[INFO] crate sufdb 0.1.7 is already in cache
[INFO] testing sufdb-0.1.7 against 1.38.0 for beta-1.39-1
[INFO] extracting crate sufdb 0.1.7 into work/builds/worker-6/source
[INFO] validating manifest of crates.io crate sufdb 0.1.7 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate sufdb 0.1.7
[INFO] finished tweaking crates.io crate sufdb 0.1.7
[INFO] tweaked toml for crates.io crate sufdb 0.1.7 written to work/builds/worker-6/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 7c8be0ca6238b7ccfda1c348ca6e7663d95c61b25e8d6f2a1af7889ee021a928
[INFO] running `"docker" "start" "-a" "7c8be0ca6238b7ccfda1c348ca6e7663d95c61b25e8d6f2a1af7889ee021a928"`
[INFO] [stderr]    Compiling suffix v1.1.0
[INFO] [stderr]    Compiling sufdb v0.1.7 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/btree.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/btree.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | / macro_rules! lg {
[INFO] [stderr] 19 | |     ($($tt:tt)*) => ({
[INFO] [stderr] 20 | |         use std::io::{Write, stderr};
[INFO] [stderr] 21 | |         (writeln!(&mut stderr(), $($tt)*)).unwrap();
[INFO] [stderr] 22 | |     });
[INFO] [stderr] 23 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `std::borrow::Cow<'_, [u32]>` is not an iterator
[INFO] [stderr]    --> src/btree.rs:216:22
[INFO] [stderr]     |
[INFO] [stderr] 216 |         for sufid in table {
[INFO] [stderr]     |                      ^^^^^ `std::borrow::Cow<'_, [u32]>` is not an iterator
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::iter::Iterator` is not implemented for `std::borrow::Cow<'_, [u32]>`
[INFO] [stderr]     = note: required by `std::iter::IntoIterator::into_iter`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0277, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `sufdb`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7c8be0ca6238b7ccfda1c348ca6e7663d95c61b25e8d6f2a1af7889ee021a928"`
[INFO] running `"docker" "rm" "-f" "7c8be0ca6238b7ccfda1c348ca6e7663d95c61b25e8d6f2a1af7889ee021a928"`
[INFO] [stdout] 7c8be0ca6238b7ccfda1c348ca6e7663d95c61b25e8d6f2a1af7889ee021a928