[INFO] cloning repository https://github.com/arcnmx/nixdrv-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arcnmx/nixdrv-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcnmx%2Fnixdrv-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcnmx%2Fnixdrv-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3da84c17afa00208eec7fe3846fd9ff0c8e1deee
[INFO] checking arcnmx/nixdrv-rs/3da84c17afa00208eec7fe3846fd9ff0c8e1deee against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcnmx%2Fnixdrv-rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arcnmx/nixdrv-rs 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 git repo https://github.com/arcnmx/nixdrv-rs
[INFO] finished tweaking git repo https://github.com/arcnmx/nixdrv-rs
[INFO] tweaked toml for git repo https://github.com/arcnmx/nixdrv-rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/arcnmx/nixdrv-rs already has a lockfile, it will not be regenerated
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded nom v6.2.1
[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] 5f7fd6d5e72b4c111aed62996e5ec5ff8ff581d3d1ad7274eb4c2ccb9b475896
[INFO] running `Command { std: "docker" "start" "-a" "5f7fd6d5e72b4c111aed62996e5ec5ff8ff581d3d1ad7274eb4c2ccb9b475896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5f7fd6d5e72b4c111aed62996e5ec5ff8ff581d3d1ad7274eb4c2ccb9b475896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f7fd6d5e72b4c111aed62996e5ec5ff8ff581d3d1ad7274eb4c2ccb9b475896", kill_on_drop: false }`
[INFO] [stdout] 5f7fd6d5e72b4c111aed62996e5ec5ff8ff581d3d1ad7274eb4c2ccb9b475896
[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] b558d0e24d4e29bb7281754d6025c46d66c03b86600635dd49d08333c45599dd
[INFO] running `Command { std: "docker" "start" "-a" "b558d0e24d4e29bb7281754d6025c46d66c03b86600635dd49d08333c45599dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling radium v0.5.3
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]     Checking funty v1.1.0
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling nom v6.2.1
[INFO] [stderr]     Checking bitvec v0.19.5
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking nixdrv v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/de.rs:50:16
[INFO] [stdout]    |
[INFO] [stdout] 50 |     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg`
[INFO] [stdout]   --> src/de.rs:58:29
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn custom<T: fmt::Display>(msg: T) -> Self {
[INFO] [stdout]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_msg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:66:44
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn deserialize_any<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:72:45
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn deserialize_bool<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:76:43
[INFO] [stdout]    |
[INFO] [stdout] 76 |     fn deserialize_i8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:80:44
[INFO] [stdout]    |
[INFO] [stdout] 80 |     fn deserialize_i16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:84:44
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn deserialize_i32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:88:44
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn deserialize_i64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:92:43
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn deserialize_u8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:96:44
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn deserialize_u16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:100:44
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn deserialize_u32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:104:44
[INFO] [stdout]     |
[INFO] [stdout] 104 |     fn deserialize_u64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/de.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     .map_err(|e| -> Self::Error { unimplemented!() })?
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:151:47
[INFO] [stdout]     |
[INFO] [stdout] 151 |     fn deserialize_option<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:155:45
[INFO] [stdout]     |
[INFO] [stdout] 155 |     fn deserialize_unit<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:199:44
[INFO] [stdout]     |
[INFO] [stdout] 199 |     fn deserialize_map<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/de.rs:306:42
[INFO] [stdout]     |
[INFO] [stdout] 306 |     fn tuple_variant<V: Visitor<'de>>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:306:54
[INFO] [stdout]     |
[INFO] [stdout] 306 |     fn tuple_variant<V: Visitor<'de>>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fields`
[INFO] [stdout]    --> src/de.rs:310:43
[INFO] [stdout]     |
[INFO] [stdout] 310 |     fn struct_variant<V: Visitor<'de>>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fields`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:310:76
[INFO] [stdout]     |
[INFO] [stdout] 310 |     fn struct_variant<V: Visitor<'de>>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/de.rs:50:16
[INFO] [stdout]    |
[INFO] [stdout] 50 |     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg`
[INFO] [stdout]   --> src/de.rs:58:29
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn custom<T: fmt::Display>(msg: T) -> Self {
[INFO] [stdout]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_msg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:66:44
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn deserialize_any<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:72:45
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn deserialize_bool<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:76:43
[INFO] [stdout]    |
[INFO] [stdout] 76 |     fn deserialize_i8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:80:44
[INFO] [stdout]    |
[INFO] [stdout] 80 |     fn deserialize_i16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:84:44
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn deserialize_i32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:88:44
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn deserialize_i64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:92:43
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn deserialize_u8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]   --> src/de.rs:96:44
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn deserialize_u16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]    |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:100:44
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn deserialize_u32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:104:44
[INFO] [stdout]     |
[INFO] [stdout] 104 |     fn deserialize_u64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/de.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     .map_err(|e| -> Self::Error { unimplemented!() })?
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:151:47
[INFO] [stdout]     |
[INFO] [stdout] 151 |     fn deserialize_option<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:155:45
[INFO] [stdout]     |
[INFO] [stdout] 155 |     fn deserialize_unit<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:199:44
[INFO] [stdout]     |
[INFO] [stdout] 199 |     fn deserialize_map<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]    --> src/de.rs:306:42
[INFO] [stdout]     |
[INFO] [stdout] 306 |     fn tuple_variant<V: Visitor<'de>>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:306:54
[INFO] [stdout]     |
[INFO] [stdout] 306 |     fn tuple_variant<V: Visitor<'de>>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fields`
[INFO] [stdout]    --> src/de.rs:310:43
[INFO] [stdout]     |
[INFO] [stdout] 310 |     fn struct_variant<V: Visitor<'de>>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fields`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visitor`
[INFO] [stdout]    --> src/de.rs:310:76
[INFO] [stdout]     |
[INFO] [stdout] 310 |     fn struct_variant<V: Visitor<'de>>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |                                                                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_visitor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `atom_complete` is never used
[INFO] [stdout]   --> src/lib.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn atom_complete(data: &[u8]) -> IResult<&[u8], Atom> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `atom_complete` is never used
[INFO] [stdout]   --> src/lib.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn atom_complete(data: &[u8]) -> IResult<&[u8], Atom> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Error`
[INFO] [stdout]  --> examples/parse.rs:1:31
[INFO] [stdout]   |
[INFO] [stdout] 1 | use nixdrv::{parse_drv_bytes, Error};
[INFO] [stdout]   |                               ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.83s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: nom v6.2.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "b558d0e24d4e29bb7281754d6025c46d66c03b86600635dd49d08333c45599dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b558d0e24d4e29bb7281754d6025c46d66c03b86600635dd49d08333c45599dd", kill_on_drop: false }`
[INFO] [stdout] b558d0e24d4e29bb7281754d6025c46d66c03b86600635dd49d08333c45599dd