[INFO] crate carnix 0.10.2 is already in cache
[INFO] extracting crate carnix 0.10.2 into work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/carnix/0.10.2
[INFO] extracting crate carnix 0.10.2 into work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/carnix/0.10.2
[INFO] validating manifest of carnix-0.10.2 on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of carnix-0.10.2 on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing carnix-0.10.2
[INFO] finished frobbing carnix-0.10.2
[INFO] frobbed toml for carnix-0.10.2 written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/carnix/0.10.2/Cargo.toml
[INFO] started frobbing carnix-0.10.2
[INFO] finished frobbing carnix-0.10.2
[INFO] frobbed toml for carnix-0.10.2 written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/carnix/0.10.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking carnix-0.10.2 against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-1/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/carnix/0.10.2:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 637c1936d593cc5e3e0ccd5b687de741b45c850515185ece26b6dd6aa79b823b
[INFO] running `"docker" "start" "-a" "637c1936d593cc5e3e0ccd5b687de741b45c850515185ece26b6dd6aa79b823b"`
[INFO] [stderr]     Checking carnix v0.10.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/cfg.rs:33:23
[INFO] [stderr]    |
[INFO] [stderr] 33 | 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:37:22
[INFO] [stderr]    |
[INFO] [stderr] 37 | 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:66:22
[INFO] [stderr]    |
[INFO] [stderr] 66 | 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:33:23
[INFO] [stderr]    |
[INFO] [stderr] 33 | 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:37:22
[INFO] [stderr]    |
[INFO] [stderr] 37 | 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:66:22
[INFO] [stderr]    |
[INFO] [stderr] 66 | 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:155:23
[INFO] [stderr]     |
[INFO] [stderr] 155 |         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:200:23
[INFO] [stderr]     |
[INFO] [stderr] 200 |         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:201:31
[INFO] [stderr]     |
[INFO] [stderr] 201 |             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:33:23
[INFO] [stderr]    |
[INFO] [stderr] 33 | 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:37:22
[INFO] [stderr]    |
[INFO] [stderr] 37 | 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:66:22
[INFO] [stderr]    |
[INFO] [stderr] 66 | 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:33:23
[INFO] [stderr]    |
[INFO] [stderr] 33 | 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:37:22
[INFO] [stderr]    |
[INFO] [stderr] 37 | 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:66:22
[INFO] [stderr]    |
[INFO] [stderr] 66 | 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:155:23
[INFO] [stderr]     |
[INFO] [stderr] 155 |         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:200:23
[INFO] [stderr]     |
[INFO] [stderr] 200 |         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:201:31
[INFO] [stderr]     |
[INFO] [stderr] 201 |             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: variable does not need to be mutable
[INFO] [stderr]    --> src/output.rs:409:21
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 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:466:28
[INFO] [stderr]     |
[INFO] [stderr] 466 |                         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:154:30
[INFO] [stderr]     |
[INFO] [stderr] 154 |     if let IResult::Done(ref i, ref o) = x {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/output.rs:827:21
[INFO] [stderr]     |
[INFO] [stderr] 827 |                 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:877:21
[INFO] [stderr]     |
[INFO] [stderr] 877 |                 let mut e = output_features
[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:888:29
[INFO] [stderr]     |
[INFO] [stderr] 888 |                         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:917:21
[INFO] [stderr]     |
[INFO] [stderr] 917 |                 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]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/cfg.rs:165:30
[INFO] [stderr]     |
[INFO] [stderr] 165 |     if let IResult::Done(ref i, ref o) = x {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |         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: unused variable: `i`
[INFO] [stderr]    --> src/cfg.rs:154:30
[INFO] [stderr]     |
[INFO] [stderr] 154 |     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: unused variable: `i`
[INFO] [stderr]    --> src/cfg.rs:165:30
[INFO] [stderr]     |
[INFO] [stderr] 165 |     if let IResult::Done(ref i, ref o) = x {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/output.rs:409:21
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 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:466:28
[INFO] [stderr]     |
[INFO] [stderr] 466 |                         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:827:21
[INFO] [stderr]     |
[INFO] [stderr] 827 |                 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:877:21
[INFO] [stderr]     |
[INFO] [stderr] 877 |                 let mut e = output_features
[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:888:29
[INFO] [stderr]     |
[INFO] [stderr] 888 |                         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:917:21
[INFO] [stderr]     |
[INFO] [stderr] 917 |                 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:409:21
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 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:466:28
[INFO] [stderr]     |
[INFO] [stderr] 466 |                         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/main.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |         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:827:21
[INFO] [stderr]     |
[INFO] [stderr] 827 |                 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:877:21
[INFO] [stderr]     |
[INFO] [stderr] 877 |                 let mut e = output_features
[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:888:29
[INFO] [stderr]     |
[INFO] [stderr] 888 |                         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:917:21
[INFO] [stderr]     |
[INFO] [stderr] 917 |                 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:409:21
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 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:466:28
[INFO] [stderr]     |
[INFO] [stderr] 466 |                         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:827:21
[INFO] [stderr]     |
[INFO] [stderr] 827 |                 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:877:21
[INFO] [stderr]     |
[INFO] [stderr] 877 |                 let mut e = output_features
[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:888:29
[INFO] [stderr]     |
[INFO] [stderr] 888 |                         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:917:21
[INFO] [stderr]     |
[INFO] [stderr] 917 |                 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 8.11s
[INFO] running `"docker" "inspect" "637c1936d593cc5e3e0ccd5b687de741b45c850515185ece26b6dd6aa79b823b"`
[INFO] running `"docker" "rm" "-f" "637c1936d593cc5e3e0ccd5b687de741b45c850515185ece26b6dd6aa79b823b"`
[INFO] [stdout] 637c1936d593cc5e3e0ccd5b687de741b45c850515185ece26b6dd6aa79b823b