[INFO] crate chars_input 0.2.2 is already in cache
[INFO] extracting crate chars_input 0.2.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/chars_input/0.2.2
[INFO] extracting crate chars_input 0.2.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/chars_input/0.2.2
[INFO] validating manifest of chars_input-0.2.2 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of chars_input-0.2.2 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing chars_input-0.2.2
[INFO] finished frobbing chars_input-0.2.2
[INFO] frobbed toml for chars_input-0.2.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/chars_input/0.2.2/Cargo.toml
[INFO] started frobbing chars_input-0.2.2
[INFO] finished frobbing chars_input-0.2.2
[INFO] frobbed toml for chars_input-0.2.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/chars_input/0.2.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing chars_input-0.2.2 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/chars_input/0.2.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 52281bc9c92f6464edb346a3761cd0cb81599f16a0009eae2b293dfd4c77a951
[INFO] running `"docker" "start" "-a" "52281bc9c92f6464edb346a3761cd0cb81599f16a0009eae2b293dfd4c77a951"`
[INFO] [stderr]    Compiling chars_input v0.2.2 (/opt/crater/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] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use chars::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use core::str::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use std::str::Chars;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable 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 stable 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 `R` in the current scope
[INFO] [stderr]    --> src/chars.rs:150:31
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 chars: reader.chars(),
[INFO] [stderr]     |                               ^^^^^
[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" "52281bc9c92f6464edb346a3761cd0cb81599f16a0009eae2b293dfd4c77a951"`
[INFO] running `"docker" "rm" "-f" "52281bc9c92f6464edb346a3761cd0cb81599f16a0009eae2b293dfd4c77a951"`
[INFO] [stdout] 52281bc9c92f6464edb346a3761cd0cb81599f16a0009eae2b293dfd4c77a951