[INFO] crate carnix 0.10.0 is already in cache
[INFO] extracting crate carnix 0.10.0 into work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/reg/carnix/0.10.0
[INFO] extracting crate carnix 0.10.0 into work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/carnix/0.10.0
[INFO] validating manifest of carnix-0.10.0 on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of carnix-0.10.0 on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing carnix-0.10.0
[INFO] finished frobbing carnix-0.10.0
[INFO] frobbed toml for carnix-0.10.0 written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/reg/carnix/0.10.0/Cargo.toml
[INFO] started frobbing carnix-0.10.0
[INFO] finished frobbing carnix-0.10.0
[INFO] frobbed toml for carnix-0.10.0 written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/carnix/0.10.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking carnix-0.10.0 against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-7/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/carnix/0.10.0:/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=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" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 831c77b7c761f91d298f15fb1a647ca99e08ab9d1b8abebda3e900d305339e92
[INFO] running `"docker" "start" "-a" "831c77b7c761f91d298f15fb1a647ca99e08ab9d1b8abebda3e900d305339e92"`
[INFO] [stderr]     Checking carnix v0.10.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:36:23
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn to_nix(w: &mut Write, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                       ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:41:22
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn to_nix_op(w: &mut Write, op: CfgOp, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:72:22
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn cfg_value(w: &mut Write, key: &str, value: &str) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:36:23
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn to_nix(w: &mut Write, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                       ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:41:22
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn to_nix_op(w: &mut Write, op: CfgOp, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:72:22
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn cfg_value(w: &mut Write, key: &str, value: &str) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:147:23
[INFO] [stderr]     |
[INFO] [stderr] 147 |         let file: Box<std::io::Read> = if let Some(f) = matches.value_of("file") {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:186:23
[INFO] [stderr]     |
[INFO] [stderr] 186 |         let file: Box<std::io::Read> = if let Some(v) = matches.values_of("file") {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:187:31
[INFO] [stderr]     |
[INFO] [stderr] 187 |             let mut file: Box<std::io::Read> = Box::new(std::io::empty());
[INFO] [stderr]     |                               ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:36:23
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn to_nix(w: &mut Write, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                       ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:41:22
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn to_nix_op(w: &mut Write, op: CfgOp, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:72:22
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn cfg_value(w: &mut Write, key: &str, value: &str) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:147:23
[INFO] [stderr]     |
[INFO] [stderr] 147 |         let file: Box<std::io::Read> = if let Some(f) = matches.value_of("file") {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:186:23
[INFO] [stderr]     |
[INFO] [stderr] 186 |         let file: Box<std::io::Read> = if let Some(v) = matches.values_of("file") {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:187:31
[INFO] [stderr]     |
[INFO] [stderr] 187 |             let mut file: Box<std::io::Read> = Box::new(std::io::empty());
[INFO] [stderr]     |                               ^^^^^^^^^^^^^ help: use `dyn`: `dyn std::io::Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:36:23
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn to_nix(w: &mut Write, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                       ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:41:22
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn to_nix_op(w: &mut Write, op: CfgOp, target: &[Cfg]) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:72:22
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn cfg_value(w: &mut Write, key: &str, value: &str) -> Result<(), Error> {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/cfg.rs:123:30
[INFO] [stderr]     |
[INFO] [stderr] 123 |     if let IResult::Done(ref i, ref o) = x {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let mut bindir = Path::new(path.trim()).join("bin");
[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:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let mut bindir = Path::new(path.trim()).join("bin");
[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/output.rs:385:21
[INFO] [stderr]     |
[INFO] [stderr] 385 |                 let mut pack = pack.as_table_mut().unwrap();
[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/output.rs:434:28
[INFO] [stderr]     |
[INFO] [stderr] 434 |                         Ok(mut prefetch) => Some(prefetch),
[INFO] [stderr]     |                            ----^^^^^^^^
[INFO] [stderr]     |                            |
[INFO] [stderr]     |                            help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/cfg.rs:123:30
[INFO] [stderr]     |
[INFO] [stderr] 123 |     if let IResult::Done(ref i, ref o) = x {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/output.rs:800:21
[INFO] [stderr]     |
[INFO] [stderr] 800 |                 let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:832:25
[INFO] [stderr]     |
[INFO] [stderr] 832 |                     let mut e = output_features.entry(format!("{}.\"{}\"", dep_name, feat)).or_insert(Vec::new());
[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/output.rs:844:33
[INFO] [stderr]     |
[INFO] [stderr] 844 |                             let mut e = output_features.entry(dep_name).or_insert(Vec::new());
[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/output.rs:872:17
[INFO] [stderr]     |
[INFO] [stderr] 872 |             let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:385:21
[INFO] [stderr]     |
[INFO] [stderr] 385 |                 let mut pack = pack.as_table_mut().unwrap();
[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/output.rs:434:28
[INFO] [stderr]     |
[INFO] [stderr] 434 |                         Ok(mut prefetch) => Some(prefetch),
[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/output.rs:800:21
[INFO] [stderr]     |
[INFO] [stderr] 800 |                 let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:832:25
[INFO] [stderr]     |
[INFO] [stderr] 832 |                     let mut e = output_features.entry(format!("{}.\"{}\"", dep_name, feat)).or_insert(Vec::new());
[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/output.rs:844:33
[INFO] [stderr]     |
[INFO] [stderr] 844 |                             let mut e = output_features.entry(dep_name).or_insert(Vec::new());
[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/output.rs:872:17
[INFO] [stderr]     |
[INFO] [stderr] 872 |             let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:385:21
[INFO] [stderr]     |
[INFO] [stderr] 385 |                 let mut pack = pack.as_table_mut().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/output.rs:434:28
[INFO] [stderr]     |
[INFO] [stderr] 434 |                         Ok(mut prefetch) => Some(prefetch),
[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/output.rs:800:21
[INFO] [stderr]     |
[INFO] [stderr] 800 |                 let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:832:25
[INFO] [stderr]     |
[INFO] [stderr] 832 |                     let mut e = output_features.entry(format!("{}.\"{}\"", dep_name, feat)).or_insert(Vec::new());
[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/output.rs:844:33
[INFO] [stderr]     |
[INFO] [stderr] 844 |                             let mut e = output_features.entry(dep_name).or_insert(Vec::new());
[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/output.rs:872:17
[INFO] [stderr]     |
[INFO] [stderr] 872 |             let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:385:21
[INFO] [stderr]     |
[INFO] [stderr] 385 |                 let mut pack = pack.as_table_mut().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/output.rs:434:28
[INFO] [stderr]     |
[INFO] [stderr] 434 |                         Ok(mut prefetch) => Some(prefetch),
[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/output.rs:800:21
[INFO] [stderr]     |
[INFO] [stderr] 800 |                 let mut e = output_features.entry(dep).or_insert(Vec::new());
[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/output.rs:832:25
[INFO] [stderr]     |
[INFO] [stderr] 832 |                     let mut e = output_features.entry(format!("{}.\"{}\"", dep_name, feat)).or_insert(Vec::new());
[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/output.rs:844:33
[INFO] [stderr]     |
[INFO] [stderr] 844 |                             let mut e = output_features.entry(dep_name).or_insert(Vec::new());
[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/output.rs:872:17
[INFO] [stderr]     |
[INFO] [stderr] 872 |             let mut e = output_features.entry(dep).or_insert(Vec::new());
[INFO] [stderr]     |                 ----^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.24s
[INFO] running `"docker" "inspect" "831c77b7c761f91d298f15fb1a647ca99e08ab9d1b8abebda3e900d305339e92"`
[INFO] running `"docker" "rm" "-f" "831c77b7c761f91d298f15fb1a647ca99e08ab9d1b8abebda3e900d305339e92"`
[INFO] [stdout] 831c77b7c761f91d298f15fb1a647ca99e08ab9d1b8abebda3e900d305339e92