[INFO] updating cached repository https://github.com/guswns0528/matrix-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 76f338500a7834f5192d8f0bebfa0c003af59a06
[INFO] testing guswns0528/matrix-rs against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguswns0528%2Fmatrix-rs" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guswns0528/matrix-rs 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 git repo https://github.com/guswns0528/matrix-rs
[INFO] finished tweaking git repo https://github.com/guswns0528/matrix-rs
[INFO] tweaked toml for git repo https://github.com/guswns0528/matrix-rs written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/guswns0528/matrix-rs already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-0/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/jeaye/ncurses-rs.git`
[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-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/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] 9681841e449ad112ba4eb8db941d67c53d2d7aaf8cd7a7a6a9f880780f3621bc
[INFO] running `"docker" "start" "-a" "9681841e449ad112ba4eb8db941d67c53d2d7aaf8cd7a7a6a9f880780f3621bc"`
[INFO] [stderr]    Compiling ncurses v5.99.0 (https://github.com/jeaye/ncurses-rs.git#a52dbb37)
[INFO] [stderr]    Compiling matrix v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rand::sample`
[INFO] [stderr]  --> src/matrix.rs:6:32
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rand::{random, thread_rng, sample};
[INFO] [stderr]   |                                ^^^^^^ no `sample` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `funcs` in `libc`
[INFO] [stderr]  --> src/matrix.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use self::libc::funcs::posix88::unistd::usleep;
[INFO] [stderr]   |                 ^^^^^ could not find `funcs` in `libc`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved imports `rand::distributions::IndependentSample`, `rand::distributions::Range`
[INFO] [stderr]  --> src/matrix.rs:7:27
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rand::distributions::{IndependentSample, Range};
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^^^^  ^^^^^ no `Range` in `distributions`
[INFO] [stderr]   |                           |
[INFO] [stderr]   |                           no `IndependentSample` in `distributions`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `usleep` in this scope
[INFO] [stderr]   --> src/matrix.rs:63:17
[INFO] [stderr]    |
[INFO] [stderr] 63 |                 usleep((1000000.0 / REFRESH_RATE as f64) as u32);
[INFO] [stderr]    |                 ^^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]    |
[INFO] [stderr] 5  | use matrix::libc::usleep;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(core)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(libc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `random`
[INFO] [stderr]  --> src/matrix.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rand::{random, thread_rng, sample};
[INFO] [stderr]   |            ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::libc::funcs::posix88::unistd::usleep`
[INFO] [stderr]  --> src/matrix.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use self::libc::funcs::posix88::unistd::usleep;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]  --> src/matrix.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | extern crate libc;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 7 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0432, E0433, E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `matrix`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9681841e449ad112ba4eb8db941d67c53d2d7aaf8cd7a7a6a9f880780f3621bc"`
[INFO] running `"docker" "rm" "-f" "9681841e449ad112ba4eb8db941d67c53d2d7aaf8cd7a7a6a9f880780f3621bc"`
[INFO] [stdout] 9681841e449ad112ba4eb8db941d67c53d2d7aaf8cd7a7a6a9f880780f3621bc