[INFO] fetching crate buff 0.1.0...
[INFO] testing buff-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate buff 0.1.0 into /workspace/builds/worker-36/source
[INFO] validating manifest of crates.io crate buff 0.1.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buff 0.1.0
[INFO] finished tweaking crates.io crate buff 0.1.0
[INFO] tweaked toml for crates.io crate buff 0.1.0 written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 190637ad50669edf905196a1238a163e50e42f00da70752da32c92d9102debb5
[INFO] running `Command { std: "docker" "start" "-a" "190637ad50669edf905196a1238a163e50e42f00da70752da32c92d9102debb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "190637ad50669edf905196a1238a163e50e42f00da70752da32c92d9102debb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "190637ad50669edf905196a1238a163e50e42f00da70752da32c92d9102debb5", kill_on_drop: false }`
[INFO] [stdout] 190637ad50669edf905196a1238a163e50e42f00da70752da32c92d9102debb5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74c8e09b5bdd9fb3681edb1c53f8a3573694b69a41e4f4472e94824b8cc19524
[INFO] running `Command { std: "docker" "start" "-a" "74c8e09b5bdd9fb3681edb1c53f8a3573694b69a41e4f4472e94824b8cc19524", kill_on_drop: false }`
[INFO] [stderr]    Compiling buff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "74c8e09b5bdd9fb3681edb1c53f8a3573694b69a41e4f4472e94824b8cc19524", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74c8e09b5bdd9fb3681edb1c53f8a3573694b69a41e4f4472e94824b8cc19524", kill_on_drop: false }`
[INFO] [stdout] 74c8e09b5bdd9fb3681edb1c53f8a3573694b69a41e4f4472e94824b8cc19524
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a010ebdf75e568f26dfd3a1ece2c24d3d78344292905eaca39667d9ce962caa2
[INFO] running `Command { std: "docker" "start" "-a" "a010ebdf75e568f26dfd3a1ece2c24d3d78344292905eaca39667d9ce962caa2", kill_on_drop: false }`
[INFO] [stderr]    Compiling buff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `Command { std: "docker" "inspect" "a010ebdf75e568f26dfd3a1ece2c24d3d78344292905eaca39667d9ce962caa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a010ebdf75e568f26dfd3a1ece2c24d3d78344292905eaca39667d9ce962caa2", kill_on_drop: false }`
[INFO] [stdout] a010ebdf75e568f26dfd3a1ece2c24d3d78344292905eaca39667d9ce962caa2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 499037a985d92be411f304b36d502f0c88bf42133e6a407c977dcb2c931824e2
[INFO] running `Command { std: "docker" "start" "-a" "499037a985d92be411f304b36d502f0c88bf42133e6a407c977dcb2c931824e2", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/buff-148db8e64f3bcb3a)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests buff
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr] error[E0659]: `buff` is ambiguous (name vs any other name during import resolution)
[INFO] [stderr]  --> /opt/rustwide/workdir/src/lib.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub use buff::Buffer;
[INFO] [stderr]   |         ^^^^ ambiguous name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `buff` could refer to a crate passed with `--extern`
[INFO] [stderr]   = help: use `::buff` to refer to this crate unambiguously
[INFO] [stderr] note: `buff` could also refer to the module defined here
[INFO] [stderr]  --> /opt/rustwide/workdir/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | mod buff;
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr]   = help: use `crate::buff` to refer to this module unambiguously
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0659`.
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "499037a985d92be411f304b36d502f0c88bf42133e6a407c977dcb2c931824e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "499037a985d92be411f304b36d502f0c88bf42133e6a407c977dcb2c931824e2", kill_on_drop: false }`
[INFO] [stdout] 499037a985d92be411f304b36d502f0c88bf42133e6a407c977dcb2c931824e2