[INFO] cloning repository https://github.com/TopologicallySpeaking/ckproof
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TopologicallySpeaking/ckproof" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTopologicallySpeaking%2Fckproof", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTopologicallySpeaking%2Fckproof'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 78d4e9f21921e686914c1eeb9f4f1200cb1f0c11
[INFO] checking TopologicallySpeaking/ckproof against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTopologicallySpeaking%2Fckproof" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TopologicallySpeaking/ckproof on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TopologicallySpeaking/ckproof
[INFO] finished tweaking git repo https://github.com/TopologicallySpeaking/ckproof
[INFO] tweaked toml for git repo https://github.com/TopologicallySpeaking/ckproof written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/TopologicallySpeaking/ckproof already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--no-deps" "--format-version=1", 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] 909608a28b76b6b0f56191a9c352f21c4d9b7dd7b4d44201421b85deedb6d1f5
[INFO] running `Command { std: "docker" "start" "-a" "909608a28b76b6b0f56191a9c352f21c4d9b7dd7b4d44201421b85deedb6d1f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "909608a28b76b6b0f56191a9c352f21c4d9b7dd7b4d44201421b85deedb6d1f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "909608a28b76b6b0f56191a9c352f21c4d9b7dd7b4d44201421b85deedb6d1f5", kill_on_drop: false }`
[INFO] [stdout] 909608a28b76b6b0f56191a9c352f21c4d9b7dd7b4d44201421b85deedb6d1f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ddd99a67eaf5dbb702b23b9b61d7180b16274f1a488916d8696855f1d21c91f
[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" "6ddd99a67eaf5dbb702b23b9b61d7180b16274f1a488916d8696855f1d21c91f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking tinyvec v1.1.0
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking form_urlencoded v1.0.0
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking unicode-normalization v0.1.16
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking url v2.2.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking ckproof v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/document/language.rs:191:18
[INFO] [stdout]     |
[INFO] [stdout] 191 |                 .intersperse(", ".to_owned())
[INFO] [stdout]     |                  ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `itertools::Itertools::intersperse(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(iter_intersperse)]` to the crate attributes to enable `std::iter::Iterator::intersperse`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/document/language.rs:191:18
[INFO] [stdout]     |
[INFO] [stdout] 191 |                 .intersperse(", ".to_owned())
[INFO] [stdout]     |                  ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `itertools::Itertools::intersperse(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(iter_intersperse)]` to the crate attributes to enable `std::iter::Iterator::intersperse`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]     --> src/builders/language.rs:1049:47
[INFO] [stdout]      |
[INFO] [stdout] 1049 |     fn build(&self, local_index: &LocalIndex, errors: &mut ParsingErrorContext) {
[INFO] [stdout]      |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1267:26
[INFO] [stdout]      |
[INFO] [stdout] 1267 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1277:26
[INFO] [stdout]      |
[INFO] [stdout] 1277 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1291:26
[INFO] [stdout]      |
[INFO] [stdout] 1291 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:294:32
[INFO] [stdout]     |
[INFO] [stdout] 294 |     fn verify_structure(&self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:677:62
[INFO] [stdout]     |
[INFO] [stdout] 677 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:713:62
[INFO] [stdout]     |
[INFO] [stdout] 713 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:746:49
[INFO] [stdout]     |
[INFO] [stdout] 746 |     fn verify_structure(&self, tags: &TagIndex, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:897:33
[INFO] [stdout]     |
[INFO] [stdout] 897 |     fn unicorn_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:905:31
[INFO] [stdout]     |
[INFO] [stdout] 905 |     fn unicorn_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:913:28
[INFO] [stdout]     |
[INFO] [stdout] 913 |     fn em_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:921:26
[INFO] [stdout]     |
[INFO] [stdout] 921 |     fn em_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]     --> src/builders/language.rs:1049:47
[INFO] [stdout]      |
[INFO] [stdout] 1049 |     fn build(&self, local_index: &LocalIndex, errors: &mut ParsingErrorContext) {
[INFO] [stdout]      |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1267:26
[INFO] [stdout]      |
[INFO] [stdout] 1267 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1277:26
[INFO] [stdout]      |
[INFO] [stdout] 1277 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `builder`
[INFO] [stdout]     --> src/builders/language.rs:1291:26
[INFO] [stdout]      |
[INFO] [stdout] 1291 |             Self::Symbol(builder) => todo!(),
[INFO] [stdout]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:294:32
[INFO] [stdout]     |
[INFO] [stdout] 294 |     fn verify_structure(&self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:677:62
[INFO] [stdout]     |
[INFO] [stdout] 677 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:713:62
[INFO] [stdout]     |
[INFO] [stdout] 713 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:746:49
[INFO] [stdout]     |
[INFO] [stdout] 746 |     fn verify_structure(&self, tags: &TagIndex, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:897:33
[INFO] [stdout]     |
[INFO] [stdout] 897 |     fn unicorn_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:905:31
[INFO] [stdout]     |
[INFO] [stdout] 905 |     fn unicorn_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:913:28
[INFO] [stdout]     |
[INFO] [stdout] 913 |     fn em_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `errors`
[INFO] [stdout]    --> src/builders/text.rs:921:26
[INFO] [stdout]     |
[INFO] [stdout] 921 |     fn em_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/builders/text.rs:296:13
[INFO] [stdout]     |
[INFO] [stdout] 296 |         let mut found_error = false;
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/builders/text.rs:296:13
[INFO] [stdout]     |
[INFO] [stdout] 296 |         let mut found_error = false;
[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: field is never read: `id`
[INFO] [stdout]     --> src/builders/language.rs:1016:5
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     id: String,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `systems`
[INFO] [stdout]   --> src/deduction/directory.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     systems: Vec<System>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `types`
[INFO] [stdout]   --> src/deduction/directory.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     types: Vec<Type>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> src/deduction/mod.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 90 |     id: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 159 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:160:5
[INFO] [stdout]     |
[INFO] [stdout] 160 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:177:5
[INFO] [stdout]     |
[INFO] [stdout] 177 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:336:5
[INFO] [stdout]     |
[INFO] [stdout] 336 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:337:5
[INFO] [stdout]     |
[INFO] [stdout] 337 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `local_directory`
[INFO] [stdout]    --> src/deduction/mod.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     local_directory: LocalCheckableDirectory,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:385:5
[INFO] [stdout]     |
[INFO] [stdout] 385 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:386:5
[INFO] [stdout]     |
[INFO] [stdout] 386 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `local_directory`
[INFO] [stdout]    --> src/deduction/mod.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     local_directory: LocalCheckableDirectory,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]     --> src/builders/language.rs:1016:5
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     id: String,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `systems`
[INFO] [stdout]   --> src/deduction/directory.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     systems: Vec<System>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `types`
[INFO] [stdout]   --> src/deduction/directory.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     types: Vec<Type>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> src/deduction/mod.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 90 |     id: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 159 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:160:5
[INFO] [stdout]     |
[INFO] [stdout] 160 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:177:5
[INFO] [stdout]     |
[INFO] [stdout] 177 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:336:5
[INFO] [stdout]     |
[INFO] [stdout] 336 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:337:5
[INFO] [stdout]     |
[INFO] [stdout] 337 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `local_directory`
[INFO] [stdout]    --> src/deduction/mod.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     local_directory: LocalCheckableDirectory,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]    --> src/deduction/mod.rs:385:5
[INFO] [stdout]     |
[INFO] [stdout] 385 |     id: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `system`
[INFO] [stdout]    --> src/deduction/mod.rs:386:5
[INFO] [stdout]     |
[INFO] [stdout] 386 |     system: SystemRef,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `local_directory`
[INFO] [stdout]    --> src/deduction/mod.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     local_directory: LocalCheckableDirectory,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 47.38s
[INFO] running `Command { std: "docker" "inspect" "6ddd99a67eaf5dbb702b23b9b61d7180b16274f1a488916d8696855f1d21c91f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ddd99a67eaf5dbb702b23b9b61d7180b16274f1a488916d8696855f1d21c91f", kill_on_drop: false }`
[INFO] [stdout] 6ddd99a67eaf5dbb702b23b9b61d7180b16274f1a488916d8696855f1d21c91f