[INFO] updating cached repository jeffusan/rust_fun
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jeffusan/rust_fun
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jeffusan/rust_fun" "work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jeffusan/rust_fun" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jeffusan/rust_fun"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jeffusan/rust_fun'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0db63d2afabccf1934eb3df46b5dc33064891761
[INFO] sha for GitHub repo jeffusan/rust_fun: 0db63d2afabccf1934eb3df46b5dc33064891761
[INFO] validating manifest of jeffusan/rust_fun on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jeffusan/rust_fun on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jeffusan/rust_fun
[INFO] finished frobbing jeffusan/rust_fun
[INFO] frobbed toml for jeffusan/rust_fun written to work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun/Cargo.toml
[INFO] started frobbing jeffusan/rust_fun
[INFO] finished frobbing jeffusan/rust_fun
[INFO] frobbed toml for jeffusan/rust_fun written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jeffusan/rust_fun/Cargo.toml
[INFO] crate jeffusan/rust_fun already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jeffusan/rust_fun against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 9a672babb20a72969d5dd8a4f10578f02f9b780d96b5175ac43e5bfb9a4ad2d4
[INFO] running `"docker" "start" "-a" "9a672babb20a72969d5dd8a4f10578f02f9b780d96b5175ac43e5bfb9a4ad2d4"`
[INFO] [stderr]    Compiling hello-world v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Stack`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     pub struct Stack {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         pub fn new() -> Stack {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |         pub fn push(&mut self, item: i8) {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]   --> src/main.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         pub fn pop(&mut self) -> Option<i8> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `max`
[INFO] [stderr]   --> src/main.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         pub fn max(&self) -> i8 {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `"docker" "inspect" "9a672babb20a72969d5dd8a4f10578f02f9b780d96b5175ac43e5bfb9a4ad2d4"`
[INFO] running `"docker" "rm" "-f" "9a672babb20a72969d5dd8a4f10578f02f9b780d96b5175ac43e5bfb9a4ad2d4"`
[INFO] [stdout] 9a672babb20a72969d5dd8a4f10578f02f9b780d96b5175ac43e5bfb9a4ad2d4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 072643ba99cd997311dd5a4da4c9a7e1609f737b034e6ca11cf8d084c91cfda3
[INFO] running `"docker" "start" "-a" "072643ba99cd997311dd5a4da4c9a7e1609f737b034e6ca11cf8d084c91cfda3"`
[INFO] [stderr]    Compiling hello-world v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `"docker" "inspect" "072643ba99cd997311dd5a4da4c9a7e1609f737b034e6ca11cf8d084c91cfda3"`
[INFO] running `"docker" "rm" "-f" "072643ba99cd997311dd5a4da4c9a7e1609f737b034e6ca11cf8d084c91cfda3"`
[INFO] [stdout] 072643ba99cd997311dd5a4da4c9a7e1609f737b034e6ca11cf8d084c91cfda3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/jeffusan/rust_fun:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 8106cdb879eb64c85b9e64aba0a4ba6d587b657bf1cac8024e60927cdf839bdd
[INFO] running `"docker" "start" "-a" "8106cdb879eb64c85b9e64aba0a4ba6d587b657bf1cac8024e60927cdf839bdd"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hello_world-bc04ba0ee6f2fb6b
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test stack::max_test ... ok
[INFO] [stdout] test stack::push_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "8106cdb879eb64c85b9e64aba0a4ba6d587b657bf1cac8024e60927cdf839bdd"`
[INFO] running `"docker" "rm" "-f" "8106cdb879eb64c85b9e64aba0a4ba6d587b657bf1cac8024e60927cdf839bdd"`
[INFO] [stdout] 8106cdb879eb64c85b9e64aba0a4ba6d587b657bf1cac8024e60927cdf839bdd