[INFO] fetching crate mamegrep 0.4.1...
[INFO] checking mamegrep-0.4.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mamegrep 0.4.1 into /workspace/builds/worker-0-tc2/source
[INFO] removed /workspace/builds/worker-0-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate mamegrep 0.4.1
[INFO] finished tweaking crates.io crate mamegrep 0.4.1
[INFO] tweaked toml for crates.io crate mamegrep 0.4.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mamegrep 0.4.1 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 crates.io crate mamegrep 0.4.1 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] ff82c271bb1ebd7e8e72acd99edaf3d4bd30f77f5e3bf4659b0654d8584f8393
[INFO] running `Command { std: "docker" "start" "-a" "ff82c271bb1ebd7e8e72acd99edaf3d4bd30f77f5e3bf4659b0654d8584f8393", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff82c271bb1ebd7e8e72acd99edaf3d4bd30f77f5e3bf4659b0654d8584f8393", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff82c271bb1ebd7e8e72acd99edaf3d4bd30f77f5e3bf4659b0654d8584f8393", kill_on_drop: false }`
[INFO] [stdout] ff82c271bb1ebd7e8e72acd99edaf3d4bd30f77f5e3bf4659b0654d8584f8393
[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] c7f8eb59d3fa963f5d88292066faac532e53882a31430f605457fb37c2862627
[INFO] running `Command { std: "docker" "start" "-a" "c7f8eb59d3fa963f5d88292066faac532e53882a31430f605457fb37c2862627", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.176
[INFO] [stderr]     Checking nojson v0.3.6
[INFO] [stderr]     Checking noargs v0.4.1
[INFO] [stderr]     Checking orfail v1.1.0
[INFO] [stderr]     Checking tuinix v0.3.2
[INFO] [stderr]     Checking mame v0.3.0
[INFO] [stderr]     Checking mamegrep v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:33:31
[INFO] [stdout]    |
[INFO] [stdout] 33 |         .present_and_then(|a| a.value().parse())?;
[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, Infallible>
[INFO] [stdout]   --> src/main.rs:40:31
[INFO] [stdout]    |
[INFO] [stdout] 40 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:47:31
[INFO] [stdout]    |
[INFO] [stdout] 47 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:54:31
[INFO] [stdout]    |
[INFO] [stdout] 54 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:61:31
[INFO] [stdout]    |
[INFO] [stdout] 61 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:66:31
[INFO] [stdout]    |
[INFO] [stdout] 66 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mamegrep` (bin "mamegrep" test) due to 6 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/main.rs:33:31
[INFO] [stdout]    |
[INFO] [stdout] 33 |         .present_and_then(|a| a.value().parse())?;
[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, Infallible>
[INFO] [stdout]   --> src/main.rs:40:31
[INFO] [stdout]    |
[INFO] [stdout] 40 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:47:31
[INFO] [stdout]    |
[INFO] [stdout] 47 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:54:31
[INFO] [stdout]    |
[INFO] [stdout] 54 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:61:31
[INFO] [stdout]    |
[INFO] [stdout] 61 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:66:31
[INFO] [stdout]    |
[INFO] [stdout] 66 |         .present_and_then(|a| a.value().parse())?
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mamegrep` (bin "mamegrep") due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "c7f8eb59d3fa963f5d88292066faac532e53882a31430f605457fb37c2862627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7f8eb59d3fa963f5d88292066faac532e53882a31430f605457fb37c2862627", kill_on_drop: false }`
[INFO] [stdout] c7f8eb59d3fa963f5d88292066faac532e53882a31430f605457fb37c2862627
