[INFO] updating cached repository mfs/box
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mfs/box
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mfs/box" "work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mfs/box" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mfs/box"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mfs/box'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3cef007c04a03b7abdb96611f209166ede476017
[INFO] sha for GitHub repo mfs/box: 3cef007c04a03b7abdb96611f209166ede476017
[INFO] validating manifest of mfs/box 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 mfs/box 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 mfs/box
[INFO] finished frobbing mfs/box
[INFO] frobbed toml for mfs/box written to work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box/Cargo.toml
[INFO] started frobbing mfs/box
[INFO] finished frobbing mfs/box
[INFO] frobbed toml for mfs/box written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mfs/box/Cargo.toml
[INFO] crate mfs/box 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 mfs/box 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box:/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] e494046a2154f16cf0019209a245470795108a5b0faec3d9e23f834eb1860e0d
[INFO] running `"docker" "start" "-a" "e494046a2154f16cf0019209a245470795108a5b0faec3d9e23f834eb1860e0d"`
[INFO] [stderr]    Compiling box v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/assembler.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut reader = BufReader::new(f);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `INSTRUCTIONS`
[INFO] [stderr]   --> src/bin/assembler.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / const INSTRUCTIONS: &'static [&'static str] = &[
[INFO] [stderr] 8  | |     "nop", "jcn", "fim", "src", "fin", "jin", "jun", "jms", "inc", "isz", "add", "sub", "ld",
[INFO] [stderr] 9  | |     "xch", "bbl", "ldm", "wrm", "wmp", "wrr", "wr0", "wr1", "wr2", "wr3", "sbm", "rdm", "rdr",
[INFO] [stderr] 10 | |     "adm", "rd0", "rd1", "rd2", "rd3", "clb", "iac", "cmc", "cma", "ral", "rar", "tcc", "dac",
[INFO] [stderr] 11 | |     "tcs", "stc", "daa", "kbp", "dcl"
[INFO] [stderr] 12 | | ];
[INFO] [stderr]    | |__^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Token`
[INFO] [stderr]   --> src/bin/assembler.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum Token {
[INFO] [stderr]    | ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "e494046a2154f16cf0019209a245470795108a5b0faec3d9e23f834eb1860e0d"`
[INFO] running `"docker" "rm" "-f" "e494046a2154f16cf0019209a245470795108a5b0faec3d9e23f834eb1860e0d"`
[INFO] [stdout] e494046a2154f16cf0019209a245470795108a5b0faec3d9e23f834eb1860e0d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] c17af8cf57ebb23f3fd4b43a0ab056ee6f798c90ad3987579f0342d4abca78a7
[INFO] running `"docker" "start" "-a" "c17af8cf57ebb23f3fd4b43a0ab056ee6f798c90ad3987579f0342d4abca78a7"`
[INFO] [stderr]    Compiling box v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/assembler.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut reader = BufReader::new(f);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `INSTRUCTIONS`
[INFO] [stderr]   --> src/bin/assembler.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / const INSTRUCTIONS: &'static [&'static str] = &[
[INFO] [stderr] 8  | |     "nop", "jcn", "fim", "src", "fin", "jin", "jun", "jms", "inc", "isz", "add", "sub", "ld",
[INFO] [stderr] 9  | |     "xch", "bbl", "ldm", "wrm", "wmp", "wrr", "wr0", "wr1", "wr2", "wr3", "sbm", "rdm", "rdr",
[INFO] [stderr] 10 | |     "adm", "rd0", "rd1", "rd2", "rd3", "clb", "iac", "cmc", "cma", "ral", "rar", "tcc", "dac",
[INFO] [stderr] 11 | |     "tcs", "stc", "daa", "kbp", "dcl"
[INFO] [stderr] 12 | | ];
[INFO] [stderr]    | |__^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Token`
[INFO] [stderr]   --> src/bin/assembler.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum Token {
[INFO] [stderr]    | ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `"docker" "inspect" "c17af8cf57ebb23f3fd4b43a0ab056ee6f798c90ad3987579f0342d4abca78a7"`
[INFO] running `"docker" "rm" "-f" "c17af8cf57ebb23f3fd4b43a0ab056ee6f798c90ad3987579f0342d4abca78a7"`
[INFO] [stdout] c17af8cf57ebb23f3fd4b43a0ab056ee6f798c90ad3987579f0342d4abca78a7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mfs/box:/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" "test" "--frozen"`
[INFO] [stdout] 49626eb38f19f210d8620b2354310a741a54e441de0df4bfaec199a38ba5701a
[INFO] running `"docker" "start" "-a" "49626eb38f19f210d8620b2354310a741a54e441de0df4bfaec199a38ba5701a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/assembler-4720c876e886de29
[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] [stderr]      Running /opt/crater/target/debug/deps/box-22c152175a638fca
[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" "49626eb38f19f210d8620b2354310a741a54e441de0df4bfaec199a38ba5701a"`
[INFO] running `"docker" "rm" "-f" "49626eb38f19f210d8620b2354310a741a54e441de0df4bfaec199a38ba5701a"`
[INFO] [stdout] 49626eb38f19f210d8620b2354310a741a54e441de0df4bfaec199a38ba5701a