[INFO] updating cached repository https://github.com/Patapum/delaystderr
[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] f92d72c0c18222096e8bd72b03d961b154499efc
[INFO] checking Patapum/delaystderr against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPatapum%2Fdelaystderr" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Patapum/delaystderr on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Patapum/delaystderr
[INFO] finished tweaking git repo https://github.com/Patapum/delaystderr
[INFO] tweaked toml for git repo https://github.com/Patapum/delaystderr written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/Patapum/delaystderr already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 95138eae4b28a7ad3be8c97db702aa6353472f31e5cc2189e1b5e059b473ba7d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "95138eae4b28a7ad3be8c97db702aa6353472f31e5cc2189e1b5e059b473ba7d"`
[INFO] [stderr]     Checking libc v0.2.40
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking futures v0.1.21
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking slab v0.4.0
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]     Checking log v0.4.1
[INFO] [stderr]     Checking crossbeam-utils v0.3.2
[INFO] [stderr]     Checking futures-core v0.2.1
[INFO] [stderr]     Checking crossbeam-epoch v0.4.1
[INFO] [stderr]     Checking futures-channel v0.2.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking net2 v0.2.32
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking crossbeam-deque v0.3.1
[INFO] [stderr]     Checking futures-sink v0.2.1
[INFO] [stderr]     Checking bytes v0.4.7
[INFO] [stderr]     Checking futures-io v0.2.1
[INFO] [stderr]     Checking futures-util v0.2.1
[INFO] [stderr]     Checking mio v0.6.14
[INFO] [stderr]     Checking tokio-executor v0.1.2
[INFO] [stderr]     Checking tokio-io v0.1.6
[INFO] [stderr]     Checking tokio-threadpool v0.1.3
[INFO] [stderr]     Checking tokio-timer v0.2.3
[INFO] [stderr]     Checking mio-uds v0.6.6
[INFO] [stderr]     Checking tokio-reactor v0.1.1
[INFO] [stderr]     Checking futures-executor v0.2.1
[INFO] [stderr]     Checking tokio-fs v0.1.0
[INFO] [stderr]     Checking tokio-tcp v0.1.0
[INFO] [stderr]     Checking tokio-udp v0.1.0
[INFO] [stderr]     Checking futures-stable v0.2.1
[INFO] [stderr]     Checking futures-async-runtime v0.2.1
[INFO] [stderr]     Checking tokio v0.1.6
[INFO] [stderr]     Checking futures v0.2.1
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking tokio-signal v0.1.5
[INFO] [stderr]     Checking tokio-process v0.1.6
[INFO] [stderr]     Checking delaystderr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `chars` found for mutable reference `&mut std::process::ChildStderr` in the current scope
[INFO] [stderr]   --> src/main.rs:26:46
[INFO] [stderr]    |
[INFO] [stderr] 26 |     for char in cmd.stderr.as_mut().unwrap().chars() {
[INFO] [stderr]    |                                              ^^^^^ method not found in `&mut std::process::ChildStderr`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error[E0599]: no method named `chars` found for mutable reference `&mut std::process::ChildStderr` in the current scope
[INFO] [stderr]   --> src/main.rs:26:46
[INFO] [stderr]    |
[INFO] [stderr] 26 |     for char in cmd.stderr.as_mut().unwrap().chars() {
[INFO] [stderr]    |                                              ^^^^^ method not found in `&mut std::process::ChildStderr`
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `delaystderr`.
[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] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `delaystderr`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "95138eae4b28a7ad3be8c97db702aa6353472f31e5cc2189e1b5e059b473ba7d"`
[INFO] running `"docker" "rm" "-f" "95138eae4b28a7ad3be8c97db702aa6353472f31e5cc2189e1b5e059b473ba7d"`
[INFO] [stdout] 95138eae4b28a7ad3be8c97db702aa6353472f31e5cc2189e1b5e059b473ba7d