[INFO] cloning repository https://github.com/Simppu/rsolver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Simppu/rsolver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSimppu%2Frsolver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSimppu%2Frsolver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 476f5acefab731cf3056c2f38b15a1b662db9cec
[INFO] checking Simppu/rsolver against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSimppu%2Frsolver" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Simppu/rsolver
[INFO] finished tweaking git repo https://github.com/Simppu/rsolver
[INFO] tweaked toml for git repo https://github.com/Simppu/rsolver written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Simppu/rsolver on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Simppu/rsolver 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1293efc082ebea2fba7217fead5c664308d2c40ec0bc7571f8a0a9c891631821
[INFO] running `Command { std: "docker" "start" "-a" "1293efc082ebea2fba7217fead5c664308d2c40ec0bc7571f8a0a9c891631821", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1293efc082ebea2fba7217fead5c664308d2c40ec0bc7571f8a0a9c891631821", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1293efc082ebea2fba7217fead5c664308d2c40ec0bc7571f8a0a9c891631821", kill_on_drop: false }`
[INFO] [stdout] 1293efc082ebea2fba7217fead5c664308d2c40ec0bc7571f8a0a9c891631821
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 082f376dce09739c8b173ed3cb19d893b1d70921bf9717d4a84fbace5e32eb56
[INFO] running `Command { std: "docker" "start" "-a" "082f376dce09739c8b173ed3cb19d893b1d70921bf9717d4a84fbace5e32eb56", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-complex v0.4.6
[INFO] [stderr]     Checking num-bigint v0.4.6
[INFO] [stderr]     Checking num-iter v0.1.45
[INFO] [stderr]     Checking num-rational v0.4.2
[INFO] [stderr]     Checking num v0.4.3
[INFO] [stderr]     Checking rsolver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Base`
[INFO] [stdout]  --> src/lib.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::tokenizer::{Base, Rational};
[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: `collections::HashMap`
[INFO] [stdout]  --> src/parser.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, iter::Peekable, string::ParseError};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rational`, `Token`, `Tokenizer`, and `parser::Parser`
[INFO] [stdout]  --> src/tests.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::{parser::Parser, tokenizer::{Rational, Token, Tokenizer}};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^              ^^^^^^^^  ^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub mod tests;
[INFO] [stdout]   | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Base`
[INFO] [stdout]  --> src/lib.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::tokenizer::{Base, Rational};
[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: `collections::HashMap`
[INFO] [stdout]  --> src/parser.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, iter::Peekable, string::ParseError};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> src/parser.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]   |               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/lib.rs:110:19
[INFO] [stdout]     |
[INFO] [stdout] 110 |         Expr::Pow(expr, expr1) => {
[INFO] [stdout]     |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr1`
[INFO] [stdout]    --> src/lib.rs:110:25
[INFO] [stdout]     |
[INFO] [stdout] 110 |         Expr::Pow(expr, expr1) => {
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_expr1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/lib.rs:156:28
[INFO] [stdout]     |
[INFO] [stdout] 156 |                         if let (coeff, symbol) = extract_coefficient(factors.clone()) {
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/lib.rs:291:19
[INFO] [stdout]     |
[INFO] [stdout] 291 |         Expr::Pow(a, b) => {
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/lib.rs:291:22
[INFO] [stdout]     |
[INFO] [stdout] 291 |         Expr::Pow(a, b) => {
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:514:21
[INFO] [stdout]     |
[INFO] [stdout] 337 |             Expr::Add(terms) => {
[INFO] [stdout]     |             ---------------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 514 |                     Expr::Add(v) if v[0] == Expr::Number(Rational::new(0, 1)) => v[1].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:515:21
[INFO] [stdout]     |
[INFO] [stdout] 337 |             Expr::Add(terms) => {
[INFO] [stdout]     |             ---------------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 515 |                     Expr::Add(v) if v[1] == Expr::Number(Rational::new(0, 1)) => v[0].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:516:21
[INFO] [stdout]     |
[INFO] [stdout] 400 |                     Expr::Mul(v) => {
[INFO] [stdout]     |                     ------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 516 |                     Expr::Mul(v) if v[0] == Expr::Number(Rational::new(1, 1)) => v[1].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:517:21
[INFO] [stdout]     |
[INFO] [stdout] 400 |                     Expr::Mul(v) => {
[INFO] [stdout]     |                     ------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 517 |                     Expr::Mul(v) if v[1] == Expr::Number(Rational::new(1, 1)) => v[0].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:339:29
[INFO] [stdout]     |
[INFO] [stdout] 339 |                         let mut simplified_terms: Vec<Expr> = terms.into_iter()
[INFO] [stdout]     |                             ----^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_expr` is never used
[INFO] [stdout]    --> src/lib.rs:547:4
[INFO] [stdout]     |
[INFO] [stdout] 547 | fn flatten_expr(expr: Expr) -> Expr {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_add` is never used
[INFO] [stdout]    --> src/lib.rs:569:4
[INFO] [stdout]     |
[INFO] [stdout] 569 | fn flatten_add(expr: Expr) -> Vec<Expr> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_mul` is never used
[INFO] [stdout]    --> src/lib.rs:576:4
[INFO] [stdout]     |
[INFO] [stdout] 576 | fn flatten_mul(expr: Expr) -> Vec<Expr> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_expr` is never used
[INFO] [stdout]  --> src/parser.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `peek` is never used
[INFO] [stdout]   --> src/parser.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl Parser{
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn peek(&mut self) -> Option<&Token> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Expr, Infallible>
[INFO] [stdout]   --> src/parser.rs:8:56
[INFO] [stdout]    |
[INFO] [stdout]  8 |   fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]    |  ________________________________________________________^
[INFO] [stdout]  9 | |     todo!()
[INFO] [stdout] 10 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rsolver` (lib) due to 1 previous error; 19 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> src/parser.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]   |               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/lib.rs:110:19
[INFO] [stdout]     |
[INFO] [stdout] 110 |         Expr::Pow(expr, expr1) => {
[INFO] [stdout]     |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rsolver` (lib test) due to 1 previous error; 18 warnings emitted
[INFO] [stdout] warning: unused variable: `expr1`
[INFO] [stdout]    --> src/lib.rs:110:25
[INFO] [stdout]     |
[INFO] [stdout] 110 |         Expr::Pow(expr, expr1) => {
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_expr1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/lib.rs:156:28
[INFO] [stdout]     |
[INFO] [stdout] 156 |                         if let (coeff, symbol) = extract_coefficient(factors.clone()) {
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/lib.rs:291:19
[INFO] [stdout]     |
[INFO] [stdout] 291 |         Expr::Pow(a, b) => {
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/lib.rs:291:22
[INFO] [stdout]     |
[INFO] [stdout] 291 |         Expr::Pow(a, b) => {
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:514:21
[INFO] [stdout]     |
[INFO] [stdout] 337 |             Expr::Add(terms) => {
[INFO] [stdout]     |             ---------------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 514 |                     Expr::Add(v) if v[0] == Expr::Number(Rational::new(0, 1)) => v[1].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:515:21
[INFO] [stdout]     |
[INFO] [stdout] 337 |             Expr::Add(terms) => {
[INFO] [stdout]     |             ---------------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 515 |                     Expr::Add(v) if v[1] == Expr::Number(Rational::new(0, 1)) => v[0].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:516:21
[INFO] [stdout]     |
[INFO] [stdout] 400 |                     Expr::Mul(v) => {
[INFO] [stdout]     |                     ------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 516 |                     Expr::Mul(v) if v[0] == Expr::Number(Rational::new(1, 1)) => v[1].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:517:21
[INFO] [stdout]     |
[INFO] [stdout] 400 |                     Expr::Mul(v) => {
[INFO] [stdout]     |                     ------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 517 |                     Expr::Mul(v) if v[1] == Expr::Number(Rational::new(1, 1)) => v[0].clone().simplify(),
[INFO] [stdout]     |                     ^^^^^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:339:29
[INFO] [stdout]     |
[INFO] [stdout] 339 |                         let mut simplified_terms: Vec<Expr> = terms.into_iter()
[INFO] [stdout]     |                             ----^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_expr` is never used
[INFO] [stdout]    --> src/lib.rs:547:4
[INFO] [stdout]     |
[INFO] [stdout] 547 | fn flatten_expr(expr: Expr) -> Expr {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_add` is never used
[INFO] [stdout]    --> src/lib.rs:569:4
[INFO] [stdout]     |
[INFO] [stdout] 569 | fn flatten_add(expr: Expr) -> Vec<Expr> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten_mul` is never used
[INFO] [stdout]    --> src/lib.rs:576:4
[INFO] [stdout]     |
[INFO] [stdout] 576 | fn flatten_mul(expr: Expr) -> Vec<Expr> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_expr` is never used
[INFO] [stdout]  --> src/parser.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `peek` is never used
[INFO] [stdout]   --> src/parser.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl Parser{
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn peek(&mut self) -> Option<&Token> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Expr, Infallible>
[INFO] [stdout]   --> src/parser.rs:8:56
[INFO] [stdout]    |
[INFO] [stdout]  8 |   fn parse_expr(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]    |  ________________________________________________________^
[INFO] [stdout]  9 | |     todo!()
[INFO] [stdout] 10 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "082f376dce09739c8b173ed3cb19d893b1d70921bf9717d4a84fbace5e32eb56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "082f376dce09739c8b173ed3cb19d893b1d70921bf9717d4a84fbace5e32eb56", kill_on_drop: false }`
[INFO] [stdout] 082f376dce09739c8b173ed3cb19d893b1d70921bf9717d4a84fbace5e32eb56
