[INFO] fetching crate env-extractor 0.0.7...
[INFO] checking env-extractor-0.0.7 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate env-extractor 0.0.7 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate env-extractor 0.0.7
[INFO] finished tweaking crates.io crate env-extractor 0.0.7
[INFO] tweaked toml for crates.io crate env-extractor 0.0.7 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate env-extractor 0.0.7 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] 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] 746d3eda2a712de0f87c22e9d5d80fd4d38049f1976c2c1df9625a1c6b476b11
[INFO] running `Command { std: "docker" "start" "-a" "746d3eda2a712de0f87c22e9d5d80fd4d38049f1976c2c1df9625a1c6b476b11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "746d3eda2a712de0f87c22e9d5d80fd4d38049f1976c2c1df9625a1c6b476b11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "746d3eda2a712de0f87c22e9d5d80fd4d38049f1976c2c1df9625a1c6b476b11", kill_on_drop: false }`
[INFO] [stdout] 746d3eda2a712de0f87c22e9d5d80fd4d38049f1976c2c1df9625a1c6b476b11
[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] af18415b051f7247de935c1dedc526a13b699fcaa1224ff7a9edc2717a1ba797
[INFO] running `Command { std: "docker" "start" "-a" "af18415b051f7247de935c1dedc526a13b699fcaa1224ff7a9edc2717a1ba797", kill_on_drop: false }`
[INFO] [stderr]     Checking env-extractor v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<test_optional::Sample, Infallible>
[INFO] [stdout]   --> src/lib.rs:50:61
[INFO] [stdout]    |
[INFO] [stdout] 50 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]    |  _____________________________________________________________^
[INFO] [stdout] 51 | |                 Ok(Sample {
[INFO] [stdout] 52 | |                     x: Some(s.to_string()),
[INFO] [stdout] 53 | |                 })
[INFO] [stdout] 54 | |             }
[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: std::result::Result<test_optional::Sample, Infallible>
[INFO] [stdout]   --> src/lib.rs:51:17
[INFO] [stdout]    |
[INFO] [stdout] 51 | /                 Ok(Sample {
[INFO] [stdout] 52 | |                     x: Some(s.to_string()),
[INFO] [stdout] 53 | |                 })
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<test_required::Sample, Infallible>
[INFO] [stdout]   --> src/lib.rs:95:61
[INFO] [stdout]    |
[INFO] [stdout] 95 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]    |  _____________________________________________________________^
[INFO] [stdout] 96 | |                 Ok(Sample { x: s.to_string() })
[INFO] [stdout] 97 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<test_required::Sample, Infallible>
[INFO] [stdout]   --> src/lib.rs:96:17
[INFO] [stdout]    |
[INFO] [stdout] 96 |                 Ok(Sample { x: s.to_string() })
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `env-extractor` (lib test) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "af18415b051f7247de935c1dedc526a13b699fcaa1224ff7a9edc2717a1ba797", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af18415b051f7247de935c1dedc526a13b699fcaa1224ff7a9edc2717a1ba797", kill_on_drop: false }`
[INFO] [stdout] af18415b051f7247de935c1dedc526a13b699fcaa1224ff7a9edc2717a1ba797