[INFO] fetching crate serde_transit 0.1.0...
[INFO] checking serde_transit-0.1.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate serde_transit 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate serde_transit 0.1.0 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_transit 0.1.0
[INFO] finished tweaking crates.io crate serde_transit 0.1.0
[INFO] tweaked toml for crates.io crate serde_transit 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 304926a7db5b70f2d81bf7106cc1542057585dbca97c7cdba9e8b0ef3583f456
[INFO] running `Command { std: "docker" "start" "-a" "304926a7db5b70f2d81bf7106cc1542057585dbca97c7cdba9e8b0ef3583f456", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "304926a7db5b70f2d81bf7106cc1542057585dbca97c7cdba9e8b0ef3583f456", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "304926a7db5b70f2d81bf7106cc1542057585dbca97c7cdba9e8b0ef3583f456", kill_on_drop: false }`
[INFO] [stdout] 304926a7db5b70f2d81bf7106cc1542057585dbca97c7cdba9e8b0ef3583f456
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c5dc0e42a75615e76f4955f8c74ed45334e15ee8dbf2d2cee9cfae6e0784e72e
[INFO] running `Command { std: "docker" "start" "-a" "c5dc0e42a75615e76f4955f8c74ed45334e15ee8dbf2d2cee9cfae6e0784e72e", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking serde_transit v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ser.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     try!(value.serialize(&mut ser));
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     try!(value.serialize(&mut ser));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ser.rs:281:41
[INFO] [stdout]     |
[INFO] [stdout] 281 |         Ok(Compound { encoder_compound: try!(self.encoder.serialize_struct(name, len)) })
[INFO] [stdout]     |                                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/de.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |             ch @ '0'...'9' => T::from(ch as u8 - b'0'),
[INFO] [stdout]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/de.rs:86:30
[INFO] [stdout]    |
[INFO] [stdout] 86 |                 Some(ch @ '0'...'9') => {
[INFO] [stdout]    |                              ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/de.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |             '0'...'9' => self.deserialize_u64(visitor),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/error.rs:74:43
[INFO] [stdout]    |
[INFO] [stdout] 74 |         formatter.write_str(error::Error::description(self))
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ser.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     try!(value.serialize(&mut ser));
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     try!(value.serialize(&mut ser));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ser.rs:281:41
[INFO] [stdout]     |
[INFO] [stdout] 281 |         Ok(Compound { encoder_compound: try!(self.encoder.serialize_struct(name, len)) })
[INFO] [stdout]     |                                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/de.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |             ch @ '0'...'9' => T::from(ch as u8 - b'0'),
[INFO] [stdout]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/de.rs:86:30
[INFO] [stdout]    |
[INFO] [stdout] 86 |                 Some(ch @ '0'...'9') => {
[INFO] [stdout]    |                              ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/de.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |             '0'...'9' => self.deserialize_u64(visitor),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/error.rs:74:43
[INFO] [stdout]    |
[INFO] [stdout] 74 |         formatter.write_str(error::Error::description(self))
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/error.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn from(e: json::Error) -> Error {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:234:28
[INFO] [stdout]     |
[INFO] [stdout] 234 |     fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:243:30
[INFO] [stdout]     |
[INFO] [stdout] 243 |     fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
[INFO] [stdout]     |                              ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:250:31
[INFO] [stdout]     |
[INFO] [stdout] 250 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:251:31
[INFO] [stdout]     |
[INFO] [stdout] 251 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:260:32
[INFO] [stdout]     |
[INFO] [stdout] 260 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant_index`
[INFO] [stdout]    --> src/ser.rs:261:32
[INFO] [stdout]     |
[INFO] [stdout] 261 | ...                   variant_index: u32,
[INFO] [stdout]     |                       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant`
[INFO] [stdout]    --> src/ser.rs:262:32
[INFO] [stdout]     |
[INFO] [stdout] 262 | ...                   variant: &'static str,
[INFO] [stdout]     |                       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:263:32
[INFO] [stdout]     |
[INFO] [stdout] 263 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:269:28
[INFO] [stdout]     |
[INFO] [stdout] 269 |     fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:287:33
[INFO] [stdout]     |
[INFO] [stdout] 287 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant_index`
[INFO] [stdout]    --> src/ser.rs:288:33
[INFO] [stdout]     |
[INFO] [stdout] 288 | ...                   variant_index: u32,
[INFO] [stdout]     |                       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant`
[INFO] [stdout]    --> src/ser.rs:289:33
[INFO] [stdout]     |
[INFO] [stdout] 289 | ...                   variant: &'static str,
[INFO] [stdout]     |                       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:290:33
[INFO] [stdout]     |
[INFO] [stdout] 290 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:314:40
[INFO] [stdout]     |
[INFO] [stdout] 314 |     fn serialize_element<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:331:40
[INFO] [stdout]     |
[INFO] [stdout] 331 |     fn serialize_element<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:347:38
[INFO] [stdout]     |
[INFO] [stdout] 347 |     fn serialize_field<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:371:38
[INFO] [stdout]     |
[INFO] [stdout] 371 |     fn serialize_field<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/ser.rs:402:36
[INFO] [stdout]     |
[INFO] [stdout] 402 |     fn serialize_key<T>(&mut self, key: &T) -> Result<()>
[INFO] [stdout]     |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:411:38
[INFO] [stdout]     |
[INFO] [stdout] 411 |     fn serialize_value<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/ser.rs:448:38
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:448:57
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
[INFO] [stdout]     |                                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_pretty_writer` is never used
[INFO] [stdout]   --> src/ser.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn to_pretty_writer<W, T: ?Sized>(writer: W, value: &T) -> Result<()>
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/error.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn from(e: json::Error) -> Error {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:234:28
[INFO] [stdout]     |
[INFO] [stdout] 234 |     fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:243:30
[INFO] [stdout]     |
[INFO] [stdout] 243 |     fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
[INFO] [stdout]     |                              ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:250:31
[INFO] [stdout]     |
[INFO] [stdout] 250 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:251:31
[INFO] [stdout]     |
[INFO] [stdout] 251 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:260:32
[INFO] [stdout]     |
[INFO] [stdout] 260 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant_index`
[INFO] [stdout]    --> src/ser.rs:261:32
[INFO] [stdout]     |
[INFO] [stdout] 261 | ...                   variant_index: u32,
[INFO] [stdout]     |                       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant`
[INFO] [stdout]    --> src/ser.rs:262:32
[INFO] [stdout]     |
[INFO] [stdout] 262 | ...                   variant: &'static str,
[INFO] [stdout]     |                       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:263:32
[INFO] [stdout]     |
[INFO] [stdout] 263 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:269:28
[INFO] [stdout]     |
[INFO] [stdout] 269 |     fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ser.rs:287:33
[INFO] [stdout]     |
[INFO] [stdout] 287 | ...                   name: &'static str,
[INFO] [stdout]     |                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant_index`
[INFO] [stdout]    --> src/ser.rs:288:33
[INFO] [stdout]     |
[INFO] [stdout] 288 | ...                   variant_index: u32,
[INFO] [stdout]     |                       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `variant`
[INFO] [stdout]    --> src/ser.rs:289:33
[INFO] [stdout]     |
[INFO] [stdout] 289 | ...                   variant: &'static str,
[INFO] [stdout]     |                       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/ser.rs:290:33
[INFO] [stdout]     |
[INFO] [stdout] 290 | ...                   len: usize)
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:314:40
[INFO] [stdout]     |
[INFO] [stdout] 314 |     fn serialize_element<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:331:40
[INFO] [stdout]     |
[INFO] [stdout] 331 |     fn serialize_element<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:347:38
[INFO] [stdout]     |
[INFO] [stdout] 347 |     fn serialize_field<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:371:38
[INFO] [stdout]     |
[INFO] [stdout] 371 |     fn serialize_field<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/ser.rs:402:36
[INFO] [stdout]     |
[INFO] [stdout] 402 |     fn serialize_key<T>(&mut self, key: &T) -> Result<()>
[INFO] [stdout]     |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:411:38
[INFO] [stdout]     |
[INFO] [stdout] 411 |     fn serialize_value<T>(&mut self, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/ser.rs:448:38
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
[INFO] [stdout]     |                                      ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ser.rs:448:57
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
[INFO] [stdout]     |                                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_pretty_writer` is never used
[INFO] [stdout]   --> src/ser.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn to_pretty_writer<W, T: ?Sized>(writer: W, value: &T) -> Result<()>
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/ser.rs:470:5
[INFO] [stdout]     |
[INFO] [stdout] 470 |     to_writer(&mut writer, &test);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 470 |     let _ = to_writer(&mut writer, &test);
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "c5dc0e42a75615e76f4955f8c74ed45334e15ee8dbf2d2cee9cfae6e0784e72e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5dc0e42a75615e76f4955f8c74ed45334e15ee8dbf2d2cee9cfae6e0784e72e", kill_on_drop: false }`
[INFO] [stdout] c5dc0e42a75615e76f4955f8c74ed45334e15ee8dbf2d2cee9cfae6e0784e72e