[INFO] cloning repository https://github.com/lancatlin/brainfuck-interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lancatlin/brainfuck-interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flancatlin%2Fbrainfuck-interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flancatlin%2Fbrainfuck-interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c68a3a6075f9c768a389454cacf5bf9489307772
[INFO] checking lancatlin/brainfuck-interpreter 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%2Flancatlin%2Fbrainfuck-interpreter" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/lancatlin/brainfuck-interpreter
[INFO] finished tweaking git repo https://github.com/lancatlin/brainfuck-interpreter
[INFO] tweaked toml for git repo https://github.com/lancatlin/brainfuck-interpreter written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/lancatlin/brainfuck-interpreter 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/lancatlin/brainfuck-interpreter 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 72248b272f34fde7fef6d6a866c88bc60c584dd425d0a0d157b745f76bd91e37
[INFO] running `Command { std: "docker" "start" "-a" "72248b272f34fde7fef6d6a866c88bc60c584dd425d0a0d157b745f76bd91e37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72248b272f34fde7fef6d6a866c88bc60c584dd425d0a0d157b745f76bd91e37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72248b272f34fde7fef6d6a866c88bc60c584dd425d0a0d157b745f76bd91e37", kill_on_drop: false }`
[INFO] [stdout] 72248b272f34fde7fef6d6a866c88bc60c584dd425d0a0d157b745f76bd91e37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] a86c09f924219830a9ef0f609d3d55c5cd0768f331e64f206146559af4449c13
[INFO] running `Command { std: "docker" "start" "-a" "a86c09f924219830a9ef0f609d3d55c5cd0768f331e64f206146559af4449c13", kill_on_drop: false }`
[INFO] [stderr]     Checking brainfuck v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:4:81
[INFO] [stdout]    |
[INFO] [stdout]  4 |   fn execute_from_string(program: String, input: String) -> Result<String, Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout]  5 | |     let program = Cursor::new(program.as_bytes());
[INFO] [stdout]  6 | |     let input = Cursor::new(input.as_bytes());
[INFO] [stdout]  7 | |     let mut output = BufWriter::new(Vec::new());
[INFO] [stdout] ...  |
[INFO] [stdout] 10 | |     Ok(String::from_utf8(output.buffer().to_vec()).unwrap())
[INFO] [stdout] 11 | | }
[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<String, brainfuck::Error>
[INFO] [stdout]  --> tests/integration_test.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     interpreter.execute()?;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Ok(String::from_utf8(output.buffer().to_vec()).unwrap())
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!("a", execute_from_string(code, input).unwrap());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:24:21
[INFO] [stdout]    |
[INFO] [stdout] 24 |     assert_eq!("c", execute_from_string(code, input).unwrap());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         execute_from_string(code, "".to_string()).unwrap()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:42:26
[INFO] [stdout]    |
[INFO] [stdout] 42 |     assert_eq!("WANCAT", execute_from_string(code, input).unwrap());
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, brainfuck::Error>
[INFO] [stdout]   --> tests/integration_test.rs:49:34
[INFO] [stdout]    |
[INFO] [stdout] 49 |     assert_eq!("Hello World!\n", execute_from_string(code, input).unwrap());
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `brainfuck` (test "integration_test") due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a86c09f924219830a9ef0f609d3d55c5cd0768f331e64f206146559af4449c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a86c09f924219830a9ef0f609d3d55c5cd0768f331e64f206146559af4449c13", kill_on_drop: false }`
[INFO] [stdout] a86c09f924219830a9ef0f609d3d55c5cd0768f331e64f206146559af4449c13
