[INFO] fetching crate rascal_vm 0.1.2...
[INFO] checking rascal_vm-0.1.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate rascal_vm 0.1.2 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate rascal_vm 0.1.2
[INFO] finished tweaking crates.io crate rascal_vm 0.1.2
[INFO] tweaked toml for crates.io crate rascal_vm 0.1.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rascal_vm 0.1.2 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] bb9995633d2a961abb941201ada1087e1e40c9510bf19850584b288afb7eac33
[INFO] running `Command { std: "docker" "start" "-a" "bb9995633d2a961abb941201ada1087e1e40c9510bf19850584b288afb7eac33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb9995633d2a961abb941201ada1087e1e40c9510bf19850584b288afb7eac33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb9995633d2a961abb941201ada1087e1e40c9510bf19850584b288afb7eac33", kill_on_drop: false }`
[INFO] [stdout] bb9995633d2a961abb941201ada1087e1e40c9510bf19850584b288afb7eac33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] e78decb7cfbe9e4b9dae99fdc85ca6d407746c70a36428fa0ced1e49274eb4b0
[INFO] running `Command { std: "docker" "start" "-a" "e78decb7cfbe9e4b9dae99fdc85ca6d407746c70a36428fa0ced1e49274eb4b0", kill_on_drop: false }`
[INFO] [stderr]     Checking rascal_scanner v0.1.2
[INFO] [stderr]     Checking rascal_bytecode v0.1.2
[INFO] [stderr]     Checking rascal_parser v0.1.2
[INFO] [stderr]     Checking rascal_compiler v0.1.2
[INFO] [stderr]     Checking rascal_vm v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Chunk, CompilerError>
[INFO] [stdout]   --> src/vm.rs:42:22
[INFO] [stdout]    |
[INFO] [stdout] 42 |         self.chunk = compile(ast).map_err(|e| InterpreterError::Compile(e))?;
[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 `rascal_vm` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<Chunk, CompilerError>
[INFO] [stdout]   --> src/vm.rs:42:22
[INFO] [stdout]    |
[INFO] [stdout] 42 |         self.chunk = compile(ast).map_err(|e| InterpreterError::Compile(e))?;
[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 `rascal_vm` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "e78decb7cfbe9e4b9dae99fdc85ca6d407746c70a36428fa0ced1e49274eb4b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e78decb7cfbe9e4b9dae99fdc85ca6d407746c70a36428fa0ced1e49274eb4b0", kill_on_drop: false }`
[INFO] [stdout] e78decb7cfbe9e4b9dae99fdc85ca6d407746c70a36428fa0ced1e49274eb4b0