[INFO] updating cached repository richardbrodie/mercury
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/richardbrodie/mercury
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/richardbrodie/mercury" "work/ex/beta-1.38-1/sources/1.37.0/gh/richardbrodie/mercury"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/richardbrodie/mercury'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/richardbrodie/mercury" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f0ae094a094cfabe1c87c3a1b4a259c0f2629aff
[INFO] sha for GitHub repo richardbrodie/mercury: f0ae094a094cfabe1c87c3a1b4a259c0f2629aff
[INFO] validating manifest of richardbrodie/mercury 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 richardbrodie/mercury 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 richardbrodie/mercury
[INFO] finished frobbing richardbrodie/mercury
[INFO] frobbed toml for richardbrodie/mercury written to work/ex/beta-1.38-1/sources/1.37.0/gh/richardbrodie/mercury/Cargo.toml
[INFO] started frobbing richardbrodie/mercury
[INFO] finished frobbing richardbrodie/mercury
[INFO] frobbed toml for richardbrodie/mercury written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury/Cargo.toml
[INFO] crate richardbrodie/mercury 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing richardbrodie/mercury against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 19235d732c9ce2736310bf0b4c280e08972d70cc13f9e836e763aec53ec514bc
[INFO] running `"docker" "start" "-a" "19235d732c9ce2736310bf0b4c280e08972d70cc13f9e836e763aec53ec514bc"`
[INFO] [stderr]    Compiling dirs v1.0.4
[INFO] [stderr]    Compiling regex-syntax v0.6.2
[INFO] [stderr]    Compiling yaml-rust v0.4.2
[INFO] [stderr]    Compiling syn v0.15.15
[INFO] [stderr]    Compiling backtrace v0.3.9
[INFO] [stderr]    Compiling serde_yaml v0.8.7
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]    Compiling failure_derive v0.1.3
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling pretty_env_logger v0.2.4
[INFO] [stderr]    Compiling failure v0.1.3
[INFO] [stderr]    Compiling dotenv v0.13.0
[INFO] [stderr]    Compiling mercury v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/types.rs:3:21
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{self, File};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Feed`
[INFO] [stderr]  --> src/types.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Feed {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Item`
[INFO] [stderr]   --> src/types.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub struct Item {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/types.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |             fs::create_dir(&self.feed_path);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 59.88s
[INFO] running `"docker" "inspect" "19235d732c9ce2736310bf0b4c280e08972d70cc13f9e836e763aec53ec514bc"`
[INFO] running `"docker" "rm" "-f" "19235d732c9ce2736310bf0b4c280e08972d70cc13f9e836e763aec53ec514bc"`
[INFO] [stdout] 19235d732c9ce2736310bf0b4c280e08972d70cc13f9e836e763aec53ec514bc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] efb2bca0a915c04905d8fbcc5d5860b943402e562d1fa13330b67ef66dc90690
[INFO] running `"docker" "start" "-a" "efb2bca0a915c04905d8fbcc5d5860b943402e562d1fa13330b67ef66dc90690"`
[INFO] [stderr]    Compiling mercury v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/types.rs:3:21
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{self, File};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Feed`
[INFO] [stderr]  --> src/types.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Feed {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Item`
[INFO] [stderr]   --> src/types.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub struct Item {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/types.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |             fs::create_dir(&self.feed_path);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.53s
[INFO] running `"docker" "inspect" "efb2bca0a915c04905d8fbcc5d5860b943402e562d1fa13330b67ef66dc90690"`
[INFO] running `"docker" "rm" "-f" "efb2bca0a915c04905d8fbcc5d5860b943402e562d1fa13330b67ef66dc90690"`
[INFO] [stdout] efb2bca0a915c04905d8fbcc5d5860b943402e562d1fa13330b67ef66dc90690
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardbrodie/mercury:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] abbe490e8d3665fbc781f2360e4f2ec388c1687a59de896887152a189f36a9d9
[INFO] running `"docker" "start" "-a" "abbe490e8d3665fbc781f2360e4f2ec388c1687a59de896887152a189f36a9d9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mercury-dc791ccaf6239847
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "abbe490e8d3665fbc781f2360e4f2ec388c1687a59de896887152a189f36a9d9"`
[INFO] running `"docker" "rm" "-f" "abbe490e8d3665fbc781f2360e4f2ec388c1687a59de896887152a189f36a9d9"`
[INFO] [stdout] abbe490e8d3665fbc781f2360e4f2ec388c1687a59de896887152a189f36a9d9