[INFO] cloning repository https://github.com/pmukhin/calc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pmukhin/calc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpmukhin%2Fcalc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpmukhin%2Fcalc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c1837ac177ce258481e2edfe5239704f5f3c3a3f
[INFO] checking pmukhin/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%2Fpmukhin%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/pmukhin/calc
[INFO] finished tweaking git repo https://github.com/pmukhin/calc
[INFO] tweaked toml for git repo https://github.com/pmukhin/calc written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/pmukhin/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/pmukhin/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] 6cba3e3029bf83388fbe80b4dcd946a6c46d83d1b3f1c9dac20ebee9000c3aae
[INFO] running `Command { std: "docker" "start" "-a" "6cba3e3029bf83388fbe80b4dcd946a6c46d83d1b3f1c9dac20ebee9000c3aae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6cba3e3029bf83388fbe80b4dcd946a6c46d83d1b3f1c9dac20ebee9000c3aae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cba3e3029bf83388fbe80b4dcd946a6c46d83d1b3f1c9dac20ebee9000c3aae", kill_on_drop: false }`
[INFO] [stdout] 6cba3e3029bf83388fbe80b4dcd946a6c46d83d1b3f1c9dac20ebee9000c3aae
[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] 748c2108c8fa415f82a03d1456db347bc4add936b8457590b2a4d27efe0ebee3
[INFO] running `Command { std: "docker" "start" "-a" "748c2108c8fa415f82a03d1456db347bc4add936b8457590b2a4d27efe0ebee3", kill_on_drop: false }`
[INFO] [stderr]     Checking calc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/main.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let result = eval.exec(&ast)?;
[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<i32, eval::Error>
[INFO] [stdout]   --> src/main.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let result = eval.exec(&ast)?;
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:13:58
[INFO] [stdout]    |
[INFO] [stdout] 13 |       pub fn exec(&self, ast: &Expr) -> Result<i32, Error> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 14 | |         match ast {
[INFO] [stdout] 15 | |             Expr::Number(n) => Ok(*n),
[INFO] [stdout] 16 | |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout] ...  |
[INFO] [stdout] 21 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         match ast {
[INFO] [stdout] 15 | |             Expr::Number(n) => Ok(*n),
[INFO] [stdout] 16 | |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout] 17 | |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout] 18 | |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout] 19 | |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout] 20 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:15:32
[INFO] [stdout]    |
[INFO] [stdout] 15 |             Expr::Number(n) => Ok(*n),
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:32
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:32
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:32
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:32
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/main.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let result = eval.exec(&ast)?;
[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<i32, eval::Error>
[INFO] [stdout]   --> src/main.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let result = eval.exec(&ast)?;
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:13:58
[INFO] [stdout]    |
[INFO] [stdout] 13 |       pub fn exec(&self, ast: &Expr) -> Result<i32, Error> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 14 | |         match ast {
[INFO] [stdout] 15 | |             Expr::Number(n) => Ok(*n),
[INFO] [stdout] 16 | |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout] ...  |
[INFO] [stdout] 21 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         match ast {
[INFO] [stdout] 15 | |             Expr::Number(n) => Ok(*n),
[INFO] [stdout] 16 | |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout] 17 | |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout] 18 | |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout] 19 | |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout] 20 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:15:32
[INFO] [stdout]    |
[INFO] [stdout] 15 |             Expr::Number(n) => Ok(*n),
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:32
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:16:51
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Expr::Mul(l, r) => Ok(self.exec(l)? * self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:32
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:17:51
[INFO] [stdout]    |
[INFO] [stdout] 17 |             Expr::Add(l, r) => Ok(self.exec(l)? + self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:32
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:35
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout] 18 |             Expr::Sub(l, r) => Ok(self.exec(l)? - self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:32
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:35
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, eval::Error>, i32>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:19:51
[INFO] [stdout]    |
[INFO] [stdout] 19 |             Expr::Div(l, r) => Ok(self.exec(l)? / self.exec(r)?),
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `calc` (bin "calc") due to 33 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:34:22
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let result = Eval::new().exec(&expr);
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 |         assert_eq!(result.unwrap(), 77);
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:44:22
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let result = Eval::new().exec(&expr);
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i32, eval::Error>
[INFO] [stdout]   --> src/eval.rs:45:20
[INFO] [stdout]    |
[INFO] [stdout] 45 |         assert_eq!(result.unwrap(), 1);
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `calc` (bin "calc" test) due to 37 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "748c2108c8fa415f82a03d1456db347bc4add936b8457590b2a4d27efe0ebee3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "748c2108c8fa415f82a03d1456db347bc4add936b8457590b2a4d27efe0ebee3", kill_on_drop: false }`
[INFO] [stdout] 748c2108c8fa415f82a03d1456db347bc4add936b8457590b2a4d27efe0ebee3