[INFO] cloning repository https://github.com/thiago-figueredo/math-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thiago-figueredo/math-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthiago-figueredo%2Fmath-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthiago-figueredo%2Fmath-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de3fd2cc3bc875dc11ae7f74ca86304fd7163666
[INFO] testing thiago-figueredo/math-lang against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthiago-figueredo%2Fmath-lang" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/thiago-figueredo/math-lang
[INFO] finished tweaking git repo https://github.com/thiago-figueredo/math-lang
[INFO] tweaked toml for git repo https://github.com/thiago-figueredo/math-lang written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/thiago-figueredo/math-lang on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/thiago-figueredo/math-lang 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" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 261b61bb420f8f54fec44e05b94adb792af134861c81be020815234c85d83af4
[INFO] running `Command { std: "docker" "start" "-a" "261b61bb420f8f54fec44e05b94adb792af134861c81be020815234c85d83af4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "261b61bb420f8f54fec44e05b94adb792af134861c81be020815234c85d83af4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "261b61bb420f8f54fec44e05b94adb792af134861c81be020815234c85d83af4", kill_on_drop: false }`
[INFO] [stdout] 261b61bb420f8f54fec44e05b94adb792af134861c81be020815234c85d83af4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89bd4002a67e2fed3eec4767843aead22a429e439c8aaf5617b39cda6f0ceaf9
[INFO] running `Command { std: "docker" "start" "-a" "89bd4002a67e2fed3eec4767843aead22a429e439c8aaf5617b39cda6f0ceaf9", kill_on_drop: false }`
[INFO] [stderr]    Compiling math-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Bindings`
[INFO] [stdout]  --> src/main.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | use expr::{Bindings, Expr};
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rule::Rule`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rule::Rule;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Sentence` is never constructed
[INFO] [stdout]  --> src/expr.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum Expr {
[INFO] [stdout]   |          ---- variant in this enum
[INFO] [stdout] 7 |     Symbol(String),
[INFO] [stdout] 8 |     Sentence(Vec<Expr>),
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Expr` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Bindings` is never used
[INFO] [stdout]   --> src/expr.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub type Bindings = HashMap<String, Expr>;
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `sentence`, `pattern_match`, and `pattern_matches` are never used
[INFO] [stdout]    --> src/expr.rs:54:12
[INFO] [stdout]     |
[INFO] [stdout]  42 | impl Expr {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  54 |     pub fn sentence(args: Vec<Self>) -> Self {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  92 |     pub fn pattern_match(&self, expr: &Expr) -> Option<Bindings> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 119 |     fn pattern_matches(pattern: &Expr, expr: &Expr, bindings: &mut Bindings) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rule` is never constructed
[INFO] [stdout]  --> src/rule.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Rule {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `make`, `apply_all`, and `substitute_bindings` are never used
[INFO] [stdout]   --> src/rule.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Rule {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     #[inline]
[INFO] [stdout] 18 |     pub fn make(head: Expr, body: Expr) -> Self {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn apply_all(&self, expr: Expr) -> Expr {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub fn substitute_bindings(&self, bindings: &Bindings, expr: &Expr) -> Expr {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/expr.rs:18:21
[INFO] [stdout]    |
[INFO] [stdout] 18 |                     write!(f, "{}", expr);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |                     let _ = write!(f, "{}", expr);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "89bd4002a67e2fed3eec4767843aead22a429e439c8aaf5617b39cda6f0ceaf9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89bd4002a67e2fed3eec4767843aead22a429e439c8aaf5617b39cda6f0ceaf9", kill_on_drop: false }`
[INFO] [stdout] 89bd4002a67e2fed3eec4767843aead22a429e439c8aaf5617b39cda6f0ceaf9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 862572a877e0dcba8149f46ef20e764cb5e77828cf7fd84af12b3e62a1d5b9a5
[INFO] running `Command { std: "docker" "start" "-a" "862572a877e0dcba8149f46ef20e764cb5e77828cf7fd84af12b3e62a1d5b9a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling math-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Bindings`
[INFO] [stdout]  --> src/main.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | use expr::{Bindings, Expr};
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rule::Rule`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rule::Rule;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Sentence` is never constructed
[INFO] [stdout]  --> src/expr.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum Expr {
[INFO] [stdout]   |          ---- variant in this enum
[INFO] [stdout] 7 |     Symbol(String),
[INFO] [stdout] 8 |     Sentence(Vec<Expr>),
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Expr` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Bindings` is never used
[INFO] [stdout]   --> src/expr.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub type Bindings = HashMap<String, Expr>;
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `sentence`, `pattern_match`, and `pattern_matches` are never used
[INFO] [stdout]    --> src/expr.rs:54:12
[INFO] [stdout]     |
[INFO] [stdout]  42 | impl Expr {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  54 |     pub fn sentence(args: Vec<Self>) -> Self {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  92 |     pub fn pattern_match(&self, expr: &Expr) -> Option<Bindings> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 119 |     fn pattern_matches(pattern: &Expr, expr: &Expr, bindings: &mut Bindings) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rule` is never constructed
[INFO] [stdout]  --> src/rule.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Rule {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `make`, `apply_all`, and `substitute_bindings` are never used
[INFO] [stdout]   --> src/rule.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Rule {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     #[inline]
[INFO] [stdout] 18 |     pub fn make(head: Expr, body: Expr) -> Self {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn apply_all(&self, expr: Expr) -> Expr {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub fn substitute_bindings(&self, bindings: &Bindings, expr: &Expr) -> Expr {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/expr.rs:18:21
[INFO] [stdout]    |
[INFO] [stdout] 18 |                     write!(f, "{}", expr);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |                     let _ = write!(f, "{}", expr);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "862572a877e0dcba8149f46ef20e764cb5e77828cf7fd84af12b3e62a1d5b9a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "862572a877e0dcba8149f46ef20e764cb5e77828cf7fd84af12b3e62a1d5b9a5", kill_on_drop: false }`
[INFO] [stdout] 862572a877e0dcba8149f46ef20e764cb5e77828cf7fd84af12b3e62a1d5b9a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8fc5f4f2d66690ad69c1e6dbf9b62613fff1cc8ce8c56113c9b21a2dd7b87fcc
[INFO] running `Command { std: "docker" "start" "-a" "8fc5f4f2d66690ad69c1e6dbf9b62613fff1cc8ce8c56113c9b21a2dd7b87fcc", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `Bindings`
[INFO] [stderr]  --> src/main.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | use expr::{Bindings, Expr};
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rule::Rule`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rule::Rule;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Sentence` is never constructed
[INFO] [stderr]  --> src/expr.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub enum Expr {
[INFO] [stderr]   |          ---- variant in this enum
[INFO] [stderr] 7 |     Symbol(String),
[INFO] [stderr] 8 |     Sentence(Vec<Expr>),
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Expr` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias `Bindings` is never used
[INFO] [stderr]   --> src/expr.rs:40:10
[INFO] [stderr]    |
[INFO] [stderr] 40 | pub type Bindings = HashMap<String, Expr>;
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `sentence`, `pattern_match`, and `pattern_matches` are never used
[INFO] [stderr]    --> src/expr.rs:54:12
[INFO] [stderr]     |
[INFO] [stderr]  42 | impl Expr {
[INFO] [stderr]     | --------- associated items in this implementation
[INFO] [stderr] ...
[INFO] [stderr]  54 |     pub fn sentence(args: Vec<Self>) -> Self {
[INFO] [stderr]     |            ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  92 |     pub fn pattern_match(&self, expr: &Expr) -> Option<Bindings> {
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 119 |     fn pattern_matches(pattern: &Expr, expr: &Expr, bindings: &mut Bindings) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Rule` is never constructed
[INFO] [stderr]  --> src/rule.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Rule {
[INFO] [stderr]   |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `make`, `apply_all`, and `substitute_bindings` are never used
[INFO] [stderr]   --> src/rule.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl Rule {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 17 |     #[inline]
[INFO] [stderr] 18 |     pub fn make(head: Expr, body: Expr) -> Self {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 22 |     pub fn apply_all(&self, expr: Expr) -> Expr {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 50 |     pub fn substitute_bindings(&self, bindings: &Bindings, expr: &Expr) -> Expr {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/expr.rs:18:21
[INFO] [stderr]    |
[INFO] [stderr] 18 |                     write!(f, "{}", expr);
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 18 |                     let _ = write!(f, "{}", expr);
[INFO] [stderr]    |                     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `math-lang` (bin "math-lang" test) generated 9 warnings (run `cargo fix --bin "math-lang" --tests` to apply 3 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/math_lang-2d33324ec7515aed)
[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" "8fc5f4f2d66690ad69c1e6dbf9b62613fff1cc8ce8c56113c9b21a2dd7b87fcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fc5f4f2d66690ad69c1e6dbf9b62613fff1cc8ce8c56113c9b21a2dd7b87fcc", kill_on_drop: false }`
[INFO] [stdout] 8fc5f4f2d66690ad69c1e6dbf9b62613fff1cc8ce8c56113c9b21a2dd7b87fcc