[INFO] updating cached repository danzhu/rust-fin
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/danzhu/rust-fin
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/danzhu/rust-fin" "work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/danzhu/rust-fin" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danzhu/rust-fin"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danzhu/rust-fin'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 523dcb02f1cc5196560acaa714cde4f281a37fed
[INFO] sha for GitHub repo danzhu/rust-fin: 523dcb02f1cc5196560acaa714cde4f281a37fed
[INFO] validating manifest of danzhu/rust-fin 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 danzhu/rust-fin 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 danzhu/rust-fin
[INFO] finished frobbing danzhu/rust-fin
[INFO] frobbed toml for danzhu/rust-fin written to work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin/Cargo.toml
[INFO] started frobbing danzhu/rust-fin
[INFO] finished frobbing danzhu/rust-fin
[INFO] frobbed toml for danzhu/rust-fin written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/danzhu/rust-fin/Cargo.toml
[INFO] crate danzhu/rust-fin 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 danzhu/rust-fin 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin:/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] c5a1401316020b283c57ca175f9d1c0c374eba6bd2ef50b477ed0d7c4515ce72
[INFO] running `"docker" "start" "-a" "c5a1401316020b283c57ca175f9d1c0c374eba6bd2ef50b477ed0d7c4515ce72"`
[INFO] [stderr]    Compiling fin v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ast_gen.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let mut res = Resolver {
[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/code_gen.rs:83:17
[INFO] [stderr]    |
[INFO] [stderr] 83 |             let mut bb = self.def.add_block();
[INFO] [stderr]    |                 ----^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.18s
[INFO] running `"docker" "inspect" "c5a1401316020b283c57ca175f9d1c0c374eba6bd2ef50b477ed0d7c4515ce72"`
[INFO] running `"docker" "rm" "-f" "c5a1401316020b283c57ca175f9d1c0c374eba6bd2ef50b477ed0d7c4515ce72"`
[INFO] [stdout] c5a1401316020b283c57ca175f9d1c0c374eba6bd2ef50b477ed0d7c4515ce72
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin:/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] e82d947d53a55d8d5f144384c789d1e46abf8a70cd09d6960584d8cd5578f52b
[INFO] running `"docker" "start" "-a" "e82d947d53a55d8d5f144384c789d1e46abf8a70cd09d6960584d8cd5578f52b"`
[INFO] [stderr]    Compiling fin v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ast_gen.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let mut res = Resolver {
[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/code_gen.rs:83:17
[INFO] [stderr]    |
[INFO] [stderr] 83 |             let mut bb = self.def.add_block();
[INFO] [stderr]    |                 ----^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.09s
[INFO] running `"docker" "inspect" "e82d947d53a55d8d5f144384c789d1e46abf8a70cd09d6960584d8cd5578f52b"`
[INFO] running `"docker" "rm" "-f" "e82d947d53a55d8d5f144384c789d1e46abf8a70cd09d6960584d8cd5578f52b"`
[INFO] [stdout] e82d947d53a55d8d5f144384c789d1e46abf8a70cd09d6960584d8cd5578f52b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/danzhu/rust-fin:/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] cb31d2c2d38b8d97538e842c91efd4adec88f0d50a2e685d2b29f604aaa55c7b
[INFO] running `"docker" "start" "-a" "cb31d2c2d38b8d97538e842c91efd4adec88f0d50a2e685d2b29f604aaa55c7b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/fin-4e80fe6973cad7e0
[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" "cb31d2c2d38b8d97538e842c91efd4adec88f0d50a2e685d2b29f604aaa55c7b"`
[INFO] running `"docker" "rm" "-f" "cb31d2c2d38b8d97538e842c91efd4adec88f0d50a2e685d2b29f604aaa55c7b"`
[INFO] [stdout] cb31d2c2d38b8d97538e842c91efd4adec88f0d50a2e685d2b29f604aaa55c7b