[INFO] cloning repository https://github.com/Pyrlang/Term
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Pyrlang/Term" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPyrlang%2FTerm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPyrlang%2FTerm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fe6dd0793edf438da4a05c0fd4fca4c10f5ba0f0
[INFO] testing Pyrlang/Term against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPyrlang%2FTerm" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Pyrlang/Term on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Pyrlang/Term
[INFO] finished tweaking git repo https://github.com/Pyrlang/Term
[INFO] tweaked toml for git repo https://github.com/Pyrlang/Term written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/Pyrlang/Term already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded empty v0.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad786fb5ef4e156209c7e61b12b7c01e5e995612fc9fe80a0ea823e99422606d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "ad786fb5ef4e156209c7e61b12b7c01e5e995612fc9fe80a0ea823e99422606d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad786fb5ef4e156209c7e61b12b7c01e5e995612fc9fe80a0ea823e99422606d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad786fb5ef4e156209c7e61b12b7c01e5e995612fc9fe80a0ea823e99422606d", kill_on_drop: false }`
[INFO] [stdout] ad786fb5ef4e156209c7e61b12b7c01e5e995612fc9fe80a0ea823e99422606d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 15026f7b331e5a57ba68a7c07676c27bc1b2a3021f2e34749ab06dbbf6f10d18
[INFO] running `Command { std: "docker" "start" "-a" "15026f7b331e5a57ba68a7c07676c27bc1b2a3021f2e34749ab06dbbf6f10d18", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.43
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]    Compiling ucd-util v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling utf8-ranges v1.0.1
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling cc v1.0.25
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling cfg-if v0.1.5
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]    Compiling cpython v0.2.1
[INFO] [stderr]    Compiling rustc-demangle v0.1.9
[INFO] [stderr]    Compiling byteorder v0.4.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling byteorder v1.2.6
[INFO] [stderr]    Compiling byte v0.2.3
[INFO] [stderr]    Compiling log v0.4.5
[INFO] [stderr]    Compiling regex-syntax v0.6.6
[INFO] [stderr]    Compiling empty v0.0.4
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling aho-corasick v0.7.3
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling backtrace v0.3.9
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling compress v0.1.2
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling python3-sys v0.2.1
[INFO] [stderr]    Compiling failure v0.1.2
[INFO] [stderr]    Compiling native_codec_impl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/lib.rs:96:11
[INFO] [stdout]    |
[INFO] [stdout] 96 |   |py, m| { m_init(py, m) }
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]    --> src/decoder.rs:629:9
[INFO] [stdout]     |
[INFO] [stdout] 629 |     let size = in_bytes.read_with::<u32>(offset, byte::BE)?;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]    --> src/encoder.rs:131:7
[INFO] [stdout]     |
[INFO] [stdout] 131 |       other => return self.write_unknown_object(type_name_ref, &term)
[INFO] [stdout]     |       ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/encoder.rs:140:38
[INFO] [stdout]     |
[INFO] [stdout] 140 |   fn write_unknown_object(&mut self, name: &str, py_term: &PyObject) -> CodecResult<()> {
[INFO] [stdout]     |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/decoder.rs:490:9
[INFO] [stdout]     |
[INFO] [stdout] 490 |     let mut result = PyDict::new(self.py);
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/decoder.rs:498:7
[INFO] [stdout]     |
[INFO] [stdout] 498 |       result.set_item(self.py, py_key, py_val);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/encoder.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         self.write_list_no_tail(&as_list);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/encoder.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         self.write_tuple(&as_tup);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         self.write_dict(&as_dict);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         self.write_list_no_tail(&elements);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:183:7
[INFO] [stdout]     |
[INFO] [stdout] 183 |       self.encode(&item);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |       self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:202:7
[INFO] [stdout]     |
[INFO] [stdout] 202 |       self.encode(&item);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:213:5
[INFO] [stdout]     |
[INFO] [stdout] 213 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:216:7
[INFO] [stdout]     |
[INFO] [stdout] 216 |       self.encode(&py_key);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:217:7
[INFO] [stdout]     |
[INFO] [stdout] 217 |       self.encode(&py_value);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:241:7
[INFO] [stdout]     |
[INFO] [stdout] 241 |       self.data.write_u32::<BigEndian>(size);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:252:7
[INFO] [stdout]     |
[INFO] [stdout] 252 |       self.data.write(data);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:257:7
[INFO] [stdout]     |
[INFO] [stdout] 257 |       self.data.write(data);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:270:7
[INFO] [stdout]     |
[INFO] [stdout] 270 |       self.data.write_i32::<BigEndian>(val as i32);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:282:5
[INFO] [stdout]     |
[INFO] [stdout] 282 |     self.data.write_f64::<BigEndian>(val);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:304:7
[INFO] [stdout]     |
[INFO] [stdout] 304 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:307:7
[INFO] [stdout]     |
[INFO] [stdout] 307 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:308:7
[INFO] [stdout]     |
[INFO] [stdout] 308 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:328:7
[INFO] [stdout]     |
[INFO] [stdout] 328 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:329:7
[INFO] [stdout]     |
[INFO] [stdout] 329 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:334:7
[INFO] [stdout]     |
[INFO] [stdout] 334 |       self.data.write_u32::<BigEndian>(chars_count as u32); // chars, not bytes!
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:362:5
[INFO] [stdout]     |
[INFO] [stdout] 362 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:363:5
[INFO] [stdout]     |
[INFO] [stdout] 363 |     self.data.write_u32::<BigEndian>(id);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:364:5
[INFO] [stdout]     |
[INFO] [stdout] 364 |     self.data.write_u32::<BigEndian>(serial);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:365:5
[INFO] [stdout]     |
[INFO] [stdout] 365 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     self.data.write_u16::<BigEndian>((id.len() / 4) as u16);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:388:5
[INFO] [stdout]     |
[INFO] [stdout] 388 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:389:5
[INFO] [stdout]     |
[INFO] [stdout] 389 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:390:5
[INFO] [stdout]     |
[INFO] [stdout] 390 |     self.data.write(id);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:401:5
[INFO] [stdout]     |
[INFO] [stdout] 401 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:402:5
[INFO] [stdout]     |
[INFO] [stdout] 402 |     self.data.write(data);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:419:5
[INFO] [stdout]     |
[INFO] [stdout] 419 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:421:5
[INFO] [stdout]     |
[INFO] [stdout] 421 |     self.data.write(data);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.48s
[INFO] running `Command { std: "docker" "inspect" "15026f7b331e5a57ba68a7c07676c27bc1b2a3021f2e34749ab06dbbf6f10d18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15026f7b331e5a57ba68a7c07676c27bc1b2a3021f2e34749ab06dbbf6f10d18", kill_on_drop: false }`
[INFO] [stdout] 15026f7b331e5a57ba68a7c07676c27bc1b2a3021f2e34749ab06dbbf6f10d18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5de3d7a163a7ad62fdb6f15656288c2c2e166a6aa20f40782c2913fb7283c2eb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "5de3d7a163a7ad62fdb6f15656288c2c2e166a6aa20f40782c2913fb7283c2eb", kill_on_drop: false }`
[INFO] [stderr]    Compiling native_codec_impl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/lib.rs:96:11
[INFO] [stdout]    |
[INFO] [stdout] 96 |   |py, m| { m_init(py, m) }
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]    --> src/decoder.rs:629:9
[INFO] [stdout]     |
[INFO] [stdout] 629 |     let size = in_bytes.read_with::<u32>(offset, byte::BE)?;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]    --> src/encoder.rs:131:7
[INFO] [stdout]     |
[INFO] [stdout] 131 |       other => return self.write_unknown_object(type_name_ref, &term)
[INFO] [stdout]     |       ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/encoder.rs:140:38
[INFO] [stdout]     |
[INFO] [stdout] 140 |   fn write_unknown_object(&mut self, name: &str, py_term: &PyObject) -> CodecResult<()> {
[INFO] [stdout]     |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/decoder.rs:490:9
[INFO] [stdout]     |
[INFO] [stdout] 490 |     let mut result = PyDict::new(self.py);
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/decoder.rs:498:7
[INFO] [stdout]     |
[INFO] [stdout] 498 |       result.set_item(self.py, py_key, py_val);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/encoder.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         self.write_list_no_tail(&as_list);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/encoder.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         self.write_tuple(&as_tup);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         self.write_dict(&as_dict);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         self.write_list_no_tail(&elements);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:183:7
[INFO] [stdout]     |
[INFO] [stdout] 183 |       self.encode(&item);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |       self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:202:7
[INFO] [stdout]     |
[INFO] [stdout] 202 |       self.encode(&item);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:213:5
[INFO] [stdout]     |
[INFO] [stdout] 213 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:216:7
[INFO] [stdout]     |
[INFO] [stdout] 216 |       self.encode(&py_key);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:217:7
[INFO] [stdout]     |
[INFO] [stdout] 217 |       self.encode(&py_value);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:241:7
[INFO] [stdout]     |
[INFO] [stdout] 241 |       self.data.write_u32::<BigEndian>(size);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:252:7
[INFO] [stdout]     |
[INFO] [stdout] 252 |       self.data.write(data);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:257:7
[INFO] [stdout]     |
[INFO] [stdout] 257 |       self.data.write(data);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:270:7
[INFO] [stdout]     |
[INFO] [stdout] 270 |       self.data.write_i32::<BigEndian>(val as i32);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:282:5
[INFO] [stdout]     |
[INFO] [stdout] 282 |     self.data.write_f64::<BigEndian>(val);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:304:7
[INFO] [stdout]     |
[INFO] [stdout] 304 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:307:7
[INFO] [stdout]     |
[INFO] [stdout] 307 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:308:7
[INFO] [stdout]     |
[INFO] [stdout] 308 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:328:7
[INFO] [stdout]     |
[INFO] [stdout] 328 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:329:7
[INFO] [stdout]     |
[INFO] [stdout] 329 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:334:7
[INFO] [stdout]     |
[INFO] [stdout] 334 |       self.data.write_u32::<BigEndian>(chars_count as u32); // chars, not bytes!
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:362:5
[INFO] [stdout]     |
[INFO] [stdout] 362 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:363:5
[INFO] [stdout]     |
[INFO] [stdout] 363 |     self.data.write_u32::<BigEndian>(id);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:364:5
[INFO] [stdout]     |
[INFO] [stdout] 364 |     self.data.write_u32::<BigEndian>(serial);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:365:5
[INFO] [stdout]     |
[INFO] [stdout] 365 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     self.data.write_u16::<BigEndian>((id.len() / 4) as u16);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:388:5
[INFO] [stdout]     |
[INFO] [stdout] 388 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:389:5
[INFO] [stdout]     |
[INFO] [stdout] 389 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:390:5
[INFO] [stdout]     |
[INFO] [stdout] 390 |     self.data.write(id);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:401:5
[INFO] [stdout]     |
[INFO] [stdout] 401 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:402:5
[INFO] [stdout]     |
[INFO] [stdout] 402 |     self.data.write(data);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:419:5
[INFO] [stdout]     |
[INFO] [stdout] 419 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/encoder.rs:421:5
[INFO] [stdout]     |
[INFO] [stdout] 421 |     self.data.write(data);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.50s
[INFO] running `Command { std: "docker" "inspect" "5de3d7a163a7ad62fdb6f15656288c2c2e166a6aa20f40782c2913fb7283c2eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5de3d7a163a7ad62fdb6f15656288c2c2e166a6aa20f40782c2913fb7283c2eb", kill_on_drop: false }`
[INFO] [stdout] 5de3d7a163a7ad62fdb6f15656288c2c2e166a6aa20f40782c2913fb7283c2eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 5f94b5f06ac46d5932c0d1ce1f69c4d2d30507bd0af32c66d13b2ab7566ea3e3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "5f94b5f06ac46d5932c0d1ce1f69c4d2d30507bd0af32c66d13b2ab7566ea3e3", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | py_exception!(native_codec_impl, PyCodecError);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]   --> src/lib.rs:96:11
[INFO] [stderr]    |
[INFO] [stderr] 96 |   |py, m| { m_init(py, m) }
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]    --> src/decoder.rs:629:9
[INFO] [stderr]     |
[INFO] [stderr] 629 |     let size = in_bytes.read_with::<u32>(offset, byte::BE)?;
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/encoder.rs:131:7
[INFO] [stderr]     |
[INFO] [stderr] 131 |       other => return self.write_unknown_object(type_name_ref, &term)
[INFO] [stderr]     |       ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]    --> src/encoder.rs:140:38
[INFO] [stderr]     |
[INFO] [stderr] 140 |   fn write_unknown_object(&mut self, name: &str, py_term: &PyObject) -> CodecResult<()> {
[INFO] [stderr]     |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/decoder.rs:490:9
[INFO] [stderr]     |
[INFO] [stderr] 490 |     let mut result = PyDict::new(self.py);
[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 `std::result::Result` that must be used
[INFO] [stderr]    --> src/decoder.rs:498:7
[INFO] [stderr]     |
[INFO] [stderr] 498 |       result.set_item(self.py, py_key, py_val);
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/encoder.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         self.write_list_no_tail(&as_list);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/encoder.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         self.write_tuple(&as_tup);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         self.write_dict(&as_dict);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 |         self.write_list_no_tail(&elements);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:179:5
[INFO] [stderr]     |
[INFO] [stderr] 179 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:183:7
[INFO] [stderr]     |
[INFO] [stderr] 183 |       self.encode(&item);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:197:7
[INFO] [stderr]     |
[INFO] [stderr] 197 |       self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stdout] running 0 tests
[INFO] [stderr]    --> src/encoder.rs:202:7
[INFO] [stdout] 
[INFO] [stderr]     |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stderr] 202 |       self.encode(&item);
[INFO] [stdout] 
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:213:5
[INFO] [stderr]     |
[INFO] [stderr] 213 |     self.data.write_u32::<BigEndian>(size as u32);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:216:7
[INFO] [stderr]     |
[INFO] [stderr] 216 |       self.encode(&py_key);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:217:7
[INFO] [stderr]     |
[INFO] [stderr] 217 |       self.encode(&py_value);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:241:7
[INFO] [stderr]     |
[INFO] [stderr] 241 |       self.data.write_u32::<BigEndian>(size);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:252:7
[INFO] [stderr]     |
[INFO] [stderr] 252 |       self.data.write(data);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:257:7
[INFO] [stderr]     |
[INFO] [stderr] 257 |       self.data.write(data);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:270:7
[INFO] [stderr]     |
[INFO] [stderr] 270 |       self.data.write_i32::<BigEndian>(val as i32);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     self.data.write_f64::<BigEndian>(val);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:304:7
[INFO] [stderr]     |
[INFO] [stderr] 304 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:307:7
[INFO] [stderr]     |
[INFO] [stderr] 307 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:308:7
[INFO] [stderr]     |
[INFO] [stderr] 308 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:328:7
[INFO] [stderr]     |
[INFO] [stderr] 328 |       self.data.write_u16::<BigEndian>(str_byte_length as u16); // 16bit length
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:329:7
[INFO] [stderr]     |
[INFO] [stderr] 329 |       self.data.write(byte_array); // write &[u8] string content
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:334:7
[INFO] [stderr]     |
[INFO] [stderr] 334 |       self.data.write_u32::<BigEndian>(chars_count as u32); // chars, not bytes!
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:362:5
[INFO] [stderr]     |
[INFO] [stderr] 362 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:363:5
[INFO] [stderr]     |
[INFO] [stderr] 363 |     self.data.write_u32::<BigEndian>(id);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:364:5
[INFO] [stderr]     |
[INFO] [stderr] 364 |     self.data.write_u32::<BigEndian>(serial);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:365:5
[INFO] [stderr]     |
[INFO] [stderr] 365 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:387:5
[INFO] [stderr]     |
[INFO] [stderr] 387 |     self.data.write_u16::<BigEndian>((id.len() / 4) as u16);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:388:5
[INFO] [stderr]     |
[INFO] [stderr] 388 |     self.write_atom_from_cow(node_name.to_string(self.py)?);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:389:5
[INFO] [stderr]     |
[INFO] [stderr] 389 |     self.data.write_u32::<BigEndian>(creation);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:390:5
[INFO] [stderr]     |
[INFO] [stderr] 390 |     self.data.write(id);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:401:5
[INFO] [stderr]     |
[INFO] [stderr] 401 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:402:5
[INFO] [stderr]     |
[INFO] [stderr] 402 |     self.data.write(data);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:419:5
[INFO] [stderr]     |
[INFO] [stderr] 419 |     self.data.write_u32::<BigEndian>(data.len() as u32);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/encoder.rs:421:5
[INFO] [stderr]     |
[INFO] [stderr] 421 |     self.data.write(data);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 42 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/native_codec_impl-d74913fbd4c68532
[INFO] running `Command { std: "docker" "inspect" "5f94b5f06ac46d5932c0d1ce1f69c4d2d30507bd0af32c66d13b2ab7566ea3e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f94b5f06ac46d5932c0d1ce1f69c4d2d30507bd0af32c66d13b2ab7566ea3e3", kill_on_drop: false }`
[INFO] [stdout] 5f94b5f06ac46d5932c0d1ce1f69c4d2d30507bd0af32c66d13b2ab7566ea3e3