[INFO] crate treez 0.12.0 is already in cache
[INFO] extracting crate treez 0.12.0 into work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/reg/treez/0.12.0
[INFO] extracting crate treez 0.12.0 into work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/reg/treez/0.12.0
[INFO] validating manifest of treez-0.12.0 on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of treez-0.12.0 on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing treez-0.12.0
[INFO] finished frobbing treez-0.12.0
[INFO] frobbed toml for treez-0.12.0 written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/reg/treez/0.12.0/Cargo.toml
[INFO] started frobbing treez-0.12.0
[INFO] finished frobbing treez-0.12.0
[INFO] frobbed toml for treez-0.12.0 written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/reg/treez/0.12.0/Cargo.toml
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking treez-0.12.0 against master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-1/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/reg/treez/0.12.0:/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" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 6139562f6e097dd6f2e708fe2f171d82a64b85acbd3974b2385dbbae33c2e6b0
[INFO] running `"docker" "start" "-a" "6139562f6e097dd6f2e708fe2f171d82a64b85acbd3974b2385dbbae33c2e6b0"`
[INFO] [stderr]     Checking mazth v0.0.0
[INFO] [stderr]     Checking treez v0.12.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/rb.rs:129:17
[INFO] [stderr]     |
[INFO] [stderr] 129 |             let mut leaf_dummy = Node {
[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/rb.rs:129:17
[INFO] [stderr]     |
[INFO] [stderr] 129 |             let mut leaf_dummy = Node {
[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]   --> tests/test_autograd.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut b = c.init_op( autograd::OpType::Add, & mut [ & mut z, & mut a ] );
[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]   --> tests/test_autograd.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let mut b = c.init_op( autograd::OpType::Add, & mut [ & mut z, & mut a ] );
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/test_autograd.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut b = c.init_op( autograd::OpType::Add, & mut [ & mut z, & mut a ] );
[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]   --> tests/test_autograd.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let mut b = c.init_op( autograd::OpType::Add, & mut [ & mut z, & mut a ] );
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.95s
[INFO] running `"docker" "inspect" "6139562f6e097dd6f2e708fe2f171d82a64b85acbd3974b2385dbbae33c2e6b0"`
[INFO] running `"docker" "rm" "-f" "6139562f6e097dd6f2e708fe2f171d82a64b85acbd3974b2385dbbae33c2e6b0"`
[INFO] [stdout] 6139562f6e097dd6f2e708fe2f171d82a64b85acbd3974b2385dbbae33c2e6b0