[INFO] updating cached repository whothey/firstfollow
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/whothey/firstfollow
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/whothey/firstfollow" "work/ex/beta-1.37-6/sources/1.36.0/gh/whothey/firstfollow"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/whothey/firstfollow'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/whothey/firstfollow" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ed70ddfb2c949e42afc1b1b7e51e22ef854739a2
[INFO] sha for GitHub repo whothey/firstfollow: ed70ddfb2c949e42afc1b1b7e51e22ef854739a2
[INFO] validating manifest of whothey/firstfollow 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 whothey/firstfollow 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 whothey/firstfollow
[INFO] finished frobbing whothey/firstfollow
[INFO] frobbed toml for whothey/firstfollow written to work/ex/beta-1.37-6/sources/1.36.0/gh/whothey/firstfollow/Cargo.toml
[INFO] started frobbing whothey/firstfollow
[INFO] finished frobbing whothey/firstfollow
[INFO] frobbed toml for whothey/firstfollow written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow/Cargo.toml
[INFO] crate whothey/firstfollow 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 whothey/firstfollow against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 464b6df3d68061da9b865edf5495a01b7a5be425114a736da9083f100f897b8a
[INFO] running `"docker" "start" "-a" "464b6df3d68061da9b865edf5495a01b7a5be425114a736da9083f100f897b8a"`
[INFO] [stderr]    Compiling libc v0.2.26
[INFO] [stderr]    Compiling thread_local v0.3.4
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr]    Compiling regex v0.2.2
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr]    Compiling firstfollow v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/formalgrammar/mod.rs:108:37
[INFO] [stderr]     |
[INFO] [stderr] 108 |                                 let mut set = first.get_mut(key).unwrap(); 
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/formalgrammar/mod.rs:181:33
[INFO] [stderr]     |
[INFO] [stderr] 181 |                             let mut set = follow_map.entry(target)
[INFO] [stderr]     |                                 ----^^^
[INFO] [stderr]     |                                 |
[INFO] [stderr]     |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_terminal`
[INFO] [stderr]   --> src/formalgrammar/symbol.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn is_terminal(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nonterminal`
[INFO] [stderr]   --> src/formalgrammar/symbol.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn is_nonterminal(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.33s
[INFO] running `"docker" "inspect" "464b6df3d68061da9b865edf5495a01b7a5be425114a736da9083f100f897b8a"`
[INFO] running `"docker" "rm" "-f" "464b6df3d68061da9b865edf5495a01b7a5be425114a736da9083f100f897b8a"`
[INFO] [stdout] 464b6df3d68061da9b865edf5495a01b7a5be425114a736da9083f100f897b8a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 89b03ccc6b1102b1d481fee9edeb07dd821cedd9c8c728555b9fffd914796846
[INFO] running `"docker" "start" "-a" "89b03ccc6b1102b1d481fee9edeb07dd821cedd9c8c728555b9fffd914796846"`
[INFO] [stderr]    Compiling firstfollow v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/formalgrammar/mod.rs:108:37
[INFO] [stderr]     |
[INFO] [stderr] 108 |                                 let mut set = first.get_mut(key).unwrap(); 
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/formalgrammar/mod.rs:181:33
[INFO] [stderr]     |
[INFO] [stderr] 181 |                             let mut set = follow_map.entry(target)
[INFO] [stderr]     |                                 ----^^^
[INFO] [stderr]     |                                 |
[INFO] [stderr]     |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_terminal`
[INFO] [stderr]   --> src/formalgrammar/symbol.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn is_terminal(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nonterminal`
[INFO] [stderr]   --> src/formalgrammar/symbol.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn is_nonterminal(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `"docker" "inspect" "89b03ccc6b1102b1d481fee9edeb07dd821cedd9c8c728555b9fffd914796846"`
[INFO] running `"docker" "rm" "-f" "89b03ccc6b1102b1d481fee9edeb07dd821cedd9c8c728555b9fffd914796846"`
[INFO] [stdout] 89b03ccc6b1102b1d481fee9edeb07dd821cedd9c8c728555b9fffd914796846
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/whothey/firstfollow:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 036f90a31e6c61f3b6248199fda9415da078fecd8832166fa66e7d2d8f2f52d0
[INFO] running `"docker" "start" "-a" "036f90a31e6c61f3b6248199fda9415da078fecd8832166fa66e7d2d8f2f52d0"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/firstfollow-75c75c1b1c9b7309
[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" "036f90a31e6c61f3b6248199fda9415da078fecd8832166fa66e7d2d8f2f52d0"`
[INFO] running `"docker" "rm" "-f" "036f90a31e6c61f3b6248199fda9415da078fecd8832166fa66e7d2d8f2f52d0"`
[INFO] [stdout] 036f90a31e6c61f3b6248199fda9415da078fecd8832166fa66e7d2d8f2f52d0