[INFO] cloning repository https://github.com/tqdv/switchable
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tqdv/switchable" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftqdv%2Fswitchable", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftqdv%2Fswitchable'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7ce4eb2f602b862679433cb8dba039d25ae20fc1
[INFO] testing tqdv/switchable against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftqdv%2Fswitchable" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tqdv/switchable on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tqdv/switchable
[INFO] finished tweaking git repo https://github.com/tqdv/switchable
[INFO] tweaked toml for git repo https://github.com/tqdv/switchable written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/tqdv/switchable already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7240905871ffb9bc2087bc766301286811ebe38bd7bd7cb468d86335378d6be5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7240905871ffb9bc2087bc766301286811ebe38bd7bd7cb468d86335378d6be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7240905871ffb9bc2087bc766301286811ebe38bd7bd7cb468d86335378d6be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7240905871ffb9bc2087bc766301286811ebe38bd7bd7cb468d86335378d6be5", kill_on_drop: false }`
[INFO] [stdout] 7240905871ffb9bc2087bc766301286811ebe38bd7bd7cb468d86335378d6be5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2392f1e52f102d66833abf7dbc5664259bce901d3653cf7e7fd8a08199aacce8
[INFO] running `Command { std: "docker" "start" "-a" "2392f1e52f102d66833abf7dbc5664259bce901d3653cf7e7fd8a08199aacce8", 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] [stderr]    Compiling proc-macro2 v1.0.13
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.22
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling tear v0.2.0
[INFO] [stderr]    Compiling getopts v0.2.21
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling aho-corasick v0.7.10
[INFO] [stderr]    Compiling quote v1.0.5
[INFO] [stderr]    Compiling dirs-sys v0.3.4
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling regex v1.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]    Compiling thiserror-impl v1.0.19
[INFO] [stderr]    Compiling thiserror v1.0.19
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling switchable v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0034]: multiple applicable items in scope
[INFO] [stdout]   --> src/app.rs:79:6
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 .reduce(|a, b| format!("{} {}", a, b)).unwrap(); // We checked is_empty
[INFO] [stdout]    |                  ^^^^^^ multiple `reduce` found
[INFO] [stdout]    |
[INFO] [stdout] note: candidate #1 is defined in an impl of the trait `slang::IterExt` for the type `Me`
[INFO] [stdout]   --> src/slang.rs:19:2
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn reduce (mut self, f :impl FnMut(T, T) -> T) -> Option<T> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: candidate #2 is defined in an impl of the trait `Iterator` for the type `std::iter::Map<I, F>`
[INFO] [stdout] help: disambiguate the associated function for candidate #1
[INFO] [stdout]    |
[INFO] [stdout] 77 ~             let aliases_str = slang::IterExt::reduce(to_rm.iter()
[INFO] [stdout] 78 ~                 .map(|v| format!("'{}'", v)), |a, b| format!("{} {}", a, b)).unwrap(); // We checked is_empty
[INFO] [stdout]    |
[INFO] [stdout] help: disambiguate the associated function for candidate #2
[INFO] [stdout]    |
[INFO] [stdout] 77 ~             let aliases_str = Iterator::reduce(to_rm.iter()
[INFO] [stdout] 78 ~                 .map(|v| format!("'{}'", v)), |a, b| format!("{} {}", a, b)).unwrap(); // We checked is_empty
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0034`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `switchable` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2392f1e52f102d66833abf7dbc5664259bce901d3653cf7e7fd8a08199aacce8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2392f1e52f102d66833abf7dbc5664259bce901d3653cf7e7fd8a08199aacce8", kill_on_drop: false }`
[INFO] [stdout] 2392f1e52f102d66833abf7dbc5664259bce901d3653cf7e7fd8a08199aacce8