[INFO] updating cached repository hmc-memsafe-2016f/wk2-starter
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/hmc-memsafe-2016f/wk2-starter
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/hmc-memsafe-2016f/wk2-starter" "work/ex/beta-1.38-1/sources/1.37.0/gh/hmc-memsafe-2016f/wk2-starter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/hmc-memsafe-2016f/wk2-starter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hmc-memsafe-2016f/wk2-starter" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hmc-memsafe-2016f/wk2-starter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hmc-memsafe-2016f/wk2-starter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dde90e4a050fbfb2d74e08d7736e20dc87045162
[INFO] sha for GitHub repo hmc-memsafe-2016f/wk2-starter: dde90e4a050fbfb2d74e08d7736e20dc87045162
[INFO] validating manifest of hmc-memsafe-2016f/wk2-starter 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 hmc-memsafe-2016f/wk2-starter 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 hmc-memsafe-2016f/wk2-starter
[INFO] finished frobbing hmc-memsafe-2016f/wk2-starter
[INFO] frobbed toml for hmc-memsafe-2016f/wk2-starter written to work/ex/beta-1.38-1/sources/1.37.0/gh/hmc-memsafe-2016f/wk2-starter/Cargo.toml
[INFO] started frobbing hmc-memsafe-2016f/wk2-starter
[INFO] finished frobbing hmc-memsafe-2016f/wk2-starter
[INFO] frobbed toml for hmc-memsafe-2016f/wk2-starter written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hmc-memsafe-2016f/wk2-starter/Cargo.toml
[INFO] crate hmc-memsafe-2016f/wk2-starter 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] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/hmc-memsafe-2016f/wk2-starter/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 hmc-memsafe-2016f/wk2-starter 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-4/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/hmc-memsafe-2016f/wk2-starter:/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] 524305c2af77c63615663bcfdd8a32421f0ee074ffd9e85844d3745d86686809
[INFO] running `"docker" "start" "-a" "524305c2af77c63615663bcfdd8a32421f0ee074ffd9e85844d3745d86686809"`
[INFO] [stderr]    Compiling wk2-starter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: enum is never used: `Expr`
[INFO] [stderr]  --> src/expr/expr.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub enum Expr {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `BinOp`
[INFO] [stderr]   --> src/expr/expr.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub enum BinOp {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `evaluate`
[INFO] [stderr]   --> src/expr/expr.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `operation_count`
[INFO] [stderr]   --> src/expr/expr.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `depth`
[INFO] [stderr]   --> src/expr/expr.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn depth(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `"docker" "inspect" "524305c2af77c63615663bcfdd8a32421f0ee074ffd9e85844d3745d86686809"`
[INFO] running `"docker" "rm" "-f" "524305c2af77c63615663bcfdd8a32421f0ee074ffd9e85844d3745d86686809"`
[INFO] [stdout] 524305c2af77c63615663bcfdd8a32421f0ee074ffd9e85844d3745d86686809
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/hmc-memsafe-2016f/wk2-starter:/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] a4d9faaa23cebf16318fef0dbdc571c27fa781055b5d8f0df8f67069a9b0b6fc
[INFO] running `"docker" "start" "-a" "a4d9faaa23cebf16318fef0dbdc571c27fa781055b5d8f0df8f67069a9b0b6fc"`
[INFO] [stderr]    Compiling wk2-starter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: enum is never used: `Expr`
[INFO] [stderr]  --> src/expr/expr.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub enum Expr {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `BinOp`
[INFO] [stderr]   --> src/expr/expr.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub enum BinOp {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `evaluate`
[INFO] [stderr]   --> src/expr/expr.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn evaluate(&self) -> isize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `operation_count`
[INFO] [stderr]   --> src/expr/expr.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn operation_count(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `depth`
[INFO] [stderr]   --> src/expr/expr.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn depth(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "a4d9faaa23cebf16318fef0dbdc571c27fa781055b5d8f0df8f67069a9b0b6fc"`
[INFO] running `"docker" "rm" "-f" "a4d9faaa23cebf16318fef0dbdc571c27fa781055b5d8f0df8f67069a9b0b6fc"`
[INFO] [stdout] a4d9faaa23cebf16318fef0dbdc571c27fa781055b5d8f0df8f67069a9b0b6fc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/hmc-memsafe-2016f/wk2-starter:/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] 9a9a1fc30c01e3ed72343725b99b1c3174cb82952d1ea041aacb2b03ed43082b
[INFO] running `"docker" "start" "-a" "9a9a1fc30c01e3ed72343725b99b1c3174cb82952d1ea041aacb2b03ed43082b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/repl-5d3937aeebecc143
[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" "9a9a1fc30c01e3ed72343725b99b1c3174cb82952d1ea041aacb2b03ed43082b"`
[INFO] running `"docker" "rm" "-f" "9a9a1fc30c01e3ed72343725b99b1c3174cb82952d1ea041aacb2b03ed43082b"`
[INFO] [stdout] 9a9a1fc30c01e3ed72343725b99b1c3174cb82952d1ea041aacb2b03ed43082b