[INFO] updating cached repository danreeves/rust-tests
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/danreeves/rust-tests
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/danreeves/rust-tests" "work/ex/beta-1.38-1/sources/1.37.0/gh/danreeves/rust-tests"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/danreeves/rust-tests'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/danreeves/rust-tests" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danreeves/rust-tests"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danreeves/rust-tests'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 14017c607dbca26f2ae9f27500d46a91aaed3402
[INFO] sha for GitHub repo danreeves/rust-tests: 14017c607dbca26f2ae9f27500d46a91aaed3402
[INFO] validating manifest of danreeves/rust-tests 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 danreeves/rust-tests 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 danreeves/rust-tests
[INFO] finished frobbing danreeves/rust-tests
[INFO] frobbed toml for danreeves/rust-tests written to work/ex/beta-1.38-1/sources/1.37.0/gh/danreeves/rust-tests/Cargo.toml
[INFO] started frobbing danreeves/rust-tests
[INFO] finished frobbing danreeves/rust-tests
[INFO] frobbed toml for danreeves/rust-tests written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danreeves/rust-tests/Cargo.toml
[INFO] crate danreeves/rust-tests already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing danreeves/rust-tests 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/danreeves/rust-tests:/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] 663627fa68525b28318a1055a129be7d3b6dbd0f1e11177132ea4dfc7520eef3
[INFO] running `"docker" "start" "-a" "663627fa68525b28318a1055a129be7d3b6dbd0f1e11177132ea4dfc7520eef3"`
[INFO] [stderr]    Compiling rust-tests v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::cmp::PartialOrd`
[INFO] [stderr]  --> src/generics.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp::PartialOrd;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/hashmaps.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::another::thing`
[INFO] [stderr]  --> src/modules/mod.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use self::another::thing;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stderr]  --> src/smart_pointers.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::ops::{Deref, DerefMut};
[INFO] [stderr]   |                ^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Any`, `TypeId`
[INFO] [stderr]  --> src/structs.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::any::{Any, TypeId};
[INFO] [stderr]   |                ^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::f32::consts::PI`
[INFO] [stderr]  --> src/structs.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::f32::consts::PI;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `rust_tests`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: Could not compile `rust-tests`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "663627fa68525b28318a1055a129be7d3b6dbd0f1e11177132ea4dfc7520eef3"`
[INFO] running `"docker" "rm" "-f" "663627fa68525b28318a1055a129be7d3b6dbd0f1e11177132ea4dfc7520eef3"`
[INFO] [stdout] 663627fa68525b28318a1055a129be7d3b6dbd0f1e11177132ea4dfc7520eef3