[INFO] crate chars_input 0.2.2 is already in cache
[INFO] testing chars_input-0.2.2 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate chars_input 0.2.2 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate chars_input 0.2.2 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate chars_input 0.2.2
[INFO] finished tweaking crates.io crate chars_input 0.2.2
[INFO] tweaked toml for crates.io crate chars_input 0.2.2 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] c6b946683d2101dae8f01c134ec0f1eb11d682447e2ed30be9aef5e7d1d1c8b3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "c6b946683d2101dae8f01c134ec0f1eb11d682447e2ed30be9aef5e7d1d1c8b3"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling chars_input v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stderr]    --> src/chars.rs:140:20
[INFO] [stderr]     |
[INFO] [stderr] 140 |         chars: io::Chars<R>,
[INFO] [stderr]     |                    ^^^^^ not found in `io`
[INFO] [stderr]     |
[INFO] [stderr] help: consider importing one of these items
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use alloc::str::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use chars::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use core::str::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:30
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![cfg_attr(feature = "std", feature(io))]
[INFO] [stderr]   |                              ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `chars` found for type parameter `R` in the current scope
[INFO] [stderr]    --> src/chars.rs:150:31
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 chars: reader.chars(),
[INFO] [stderr]     |                               ^^^^^ method not found in `R`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0412, E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0412`.
[INFO] [stderr] error: could not compile `chars_input`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c6b946683d2101dae8f01c134ec0f1eb11d682447e2ed30be9aef5e7d1d1c8b3"`
[INFO] running `"docker" "rm" "-f" "c6b946683d2101dae8f01c134ec0f1eb11d682447e2ed30be9aef5e7d1d1c8b3"`
[INFO] [stdout] c6b946683d2101dae8f01c134ec0f1eb11d682447e2ed30be9aef5e7d1d1c8b3