[INFO] crate im-rc 13.0.0 is already in cache
[INFO] checking im-rc-13.0.0 against master#fe6d05a8b32f5c66c427ca524dbcce5a7145f87e for pr-64327
[INFO] extracting crate im-rc 13.0.0 into work/builds/worker-0/source
[INFO] validating manifest of crates.io crate im-rc 13.0.0 on toolchain fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate im-rc 13.0.0
[INFO] finished tweaking crates.io crate im-rc 13.0.0
[INFO] tweaked toml for crates.io crate im-rc 13.0.0 written to work/builds/worker-0/source/Cargo.toml
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4e0e71f6f0bf8a25ca968e0b485f47eeceb2925b71d240712e6c53f7c97ea9ff
[INFO] running `"docker" "start" "-a" "4e0e71f6f0bf8a25ca968e0b485f47eeceb2925b71d240712e6c53f7c97ea9ff"`
[INFO] [stderr]    Compiling im-rc v13.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking sized-chunks v0.3.1
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]     Checking proptest v0.9.4
[INFO] [stderr]    Compiling bindgen v0.50.1
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:575:21
[INFO] [stderr]     |
[INFO] [stderr] 575 |                 let mut value;
[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/nodes/btree.rs:616:21
[INFO] [stderr]     |
[INFO] [stderr] 616 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:662:21
[INFO] [stderr]     |
[INFO] [stderr] 662 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:714:21
[INFO] [stderr]     |
[INFO] [stderr] 714 |                 let mut update;
[INFO] [stderr]     |                     ----^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:715:21
[INFO] [stderr]     |
[INFO] [stderr] 715 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:740:21
[INFO] [stderr]     |
[INFO] [stderr] 740 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]    Compiling onig_sys v69.2.0
[INFO] [stderr]     Checking onig v5.0.0
[INFO] [stderr]     Checking syntect v3.3.0
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:575:21
[INFO] [stderr]     |
[INFO] [stderr] 575 |                 let mut value;
[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/nodes/btree.rs:616:21
[INFO] [stderr]     |
[INFO] [stderr] 616 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:662:21
[INFO] [stderr]     |
[INFO] [stderr] 662 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:714:21
[INFO] [stderr]     |
[INFO] [stderr] 714 |                 let mut update;
[INFO] [stderr]     |                     ----^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:715:21
[INFO] [stderr]     |
[INFO] [stderr] 715 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nodes/btree.rs:740:21
[INFO] [stderr]     |
[INFO] [stderr] 740 |                 let mut out_value;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 01s
[INFO] running `"docker" "inspect" "4e0e71f6f0bf8a25ca968e0b485f47eeceb2925b71d240712e6c53f7c97ea9ff"`
[INFO] running `"docker" "rm" "-f" "4e0e71f6f0bf8a25ca968e0b485f47eeceb2925b71d240712e6c53f7c97ea9ff"`
[INFO] [stdout] 4e0e71f6f0bf8a25ca968e0b485f47eeceb2925b71d240712e6c53f7c97ea9ff