[INFO] updating cached repository https://github.com/alphalpha/librarian
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/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] testing alphalpha/librarian against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Falphalpha%2Flibrarian" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alphalpha/librarian on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "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 work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/alphalpha/librarian already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 75fe8028841ce4575c068e186cc66df5d12011b70ba708873f8c1d8a006cad3d
[INFO] running `"docker" "start" "-a" "75fe8028841ce4575c068e186cc66df5d12011b70ba708873f8c1d8a006cad3d"`
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling flate2 v1.0.9
[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]    Compiling derive_builder v0.7.2
[INFO] [stderr]    Compiling id3 v0.3.0
[INFO] [stderr]    Compiling 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 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: consider prefixing 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: consider prefixing with an underscore: `_target`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.41s
[INFO] running `"docker" "inspect" "75fe8028841ce4575c068e186cc66df5d12011b70ba708873f8c1d8a006cad3d"`
[INFO] running `"docker" "rm" "-f" "75fe8028841ce4575c068e186cc66df5d12011b70ba708873f8c1d8a006cad3d"`
[INFO] [stdout] 75fe8028841ce4575c068e186cc66df5d12011b70ba708873f8c1d8a006cad3d
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] acceae2f1d9c9e9baed9da15fd55913ea2355a954ebed7e26e166409febd386c
[INFO] running `"docker" "start" "-a" "acceae2f1d9c9e9baed9da15fd55913ea2355a954ebed7e26e166409febd386c"`
[INFO] [stderr]    Compiling 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 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: consider prefixing 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: consider prefixing with an underscore: `_target`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.19s
[INFO] running `"docker" "inspect" "acceae2f1d9c9e9baed9da15fd55913ea2355a954ebed7e26e166409febd386c"`
[INFO] running `"docker" "rm" "-f" "acceae2f1d9c9e9baed9da15fd55913ea2355a954ebed7e26e166409febd386c"`
[INFO] [stdout] acceae2f1d9c9e9baed9da15fd55913ea2355a954ebed7e26e166409febd386c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] ebdeef2709b8e3fca4cd67b4fdf04b23d863323eb177354afb2fc696650f2fc4
[INFO] running `"docker" "start" "-a" "ebdeef2709b8e3fca4cd67b4fdf04b23d863323eb177354afb2fc696650f2fc4"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.25s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/librarian-0dd150b8b134e334
[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] [stderr]      Running /opt/rustwide/target/debug/deps/librarian-edfea2e156073963
[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] [stderr]    Doc-tests librarian
[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" "ebdeef2709b8e3fca4cd67b4fdf04b23d863323eb177354afb2fc696650f2fc4"`
[INFO] running `"docker" "rm" "-f" "ebdeef2709b8e3fca4cd67b4fdf04b23d863323eb177354afb2fc696650f2fc4"`
[INFO] [stdout] ebdeef2709b8e3fca4cd67b4fdf04b23d863323eb177354afb2fc696650f2fc4