [stderr]    --> src/bin/hello.rs:124:4
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn test() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `try_debug_trait`
[INFO] [stderr]    --> src/bin/hello.rs:159:4
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn try_debug_trait() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d01854b8e9737857912a3a072c002d876d3222219105aa2d59804381b64c36f2"`
[INFO] running `"docker" "rm" "-f" "d01854b8e9737857912a3a072c002d876d3222219105aa2d59804381b64c36f2"`
[INFO] [stdout] d01854b8e9737857912a3a072c002d876d3222219105aa2d59804381b64c36f2