[INFO] crate mpris 1.1.2 is already in cache
[INFO] extracting crate mpris 1.1.2 into work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/mpris/1.1.2
[INFO] extracting crate mpris 1.1.2 into work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/mpris/1.1.2
[INFO] validating manifest of mpris-1.1.2 on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mpris-1.1.2 on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mpris-1.1.2
[INFO] finished frobbing mpris-1.1.2
[INFO] frobbed toml for mpris-1.1.2 written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/mpris/1.1.2/Cargo.toml
[INFO] started frobbing mpris-1.1.2
[INFO] finished frobbing mpris-1.1.2
[INFO] frobbed toml for mpris-1.1.2 written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/mpris/1.1.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mpris-1.1.2 against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-3/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/mpris/1.1.2:/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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e212586818ab15406e7a43119c3357bae2a67cbaa1586d4d783d5502f88bd191
[INFO] running `"docker" "start" "-a" "e212586818ab15406e7a43119c3357bae2a67cbaa1586d4d783d5502f88bd191"`
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]    Compiling derive_is_enum_variant v0.1.1
[INFO] [stderr]    Compiling enum-kinds v0.4.1
[INFO] [stderr]    Compiling darling_core v0.4.0
[INFO] [stderr]    Compiling darling_macro v0.4.0
[INFO] [stderr]    Compiling darling v0.4.0
[INFO] [stderr]    Compiling from_variants_impl v0.3.0
[INFO] [stderr]     Checking from_variants v0.3.0
[INFO] [stderr]     Checking mpris v1.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:19:34
[INFO] [stderr]    |
[INFO] [stderr] 19 |     ) -> Result<arg::Variant<Box<arg::RefArg>>, Self::Err>;
[INFO] [stderr]    |                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[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/generated/mod.rs:23:70
[INFO] [stderr]    |
[INFO] [stderr] 23 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>;
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:28:33
[INFO] [stderr]    |
[INFO] [stderr] 28 |         value: arg::Variant<Box<arg::RefArg>>,
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |     ) -> Result<arg::Variant<Box<arg::RefArg>>, Self::Err> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:53:37
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let value: arg::Variant<Box<arg::RefArg>> = try!(i.read());
[INFO] [stderr]    |                                     ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:60:70
[INFO] [stderr]    |
[INFO] [stderr] 60 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:72:78
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let properties: ::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>> =
[INFO] [stderr]    |                                                                              ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:81:33
[INFO] [stderr]    |
[INFO] [stderr] 81 |         value: arg::Variant<Box<arg::RefArg>>,
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:101:82
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub changed_properties: ::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>,
[INFO] [stderr]     |                                                                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:109:35
[INFO] [stderr]     |
[INFO] [stderr] 109 |         (&self.interface_name as &arg::RefArg).append(i);
[INFO] [stderr]     |                                   ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:110:39
[INFO] [stderr]     |
[INFO] [stderr] 110 |         (&self.changed_properties as &arg::RefArg).append(i);
[INFO] [stderr]     |                                       ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:111:43
[INFO] [stderr]     |
[INFO] [stderr] 111 |         (&self.invalidated_properties as &arg::RefArg).append(i);
[INFO] [stderr]     |                                           ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:293:70
[INFO] [stderr]     |
[INFO] [stderr] 293 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>;
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:446:70
[INFO] [stderr]     |
[INFO] [stderr] 446 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:581:29
[INFO] [stderr]     |
[INFO] [stderr] 581 |         (&self.position as &arg::RefArg).append(i);
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/value.rs:73:54
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub(crate) fn from_variant(variant: &Variant<Box<RefArg>>) -> Option<Value> {
[INFO] [stderr]    |                                                      ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/mod.rs:31:39
[INFO] [stderr]    |
[INFO] [stderr] 31 |     rest: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]    |                                       ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/mod.rs:46:47
[INFO] [stderr]    |
[INFO] [stderr] 46 |         metadata: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]    |                                               ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:195:56
[INFO] [stderr]     |
[INFO] [stderr] 195 |     pub fn rest(&self) -> &HashMap<String, Variant<Box<RefArg>>> {
[INFO] [stderr]     |                                                        ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:256:39
[INFO] [stderr]     |
[INFO] [stderr] 256 |     rest: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]     |                                       ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:259:40
[INFO] [stderr]     |
[INFO] [stderr] 259 | fn cast_string_vec(value: &Variant<Box<RefArg>>) -> Option<Vec<String>> {
[INFO] [stderr]     |                                        ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:272:47
[INFO] [stderr]     |
[INFO] [stderr] 272 |         metadata: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]     |                                               ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:304:60
[INFO] [stderr]     |
[INFO] [stderr] 304 |     fn add_rest(&mut self, key: String, value: Variant<Box<RefArg>>) {
[INFO] [stderr]     |                                                            ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:19:34
[INFO] [stderr]    |
[INFO] [stderr] 19 |     ) -> Result<arg::Variant<Box<arg::RefArg>>, Self::Err>;
[INFO] [stderr]    |                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[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/generated/mod.rs:23:70
[INFO] [stderr]    |
[INFO] [stderr] 23 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>;
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:28:33
[INFO] [stderr]    |
[INFO] [stderr] 28 |         value: arg::Variant<Box<arg::RefArg>>,
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |     ) -> Result<arg::Variant<Box<arg::RefArg>>, Self::Err> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:53:37
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let value: arg::Variant<Box<arg::RefArg>> = try!(i.read());
[INFO] [stderr]    |                                     ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:60:70
[INFO] [stderr]    |
[INFO] [stderr] 60 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:72:78
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let properties: ::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>> =
[INFO] [stderr]    |                                                                              ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generated/mod.rs:81:33
[INFO] [stderr]    |
[INFO] [stderr] 81 |         value: arg::Variant<Box<arg::RefArg>>,
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:101:82
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub changed_properties: ::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>,
[INFO] [stderr]     |                                                                                  ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:109:35
[INFO] [stderr]     |
[INFO] [stderr] 109 |         (&self.interface_name as &arg::RefArg).append(i);
[INFO] [stderr]     |                                   ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:110:39
[INFO] [stderr]     |
[INFO] [stderr] 110 |         (&self.changed_properties as &arg::RefArg).append(i);
[INFO] [stderr]     |                                       ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:111:43
[INFO] [stderr]     |
[INFO] [stderr] 111 |         (&self.invalidated_properties as &arg::RefArg).append(i);
[INFO] [stderr]     |                                           ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:293:70
[INFO] [stderr]     |
[INFO] [stderr] 293 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>;
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:446:70
[INFO] [stderr]     |
[INFO] [stderr] 446 |     ) -> Result<::std::collections::HashMap<String, arg::Variant<Box<arg::RefArg>>>, Self::Err>
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generated/mod.rs:581:29
[INFO] [stderr]     |
[INFO] [stderr] 581 |         (&self.position as &arg::RefArg).append(i);
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: use `dyn`: `dyn arg::RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/value.rs:73:54
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub(crate) fn from_variant(variant: &Variant<Box<RefArg>>) -> Option<Value> {
[INFO] [stderr]    |                                                      ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/value.rs:285:36
[INFO] [stderr]     |
[INFO] [stderr] 285 |         let input: Vec<Variant<Box<RefArg>>> = vec![
[INFO] [stderr]     |                                    ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/value.rs:314:52
[INFO] [stderr]     |
[INFO] [stderr] 314 |         let mut input: HashMap<String, Variant<Box<RefArg>>> = HashMap::new();
[INFO] [stderr]     |                                                    ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/mod.rs:31:39
[INFO] [stderr]    |
[INFO] [stderr] 31 |     rest: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]    |                                       ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata/mod.rs:46:47
[INFO] [stderr]    |
[INFO] [stderr] 46 |         metadata: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]    |                                               ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:195:56
[INFO] [stderr]     |
[INFO] [stderr] 195 |     pub fn rest(&self) -> &HashMap<String, Variant<Box<RefArg>>> {
[INFO] [stderr]     |                                                        ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:256:39
[INFO] [stderr]     |
[INFO] [stderr] 256 |     rest: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]     |                                       ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:259:40
[INFO] [stderr]     |
[INFO] [stderr] 259 | fn cast_string_vec(value: &Variant<Box<RefArg>>) -> Option<Vec<String>> {
[INFO] [stderr]     |                                        ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:272:47
[INFO] [stderr]     |
[INFO] [stderr] 272 |         metadata: HashMap<String, Variant<Box<RefArg>>>,
[INFO] [stderr]     |                                               ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:304:60
[INFO] [stderr]     |
[INFO] [stderr] 304 |     fn add_rest(&mut self, key: String, value: Variant<Box<RefArg>>) {
[INFO] [stderr]     |                                                            ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata/mod.rs:351:61
[INFO] [stderr]     |
[INFO] [stderr] 351 |         fn metadata_with_rest<S>(key: S, value: Variant<Box<RefArg>>) -> Metadata
[INFO] [stderr]     |                                                             ^^^^^^ help: use `dyn`: `dyn RefArg`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.15s
[INFO] running `"docker" "inspect" "e212586818ab15406e7a43119c3357bae2a67cbaa1586d4d783d5502f88bd191"`
[INFO] running `"docker" "rm" "-f" "e212586818ab15406e7a43119c3357bae2a67cbaa1586d4d783d5502f88bd191"`
[INFO] [stdout] e212586818ab15406e7a43119c3357bae2a67cbaa1586d4d783d5502f88bd191