[INFO] fetching crate from 0.0.2...
[INFO] testing from-0.0.2 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate from 0.0.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate from 0.0.2 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate from 0.0.2
[INFO] finished tweaking crates.io crate from 0.0.2
[INFO] tweaked toml for crates.io crate from 0.0.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ea8e2c3c9f2332fc71d0b35a68fa5515c78af0df76841e91a26e60f2d2aa76e
[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" "7ea8e2c3c9f2332fc71d0b35a68fa5515c78af0df76841e91a26e60f2d2aa76e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ea8e2c3c9f2332fc71d0b35a68fa5515c78af0df76841e91a26e60f2d2aa76e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ea8e2c3c9f2332fc71d0b35a68fa5515c78af0df76841e91a26e60f2d2aa76e", kill_on_drop: false }`
[INFO] [stdout] 7ea8e2c3c9f2332fc71d0b35a68fa5515c78af0df76841e91a26e60f2d2aa76e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22fc7aa69d9a443b7ed65763a5758f7524e9eb2730398ef4ca8d7b7c9408d60a
[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" "22fc7aa69d9a443b7ed65763a5758f7524e9eb2730398ef4ca8d7b7c9408d60a", kill_on_drop: false }`
[INFO] [stderr]    Compiling from v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `as_slice` found for reference `&'a String` in the current scope
[INFO] [stdout]   --> src/lib.rs:25:43
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn from(x: &'a String) -> &'a str { x.as_slice() }
[INFO] [stdout]    |                                           ^^^^^^^^ method not found in `&'a String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `into_string` found for reference `&'a str` in the current scope
[INFO] [stdout]   --> src/lib.rs:29:39
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn from(x: &'a str) -> String { x.into_string() }
[INFO] [stdout]    |                                       ^^^^^^^^^^^ method not found in `&'a str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `from`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "22fc7aa69d9a443b7ed65763a5758f7524e9eb2730398ef4ca8d7b7c9408d60a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22fc7aa69d9a443b7ed65763a5758f7524e9eb2730398ef4ca8d7b7c9408d60a", kill_on_drop: false }`
[INFO] [stdout] 22fc7aa69d9a443b7ed65763a5758f7524e9eb2730398ef4ca8d7b7c9408d60a