[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] testing TopologicallySpeaking/ckproof against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTopologicallySpeaking%2Fckproof" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TopologicallySpeaking/ckproof on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "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-4/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" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 40cf440d7bd4330c0d840e8717ecc24d72d034f9bf4b88f77b81b57c6be9383c
[INFO] running `Command { std: "docker" "start" "-a" "40cf440d7bd4330c0d840e8717ecc24d72d034f9bf4b88f77b81b57c6be9383c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40cf440d7bd4330c0d840e8717ecc24d72d034f9bf4b88f77b81b57c6be9383c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40cf440d7bd4330c0d840e8717ecc24d72d034f9bf4b88f77b81b57c6be9383c", kill_on_drop: false }`
[INFO] [stdout] 40cf440d7bd4330c0d840e8717ecc24d72d034f9bf4b88f77b81b57c6be9383c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eee98a88047e37b17fe2d9f13f38912ddd3904a6f7044bfff388b7ba887c39c1
[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" "eee98a88047e37b17fe2d9f13f38912ddd3904a6f7044bfff388b7ba887c39c1", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling ckproof v0.1.0 (/opt/rustwide/workdir)
[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: 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: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 01s
[INFO] running `Command { std: "docker" "inspect" "eee98a88047e37b17fe2d9f13f38912ddd3904a6f7044bfff388b7ba887c39c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eee98a88047e37b17fe2d9f13f38912ddd3904a6f7044bfff388b7ba887c39c1", kill_on_drop: false }`
[INFO] [stdout] eee98a88047e37b17fe2d9f13f38912ddd3904a6f7044bfff388b7ba887c39c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--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] 8b32a96a01d1fb9961a5d078ea669bddb08025efc7d458313d1522e1e8d224f3
[INFO] running `Command { std: "docker" "start" "-a" "8b32a96a01d1fb9961a5d078ea669bddb08025efc7d458313d1522e1e8d224f3", kill_on_drop: false }`
[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: 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: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ckproof v0.1.0 (/opt/rustwide/workdir)
[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: 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: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.22s
[INFO] running `Command { std: "docker" "inspect" "8b32a96a01d1fb9961a5d078ea669bddb08025efc7d458313d1522e1e8d224f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b32a96a01d1fb9961a5d078ea669bddb08025efc7d458313d1522e1e8d224f3", kill_on_drop: false }`
[INFO] [stdout] 8b32a96a01d1fb9961a5d078ea669bddb08025efc7d458313d1522e1e8d224f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", 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] 0433b91af80d0ea0f13de12688c8a8dd6faa26f7a8cb115e513ed4731f35d90d
[INFO] running `Command { std: "docker" "start" "-a" "0433b91af80d0ea0f13de12688c8a8dd6faa26f7a8cb115e513ed4731f35d90d", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]     --> src/builders/language.rs:1049:47
[INFO] [stderr]      |
[INFO] [stderr] 1049 |     fn build(&self, local_index: &LocalIndex, errors: &mut ParsingErrorContext) {
[INFO] [stderr]      |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1267:26
[INFO] [stderr]      |
[INFO] [stderr] 1267 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1277:26
[INFO] [stderr]      |
[INFO] [stderr] 1277 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1291:26
[INFO] [stderr]      |
[INFO] [stderr] 1291 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:294:32
[INFO] [stderr]     |
[INFO] [stderr] 294 |     fn verify_structure(&self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:677:62
[INFO] [stderr]     |
[INFO] [stderr] 677 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:713:62
[INFO] [stderr]     |
[INFO] [stderr] 713 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:746:49
[INFO] [stderr]     |
[INFO] [stderr] 746 |     fn verify_structure(&self, tags: &TagIndex, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:897:33
[INFO] [stderr]     |
[INFO] [stderr] 897 |     fn unicorn_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:905:31
[INFO] [stderr]     |
[INFO] [stderr] 905 |     fn unicorn_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:913:28
[INFO] [stderr]     |
[INFO] [stderr] 913 |     fn em_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:921:26
[INFO] [stderr]     |
[INFO] [stderr] 921 |     fn em_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builders/text.rs:296:13
[INFO] [stderr]     |
[INFO] [stderr] 296 |         let mut found_error = false;
[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: field is never read: `id`
[INFO] [stderr]     --> src/builders/language.rs:1016:5
[INFO] [stderr]      |
[INFO] [stderr] 1016 |     id: String,
[INFO] [stderr]      |     ^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `systems`
[INFO] [stderr]   --> src/deduction/directory.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     systems: Vec<System>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `types`
[INFO] [stderr]   --> src/deduction/directory.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     types: Vec<Type>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]   --> src/deduction/mod.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     id: String,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:102:5
[INFO] [stderr]     |
[INFO] [stderr] 102 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:159:5
[INFO] [stderr]     |
[INFO] [stderr] 159 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:160:5
[INFO] [stderr]     |
[INFO] [stderr] 160 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:177:5
[INFO] [stderr]     |
[INFO] [stderr] 177 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:336:5
[INFO] [stderr]     |
[INFO] [stderr] 336 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:337:5
[INFO] [stderr]     |
[INFO] [stderr] 337 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `local_directory`
[INFO] [stderr]    --> src/deduction/mod.rs:338:5
[INFO] [stderr]     |
[INFO] [stderr] 338 |     local_directory: LocalCheckableDirectory,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:385:5
[INFO] [stderr]     |
[INFO] [stderr] 385 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:386:5
[INFO] [stderr]     |
[INFO] [stderr] 386 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `local_directory`
[INFO] [stderr]    --> src/deduction/mod.rs:387:5
[INFO] [stderr]     |
[INFO] [stderr] 387 |     local_directory: LocalCheckableDirectory,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 28 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]     --> src/builders/language.rs:1049:47
[INFO] [stderr]      |
[INFO] [stderr] 1049 |     fn build(&self, local_index: &LocalIndex, errors: &mut ParsingErrorContext) {
[INFO] [stderr]      |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1267:26
[INFO] [stderr]      |
[INFO] [stderr] 1267 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1277:26
[INFO] [stderr]      |
[INFO] [stderr] 1277 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `builder`
[INFO] [stderr]     --> src/builders/language.rs:1291:26
[INFO] [stderr]      |
[INFO] [stderr] 1291 |             Self::Symbol(builder) => todo!(),
[INFO] [stderr]      |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_builder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:294:32
[INFO] [stderr]     |
[INFO] [stderr] 294 |     fn verify_structure(&self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:677:62
[INFO] [stderr]     |
[INFO] [stderr] 677 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:713:62
[INFO] [stderr]     |
[INFO] [stderr] 713 |     fn verify_structure(&self, directory: &BuilderDirectory, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:746:49
[INFO] [stderr]     |
[INFO] [stderr] 746 |     fn verify_structure(&self, tags: &TagIndex, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:897:33
[INFO] [stderr]     |
[INFO] [stderr] 897 |     fn unicorn_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:905:31
[INFO] [stderr]     |
[INFO] [stderr] 905 |     fn unicorn_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:913:28
[INFO] [stderr]     |
[INFO] [stderr] 913 |     fn em_begin(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `errors`
[INFO] [stderr]    --> src/builders/text.rs:921:26
[INFO] [stderr]     |
[INFO] [stderr] 921 |     fn em_end(&mut self, errors: &mut ParsingErrorContext) {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_errors`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builders/text.rs:296:13
[INFO] [stderr]     |
[INFO] [stderr] 296 |         let mut found_error = false;
[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: field is never read: `id`
[INFO] [stderr]     --> src/builders/language.rs:1016:5
[INFO] [stderr]      |
[INFO] [stderr] 1016 |     id: String,
[INFO] [stderr]      |     ^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `systems`
[INFO] [stderr]   --> src/deduction/directory.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     systems: Vec<System>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `types`
[INFO] [stderr]   --> src/deduction/directory.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     types: Vec<Type>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]   --> src/deduction/mod.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     id: String,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:102:5
[INFO] [stderr]     |
[INFO] [stderr] 102 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:159:5
[INFO] [stderr]     |
[INFO] [stderr] 159 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:160:5
[INFO] [stderr]     |
[INFO] [stderr] 160 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:177:5
[INFO] [stderr]     |
[INFO] [stderr] 177 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:336:5
[INFO] [stderr]     |
[INFO] [stderr] 336 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:337:5
[INFO] [stderr]     |
[INFO] [stderr] 337 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `local_directory`
[INFO] [stderr]    --> src/deduction/mod.rs:338:5
[INFO] [stderr]     |
[INFO] [stderr] 338 |     local_directory: LocalCheckableDirectory,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `id`
[INFO] [stderr]    --> src/deduction/mod.rs:385:5
[INFO] [stderr]     |
[INFO] [stderr] 385 |     id: String,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `system`
[INFO] [stderr]    --> src/deduction/mod.rs:386:5
[INFO] [stderr]     |
[INFO] [stderr] 386 |     system: SystemRef,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `local_directory`
[INFO] [stderr]    --> src/deduction/mod.rs:387:5
[INFO] [stderr]     |
[INFO] [stderr] 387 |     local_directory: LocalCheckableDirectory,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 28 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ckproof-b3d6636c1f1e90f4
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ckproof-1a215c40141c5679
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ckproof
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0433b91af80d0ea0f13de12688c8a8dd6faa26f7a8cb115e513ed4731f35d90d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0433b91af80d0ea0f13de12688c8a8dd6faa26f7a8cb115e513ed4731f35d90d", kill_on_drop: false }`
[INFO] [stdout] 0433b91af80d0ea0f13de12688c8a8dd6faa26f7a8cb115e513ed4731f35d90d