[INFO] crate mg-settings-macros 0.4.2 is already in cache
[INFO] extracting crate mg-settings-macros 0.4.2 into work/ex/clippy-test-run/sources/stable/reg/mg-settings-macros/0.4.2
[INFO] extracting crate mg-settings-macros 0.4.2 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/mg-settings-macros/0.4.2
[INFO] validating manifest of mg-settings-macros-0.4.2 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mg-settings-macros-0.4.2 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mg-settings-macros-0.4.2
[INFO] finished frobbing mg-settings-macros-0.4.2
[INFO] frobbed toml for mg-settings-macros-0.4.2 written to work/ex/clippy-test-run/sources/stable/reg/mg-settings-macros/0.4.2/Cargo.toml
[INFO] started frobbing mg-settings-macros-0.4.2
[INFO] finished frobbing mg-settings-macros-0.4.2
[INFO] frobbed toml for mg-settings-macros-0.4.2 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/mg-settings-macros/0.4.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting mg-settings-macros-0.4.2 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/mg-settings-macros/0.4.2:/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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4886d56e9750be4d19fd8fe6e797c531b34612dabc2cbb8b61989ca437a0a53e
[INFO] running `"docker" "start" "-a" "4886d56e9750be4d19fd8fe6e797c531b34612dabc2cbb8b61989ca437a0a53e"`
[INFO] [stderr]     Checking proc-macro2 v0.3.8
[INFO] [stderr]    Compiling mg-settings-macros v0.4.2
[INFO] [stderr]    Compiling mg-settings-macros v0.4.2 (/opt/crater/workdir)
[INFO] [stderr]     Checking quote v0.5.2
[INFO] [stderr]     Checking syn v0.13.11
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/lib.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     builder.try_init();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Checking mg-settings v0.4.3
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/attributes.rs:172:31
[INFO] [stderr]     |
[INFO] [stderr] 172 | pub fn to_metadata_impl(name: &Ident, body: &Data) -> (Tokens, Vec<VariantInfo>) {
[INFO] [stderr]     |                               ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: The function/method `to_metadata_impl` doesn't need a mutable reference
[INFO] [stderr]   --> src/commands.rs:32:65
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let (metadata_impl, variant_infos) = to_metadata_impl(name, &mut ast.data);
[INFO] [stderr]    |                                                                 ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unnecessary_mut_passed)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/attributes.rs:172:31
[INFO] [stderr]     |
[INFO] [stderr] 172 | pub fn to_metadata_impl(name: &Ident, body: &Data) -> (Tokens, Vec<VariantInfo>) {
[INFO] [stderr]     |                               ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/commands.rs:161:34
[INFO] [stderr]     |
[INFO] [stderr] 161 | fn to_special_command_impl(name: &Ident, variant_infos: &[VariantInfo]) -> Tokens {
[INFO] [stderr]     |                                  ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: The function/method `to_metadata_impl` doesn't need a mutable reference
[INFO] [stderr]   --> src/commands.rs:32:65
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let (metadata_impl, variant_infos) = to_metadata_impl(name, &mut ast.data);
[INFO] [stderr]    |                                                                 ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unnecessary_mut_passed)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:34:16
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let name = ast.ident.clone();
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `ast.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:40:32
[INFO] [stderr]    |
[INFO] [stderr] 40 |             variant_names.push(variant.ident.clone());
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `variant.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:45:44
[INFO] [stderr]    |
[INFO] [stderr] 45 |                             default = Some(variant.ident.clone());
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `variant.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:131:26
[INFO] [stderr]     |
[INFO] [stderr] 131 | fn is_custom_type(ident: &Ident) -> bool {
[INFO] [stderr]     |                          ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/commands.rs:161:34
[INFO] [stderr]     |
[INFO] [stderr] 161 | fn to_special_command_impl(name: &Ident, variant_infos: &[VariantInfo]) -> Tokens {
[INFO] [stderr]     |                                  ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:139:27
[INFO] [stderr]     |
[INFO] [stderr] 139 | fn to_enums(variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                           ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/settings.rs:140:5
[INFO] [stderr]     |
[INFO] [stderr] 140 | /     if let &Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = settings_struct {
[INFO] [stderr] 141 | |         let mut field_names = vec![];
[INFO] [stderr] 142 | |         let mut names = vec![];
[INFO] [stderr] 143 | |         let mut types = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 161 | |         panic!("Not a struct");
[INFO] [stderr] 162 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 140 |     if let Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = *settings_struct {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:166:27
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn to_settings_impl(name: &Ident, variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                           ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:166:49
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn to_settings_impl(name: &Ident, variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                                                 ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/settings.rs:167:5
[INFO] [stderr]     |
[INFO] [stderr] 167 | /     if let &Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = settings_struct {
[INFO] [stderr] 168 | |         let mut names = vec![];
[INFO] [stderr] 169 | |         let mut capitalized_names = vec![];
[INFO] [stderr] 170 | |         let mut original_types = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 261 | |         panic!("Not a struct");
[INFO] [stderr] 262 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 167 |     if let Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = *settings_struct {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:34:16
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let name = ast.ident.clone();
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `ast.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:40:32
[INFO] [stderr]    |
[INFO] [stderr] 40 |             variant_names.push(variant.ident.clone());
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `variant.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/settings.rs:45:44
[INFO] [stderr]    |
[INFO] [stderr] 45 |                             default = Some(variant.ident.clone());
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `variant.ident`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:266:39
[INFO] [stderr]     |
[INFO] [stderr] 266 | pub fn to_setting_completion_fn(name: &Ident, body: &Data) -> Tokens {
[INFO] [stderr]     |                                       ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:131:26
[INFO] [stderr]     |
[INFO] [stderr] 131 | fn is_custom_type(ident: &Ident) -> bool {
[INFO] [stderr]     |                          ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:139:27
[INFO] [stderr]     |
[INFO] [stderr] 139 | fn to_enums(variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                           ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:306:25
[INFO] [stderr]     |
[INFO] [stderr] 306 | fn to_value_type(ident: &Ident) -> Ident {
[INFO] [stderr]     |                         ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/settings.rs:140:5
[INFO] [stderr]     |
[INFO] [stderr] 140 | /     if let &Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = settings_struct {
[INFO] [stderr] 141 | |         let mut field_names = vec![];
[INFO] [stderr] 142 | |         let mut names = vec![];
[INFO] [stderr] 143 | |         let mut types = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 161 | |         panic!("Not a struct");
[INFO] [stderr] 162 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 140 |     if let Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = *settings_struct {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/lib.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     builder.try_init();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:166:27
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn to_settings_impl(name: &Ident, variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                           ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:166:49
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn to_settings_impl(name: &Ident, variant_name: &Ident, settings_struct: &Data) -> Tokens {
[INFO] [stderr]     |                                                 ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/settings.rs:167:5
[INFO] [stderr]     |
[INFO] [stderr] 167 | /     if let &Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = settings_struct {
[INFO] [stderr] 168 | |         let mut names = vec![];
[INFO] [stderr] 169 | |         let mut capitalized_names = vec![];
[INFO] [stderr] 170 | |         let mut original_types = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 261 | |         panic!("Not a struct");
[INFO] [stderr] 262 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 167 |     if let Struct(DataStruct { fields: Fields::Named(ref fields), .. }) = *settings_struct {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:266:39
[INFO] [stderr]     |
[INFO] [stderr] 266 | pub fn to_setting_completion_fn(name: &Ident, body: &Data) -> Tokens {
[INFO] [stderr]     |                                       ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/settings.rs:306:25
[INFO] [stderr]     |
[INFO] [stderr] 306 | fn to_value_type(ident: &Ident) -> Ident {
[INFO] [stderr]     |                         ^^^^^^ help: consider passing by value instead: `Ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/lib.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     builder.try_init();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.16s
[INFO] running `"docker" "inspect" "4886d56e9750be4d19fd8fe6e797c531b34612dabc2cbb8b61989ca437a0a53e"`
[INFO] running `"docker" "rm" "-f" "4886d56e9750be4d19fd8fe6e797c531b34612dabc2cbb8b61989ca437a0a53e"`
[INFO] [stdout] 4886d56e9750be4d19fd8fe6e797c531b34612dabc2cbb8b61989ca437a0a53e