[INFO] crate cron-bugfix-version 0.4.0 is already in cache
[INFO] extracting crate cron-bugfix-version 0.4.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/cron-bugfix-version/0.4.0
[INFO] extracting crate cron-bugfix-version 0.4.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cron-bugfix-version/0.4.0
[INFO] validating manifest of cron-bugfix-version-0.4.0 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 cron-bugfix-version-0.4.0 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 cron-bugfix-version-0.4.0
[INFO] finished frobbing cron-bugfix-version-0.4.0
[INFO] frobbed toml for cron-bugfix-version-0.4.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/cron-bugfix-version/0.4.0/Cargo.toml
[INFO] started frobbing cron-bugfix-version-0.4.0
[INFO] finished frobbing cron-bugfix-version-0.4.0
[INFO] frobbed toml for cron-bugfix-version-0.4.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cron-bugfix-version/0.4.0/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 cron-bugfix-version-0.4.0 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cron-bugfix-version/0.4.0:/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] 8540639d68d38edba79f673884caa0c89c6e633d4ad26aad607b5be88710604a
[INFO] running `"docker" "start" "-a" "8540639d68d38edba79f673884caa0c89c6e633d4ad26aad607b5be88710604a"`
[INFO] [stderr]    Compiling nom v2.1.0
[INFO] [stderr]    Compiling cron-bugfix-version v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::collections::range`
[INFO] [stderr]   --> src/time_unit/mod.rs:18:23
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::collections::range::{RangeArgument};
[INFO] [stderr]    |                       ^^^^^ could not find `range` in `collections`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(collections_range)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(conservative_impl_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(iterator_step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Duration`
[INFO] [stderr]  --> src/schedule.rs:4:29
[INFO] [stderr]   |
[INFO] [stderr] 4 | use chrono::{Utc, DateTime, Duration, Datelike, Timelike};
[INFO] [stderr]   |                             ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Duration` is imported redundantly
[INFO] [stderr]   --> src/schedule.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 4  | use chrono::{Utc, DateTime, Duration, Datelike, Timelike};
[INFO] [stderr]    |                             -------- the item `Duration` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 73 |         use chrono::Duration;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `cron-bugfix-version`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8540639d68d38edba79f673884caa0c89c6e633d4ad26aad607b5be88710604a"`
[INFO] running `"docker" "rm" "-f" "8540639d68d38edba79f673884caa0c89c6e633d4ad26aad607b5be88710604a"`
[INFO] [stdout] 8540639d68d38edba79f673884caa0c89c6e633d4ad26aad607b5be88710604a