[INFO] cloning repository https://github.com/mathiusj/calc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mathiusj/calc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmathiusj%2Fcalc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmathiusj%2Fcalc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 498bc6ad49cef9872416e56903eddb13f484cc42
[INFO] checking mathiusj/calc 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%2Fmathiusj%2Fcalc" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mathiusj/calc
[INFO] finished tweaking git repo https://github.com/mathiusj/calc
[INFO] tweaked toml for git repo https://github.com/mathiusj/calc written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mathiusj/calc 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/mathiusj/calc 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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 30b750830212b7e6d4e1bba94087a05b67195e6eeeb703272fbf31a2d317a061
[INFO] running `Command { std: "docker" "start" "-a" "30b750830212b7e6d4e1bba94087a05b67195e6eeeb703272fbf31a2d317a061", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30b750830212b7e6d4e1bba94087a05b67195e6eeeb703272fbf31a2d317a061", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30b750830212b7e6d4e1bba94087a05b67195e6eeeb703272fbf31a2d317a061", kill_on_drop: false }`
[INFO] [stdout] 30b750830212b7e6d4e1bba94087a05b67195e6eeeb703272fbf31a2d317a061
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 31bd751a778d06d7f8f99899dd794d5d641b7c8225e8ff349aeea1f1090298fb
[INFO] running `Command { std: "docker" "start" "-a" "31bd751a778d06d7f8f99899dd794d5d641b7c8225e8ff349aeea1f1090298fb", kill_on_drop: false }`
[INFO] [stderr]     Checking calc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |         ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         (Some(left), Some(right)) => {
[INFO] [stdout]    |         ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |         ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |         ^^^^^^^^^ collectively making this unreachable
[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:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         (_, _) => {
[INFO] [stdout]    |         ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         (Some(left), Some(right)) => {
[INFO] [stdout]    |         ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |         ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 39 |         (_, _) => {
[INFO] [stdout]    |         ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `callback`
[INFO] [stdout]   --> src/lib.rs:27:35
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |                                   ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_callback`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:36:10
[INFO] [stdout]    |
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 51 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 61 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 51 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 61 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:76:21
[INFO] [stdout]    |
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:76:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 79 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |         ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         (Some(left), Some(right)) => {
[INFO] [stdout]    |         ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |         ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |         ^^^^^^^^^ collectively making this unreachable
[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:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         (_, _) => {
[INFO] [stdout]    |         ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         (Some(left), Some(right)) => {
[INFO] [stdout]    |         ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |         ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 39 |         (_, _) => {
[INFO] [stdout]    |         ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:54:25
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:72:25
[INFO] [stdout]    |
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:76:22
[INFO] [stdout]    |
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expr` is never used
[INFO] [stdout]  --> src/lib.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum 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: enum `EvalError` is never used
[INFO] [stdout]   --> src/lib.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum EvalError {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]   --> src/lib.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn eval(expr: &Expr) -> Result<i64, EvalError> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParseError` is never used
[INFO] [stdout]   --> src/lib.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum ParseError {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `popStack` is never used
[INFO] [stdout]   --> src/lib.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]   --> src/lib.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn parse(input: &str) -> Result<Expr, ParseError> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:14:48
[INFO] [stdout]    |
[INFO] [stdout] 14 |   fn eval(expr: &Expr) -> Result<i64, EvalError> {
[INFO] [stdout]    |  ________________________________________________^
[INFO] [stdout] 15 | |     match expr {
[INFO] [stdout] 16 | |         Expr::Number(x) => Ok(*x),
[INFO] [stdout] 17 | |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout] ...  |
[INFO] [stdout] 20 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | /     match expr {
[INFO] [stdout] 16 | |         Expr::Number(x) => Ok(*x),
[INFO] [stdout] 17 | |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout] 18 | |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout] 19 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:16:28
[INFO] [stdout]    |
[INFO] [stdout] 16 |         Expr::Number(x) => Ok(*x),
[INFO] [stdout]    |                            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:40
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `popStack` should have a snake case name
[INFO] [stdout]   --> src/lib.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |    ^^^^^^^^ help: convert the identifier to snake case: `pop_stack`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `callback`
[INFO] [stdout]   --> src/lib.rs:27:35
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |                                   ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_callback`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         (_, right) =>{
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:36:10
[INFO] [stdout]    |
[INFO] [stdout] 36 |         (left, _) =>{
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 51 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 61 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 51 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 61 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:76:21
[INFO] [stdout]    |
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:76:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                     ^^^^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lib.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/lib.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |                     (Some(left), Some(right)) => {
[INFO] [stdout]    |                     ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                     ---------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 79 |                     (_, _) => {
[INFO] [stdout]    |                     ^^^^^^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:54:25
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     (_, right) =>{
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     (left, _) =>{
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/lib.rs:72:25
[INFO] [stdout]    |
[INFO] [stdout] 72 |                     (_, right) =>{
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/lib.rs:76:22
[INFO] [stdout]    |
[INFO] [stdout] 76 |                     (left, _) =>{
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `popStack` is never used
[INFO] [stdout]   --> src/lib.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:14:48
[INFO] [stdout]    |
[INFO] [stdout] 14 |   fn eval(expr: &Expr) -> Result<i64, EvalError> {
[INFO] [stdout]    |  ________________________________________________^
[INFO] [stdout] 15 | |     match expr {
[INFO] [stdout] 16 | |         Expr::Number(x) => Ok(*x),
[INFO] [stdout] 17 | |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout] ...  |
[INFO] [stdout] 20 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | /     match expr {
[INFO] [stdout] 16 | |         Expr::Number(x) => Ok(*x),
[INFO] [stdout] 17 | |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout] 18 | |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout] 19 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:16:28
[INFO] [stdout]    |
[INFO] [stdout] 16 |         Expr::Number(x) => Ok(*x),
[INFO] [stdout]    |                            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:17:52
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Expr::Add(left, right) => Ok(eval(left)? + eval(right)?),
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:40
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:43
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, EvalError>, i64>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]   --> src/lib.rs:18:57
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Expr::Subtract(left, right) => Ok(eval(left)? - eval(right)?),
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `popStack` should have a snake case name
[INFO] [stdout]   --> src/lib.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn popStack(mut stack: Vec<Expr>, callback: Expr) {
[INFO] [stdout]    |    ^^^^^^^^ help: convert the identifier to snake case: `pop_stack`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]    --> src/lib.rs:104:21
[INFO] [stdout]     |
[INFO] [stdout] 104 |         let value = eval(&expr).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]    --> src/lib.rs:114:21
[INFO] [stdout]     |
[INFO] [stdout] 114 |         let value = eval(&expr).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]    --> src/lib.rs:122:21
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let value = eval(&expr).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i64, EvalError>
[INFO] [stdout]    --> src/lib.rs:131:21
[INFO] [stdout]     |
[INFO] [stdout] 131 |         let value = eval(&expr).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `calc` (lib) due to 17 previous errors; 20 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `calc` (lib test) due to 21 previous errors; 15 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "31bd751a778d06d7f8f99899dd794d5d641b7c8225e8ff349aeea1f1090298fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31bd751a778d06d7f8f99899dd794d5d641b7c8225e8ff349aeea1f1090298fb", kill_on_drop: false }`
[INFO] [stdout] 31bd751a778d06d7f8f99899dd794d5d641b7c8225e8ff349aeea1f1090298fb
