[INFO] updating cached repository bouncenow/rlox
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bouncenow/rlox
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bouncenow/rlox" "work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/bouncenow/rlox"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/bouncenow/rlox'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bouncenow/rlox" "work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/bouncenow/rlox"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/bouncenow/rlox'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 263e1b2bbc960ec8014a508d7acd6b73f883a44c
[INFO] sha for GitHub repo bouncenow/rlox: 263e1b2bbc960ec8014a508d7acd6b73f883a44c
[INFO] validating manifest of bouncenow/rlox on toolchain master#39401465da4ce27aeeb2c2a26133ac35c63aa515
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bouncenow/rlox on toolchain try#f45cc3094ee337acd688771b9234318046b0572d
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bouncenow/rlox
[INFO] finished frobbing bouncenow/rlox
[INFO] frobbed toml for bouncenow/rlox written to work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/bouncenow/rlox/Cargo.toml
[INFO] started frobbing bouncenow/rlox
[INFO] finished frobbing bouncenow/rlox
[INFO] frobbed toml for bouncenow/rlox written to work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/bouncenow/rlox/Cargo.toml
[INFO] crate bouncenow/rlox already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking bouncenow/rlox against master#39401465da4ce27aeeb2c2a26133ac35c63aa515 for pr-60914
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60914/worker-1/master#39401465da4ce27aeeb2c2a26133ac35c63aa515:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/bouncenow/rlox:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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=forbid" "-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" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 30dc34a7854491db99cbc2e89396199fcd87d27dbbeeb318a038840a80f8382e
[INFO] running `"docker" "start" "-a" "30dc34a7854491db99cbc2e89396199fcd87d27dbbeeb318a038840a80f8382e"`
[INFO] [stderr]     Checking rlox v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/interpreter.rs:230:25
[INFO] [stderr]     |
[INFO] [stderr] 230 |                     let mut env_with_super = RefCell::new(Environment::new_with_enclosing(Rc::clone(&self.current_env)));
[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/interpreter.rs:230:25
[INFO] [stderr]     |
[INFO] [stderr] 230 |                     let mut env_with_super = RefCell::new(Environment::new_with_enclosing(Rc::clone(&self.current_env)));
[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/main.rs:99:17
[INFO] [stderr]    |
[INFO] [stderr] 99 |             let mut parse_as_statements_res = parse::parse(&tokens);
[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/main.rs:99:17
[INFO] [stderr]    |
[INFO] [stderr] 99 |             let mut parse_as_statements_res = parse::parse(&tokens);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.55s
[INFO] running `"docker" "inspect" "30dc34a7854491db99cbc2e89396199fcd87d27dbbeeb318a038840a80f8382e"`
[INFO] running `"docker" "rm" "-f" "30dc34a7854491db99cbc2e89396199fcd87d27dbbeeb318a038840a80f8382e"`
[INFO] [stdout] 30dc34a7854491db99cbc2e89396199fcd87d27dbbeeb318a038840a80f8382e