[INFO] fetching crate prefix-map 0.3.1...
[INFO] testing prefix-map-0.3.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate prefix-map 0.3.1 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate prefix-map 0.3.1 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prefix-map 0.3.1
[INFO] finished tweaking crates.io crate prefix-map 0.3.1
[INFO] tweaked toml for crates.io crate prefix-map 0.3.1 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5bb87acb2fcdf1f17f33b2f24c8c8c4d2b0c9c22b07db55f00caa9fa6d7928a3
[INFO] running `Command { std: "docker" "start" "-a" "5bb87acb2fcdf1f17f33b2f24c8c8c4d2b0c9c22b07db55f00caa9fa6d7928a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5bb87acb2fcdf1f17f33b2f24c8c8c4d2b0c9c22b07db55f00caa9fa6d7928a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bb87acb2fcdf1f17f33b2f24c8c8c4d2b0c9c22b07db55f00caa9fa6d7928a3", kill_on_drop: false }`
[INFO] [stdout] 5bb87acb2fcdf1f17f33b2f24c8c8c4d2b0c9c22b07db55f00caa9fa6d7928a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 634cc65f05dc7d36cc05f6750a4ff9a8606fb076622330684229d732e58985cf
[INFO] running `Command { std: "docker" "start" "-a" "634cc65f05dc7d36cc05f6750a4ff9a8606fb076622330684229d732e58985cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-segmentation v0.1.3
[INFO] [stderr]    Compiling prefix-map v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(associated_type_defaults, iter_arith, test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `<Self as ToOwned>::Owned: OwnedPrefix` is not satisfied
[INFO] [stdout]   --> src/prefix.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         <Self as ToOwned>::Owned;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `OwnedPrefix` is not implemented for `<Self as ToOwned>::Owned`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `ToPrefix::OwnedPrefix`
[INFO] [stdout]   --> src/prefix.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 |     type OwnedPrefix: OwnedPrefix<Item=Self::OwnedItem> + Borrow<Self> =
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `ToPrefix::OwnedPrefix`
[INFO] [stdout] help: consider further restricting the associated type
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub trait ToPrefix: ToOwned where <Self as ToOwned>::Owned: OwnedPrefix {
[INFO] [stdout]    |                             +++++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0275]: overflow evaluating the requirement `<Self as ToPrefix>::OwnedItem == _`
[INFO] [stdout]   --> src/prefix.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         <Self::OwnedPrefix as OwnedPrefix>::Item;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0275, E0277, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0275`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `prefix-map` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "634cc65f05dc7d36cc05f6750a4ff9a8606fb076622330684229d732e58985cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "634cc65f05dc7d36cc05f6750a4ff9a8606fb076622330684229d732e58985cf", kill_on_drop: false }`
[INFO] [stdout] 634cc65f05dc7d36cc05f6750a4ff9a8606fb076622330684229d732e58985cf