[INFO] fetching crate xstd 0.2.0...
[INFO] testing xstd-0.2.0 against beta-2021-09-12 for beta-1.56-2
[INFO] extracting crate xstd 0.2.0 into /workspace/builds/worker-46/source
[INFO] validating manifest of crates.io crate xstd 0.2.0 on toolchain beta-2021-09-12
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate xstd 0.2.0
[INFO] finished tweaking crates.io crate xstd 0.2.0
[INFO] tweaked toml for crates.io crate xstd 0.2.0 written to /workspace/builds/worker-46/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "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-2021-09-12" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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-2021-09-12" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea29bc77fc81ca9662439cbce39c0ce14950c94bfd60caded59fa2c764c577a1
[INFO] running `Command { std: "docker" "start" "-a" "ea29bc77fc81ca9662439cbce39c0ce14950c94bfd60caded59fa2c764c577a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea29bc77fc81ca9662439cbce39c0ce14950c94bfd60caded59fa2c764c577a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea29bc77fc81ca9662439cbce39c0ce14950c94bfd60caded59fa2c764c577a1", kill_on_drop: false }`
[INFO] [stdout] ea29bc77fc81ca9662439cbce39c0ce14950c94bfd60caded59fa2c764c577a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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-2021-09-12" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e5b5f9c5a8a3b55995fce73c375fb9db550e8bf6624e0d781d52979cb2513d8
[INFO] running `Command { std: "docker" "start" "-a" "0e5b5f9c5a8a3b55995fce73c375fb9db550e8bf6624e0d781d52979cb2513d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling xstd v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0034]: multiple applicable items in scope
[INFO] [stdout]   --> src/vec.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 |             .intersperse(&"\n")
[INFO] [stdout]    |              ^^^^^^^^^^^ multiple `intersperse` found
[INFO] [stdout]    |
[INFO] [stdout] note: candidate #1 is defined in an impl of the trait `intersperse_iter::IntersperseIterAdapter` for the type `I`
[INFO] [stdout]   --> src/iter/intersperse_iter.rs:2:5
[INFO] [stdout]    |
[INFO] [stdout] 2  | /     fn intersperse(self, elem: Self::Item) -> IntersperseIter<Self>
[INFO] [stdout] 3  | |     where
[INFO] [stdout] 4  | |         Self: Sized,
[INFO] [stdout] 5  | |         Self::Item: Clone,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout]    = note: candidate #2 is defined in an impl of the trait `Iterator` for the type `std::slice::Iter<'a, T>`
[INFO] [stdout] help: disambiguate the associated function for candidate #1
[INFO] [stdout]    |
[INFO] [stdout] 20 |         intersperse_iter::IntersperseIterAdapter::intersperse(self.iter(), &"\n")
[INFO] [stdout]    |
[INFO] [stdout] help: disambiguate the associated function for candidate #2
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Iterator::intersperse(self.iter(), &"\n")
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0034]: multiple applicable items in scope
[INFO] [stdout]   --> src/vec.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 |             .intersperse(&" ")
[INFO] [stdout]    |              ^^^^^^^^^^^ multiple `intersperse` found
[INFO] [stdout]    |
[INFO] [stdout] note: candidate #1 is defined in an impl of the trait `intersperse_iter::IntersperseIterAdapter` for the type `I`
[INFO] [stdout]   --> src/iter/intersperse_iter.rs:2:5
[INFO] [stdout]    |
[INFO] [stdout] 2  | /     fn intersperse(self, elem: Self::Item) -> IntersperseIter<Self>
[INFO] [stdout] 3  | |     where
[INFO] [stdout] 4  | |         Self: Sized,
[INFO] [stdout] 5  | |         Self::Item: Clone,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout]    = note: candidate #2 is defined in an impl of the trait `Iterator` for the type `std::slice::Iter<'a, T>`
[INFO] [stdout] help: disambiguate the associated function for candidate #1
[INFO] [stdout]    |
[INFO] [stdout] 44 |         intersperse_iter::IntersperseIterAdapter::intersperse(self.iter(), &" ")
[INFO] [stdout]    |
[INFO] [stdout] help: disambiguate the associated function for candidate #2
[INFO] [stdout]    |
[INFO] [stdout] 44 |         Iterator::intersperse(self.iter(), &" ")
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::prelude`
[INFO] [stdout]  --> src/vec.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0034`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xstd` due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "0e5b5f9c5a8a3b55995fce73c375fb9db550e8bf6624e0d781d52979cb2513d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e5b5f9c5a8a3b55995fce73c375fb9db550e8bf6624e0d781d52979cb2513d8", kill_on_drop: false }`
[INFO] [stdout] 0e5b5f9c5a8a3b55995fce73c375fb9db550e8bf6624e0d781d52979cb2513d8