[INFO] updating cached repository https://github.com/alphalpha/librarian
[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] 3168cc79609275cf6b0ac99d306ab900133a04c5
[INFO] checking alphalpha/librarian against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falphalpha%2Flibrarian" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alphalpha/librarian 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/alphalpha/librarian
[INFO] finished tweaking git repo https://github.com/alphalpha/librarian
[INFO] tweaked toml for git repo https://github.com/alphalpha/librarian written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/alphalpha/librarian 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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] a6723c4f7fe1200a89a70abd5909ef0f2e68aad614945a687b30f47c3ec7da97
[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" "a6723c4f7fe1200a89a70abd5909ef0f2e68aad614945a687b30f47c3ec7da97"`
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling derive_builder v0.7.2
[INFO] [stderr]     Checking regex-syntax v0.6.11
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking humantime v1.2.0
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking flate2 v1.0.9
[INFO] [stderr]     Checking regex v1.2.1
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]    Compiling darling_core v0.9.0
[INFO] [stderr]    Compiling darling_macro v0.9.0
[INFO] [stderr]    Compiling darling v0.9.0
[INFO] [stderr]    Compiling derive_builder_core v0.5.0
[INFO] [stderr]     Checking id3 v0.3.0
[INFO] [stderr]     Checking librarian v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `str`
[INFO] [stderr]  --> src/error.rs:2:20
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{fmt, io, str};
[INFO] [stderr]   |                    ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `str`
[INFO] [stderr]  --> src/error.rs:2:20
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{fmt, io, str};
[INFO] [stderr]   |                    ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tag`
[INFO] [stderr]  --> src/lib.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let tag = Tag::read_from_path(source).map_err(Error::from)?;
[INFO] [stderr]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `target`
[INFO] [stderr]  --> src/lib.rs:8:45
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn tags_to_file_system(source: PathBuf, target: PathBuf) -> Result<(), Error> {
[INFO] [stderr]   |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_target`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tag`
[INFO] [stderr]  --> src/lib.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let tag = Tag::read_from_path(source).map_err(Error::from)?;
[INFO] [stderr]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `target`
[INFO] [stderr]  --> src/lib.rs:8:45
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn tags_to_file_system(source: PathBuf, target: PathBuf) -> Result<(), Error> {
[INFO] [stderr]   |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_target`
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.81s
[INFO] running `"docker" "inspect" "a6723c4f7fe1200a89a70abd5909ef0f2e68aad614945a687b30f47c3ec7da97"`
[INFO] running `"docker" "rm" "-f" "a6723c4f7fe1200a89a70abd5909ef0f2e68aad614945a687b30f47c3ec7da97"`
[INFO] [stdout] a6723c4f7fe1200a89a70abd5909ef0f2e68aad614945a687b30f47c3ec7da97