[INFO] fetching crate discard 1.0.4...
[INFO] testing discard-1.0.4 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] extracting crate discard 1.0.4 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate discard 1.0.4 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate discard 1.0.4
[INFO] finished tweaking crates.io crate discard 1.0.4
[INFO] tweaked toml for crates.io crate discard 1.0.4 written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47268e85fcabb46edf919d81081fdc83deaf0c2d029077e904b26cd32ee26a9c
[INFO] running `Command { std: "docker" "start" "-a" "47268e85fcabb46edf919d81081fdc83deaf0c2d029077e904b26cd32ee26a9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47268e85fcabb46edf919d81081fdc83deaf0c2d029077e904b26cd32ee26a9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47268e85fcabb46edf919d81081fdc83deaf0c2d029077e904b26cd32ee26a9c", kill_on_drop: false }`
[INFO] [stdout] 47268e85fcabb46edf919d81081fdc83deaf0c2d029077e904b26cd32ee26a9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb761fd32637e3ead1247b6bfde3473582f8c7eefc738582b562fc5256ff64b0
[INFO] running `Command { std: "docker" "start" "-a" "fb761fd32637e3ead1247b6bfde3473582f8c7eefc738582b562fc5256ff64b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling discard v1.0.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "fb761fd32637e3ead1247b6bfde3473582f8c7eefc738582b562fc5256ff64b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb761fd32637e3ead1247b6bfde3473582f8c7eefc738582b562fc5256ff64b0", kill_on_drop: false }`
[INFO] [stdout] fb761fd32637e3ead1247b6bfde3473582f8c7eefc738582b562fc5256ff64b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d7055ed6fb9f5a41b0004e021e4432b4a6960db2ec4a4b4530fbe54bf7cd60b1
[INFO] running `Command { std: "docker" "start" "-a" "d7055ed6fb9f5a41b0004e021e4432b4a6960db2ec4a4b4530fbe54bf7cd60b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling discard v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `DiscardOnDrop` that must be used
[INFO] [stdout]    --> src/lib.rs:261:9
[INFO] [stdout]     |
[INFO] [stdout] 261 |         DiscardOnDrop::new(Foo::new());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: 
[INFO] [stdout]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
[INFO] [stdout]             You probably don't want that to happen.
[INFO] [stdout]             
[INFO] [stdout]             How to fix this:
[INFO] [stdout]             
[INFO] [stdout]               * Store the DiscardOnDrop in a variable or data structure.
[INFO] [stdout]             
[INFO] [stdout]               * Or use the DiscardOnDrop::leak function which will cause it to not be
[INFO] [stdout]                 discarded (this *will* leak memory!).
[INFO] [stdout]             
[INFO] [stdout]             See the DiscardOnDrop documentation for more details.
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `DiscardOnDrop` that must be used
[INFO] [stdout]    --> src/lib.rs:262:9
[INFO] [stdout]     |
[INFO] [stdout] 262 |         DiscardOnDrop::new(Foo::new());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: 
[INFO] [stdout]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
[INFO] [stdout]             You probably don't want that to happen.
[INFO] [stdout]             
[INFO] [stdout]             How to fix this:
[INFO] [stdout]             
[INFO] [stdout]               * Store the DiscardOnDrop in a variable or data structure.
[INFO] [stdout]             
[INFO] [stdout]               * Or use the DiscardOnDrop::leak function which will cause it to not be
[INFO] [stdout]                 discarded (this *will* leak memory!).
[INFO] [stdout]             
[INFO] [stdout]             See the DiscardOnDrop documentation for more details.
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "d7055ed6fb9f5a41b0004e021e4432b4a6960db2ec4a4b4530fbe54bf7cd60b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7055ed6fb9f5a41b0004e021e4432b4a6960db2ec4a4b4530fbe54bf7cd60b1", kill_on_drop: false }`
[INFO] [stdout] d7055ed6fb9f5a41b0004e021e4432b4a6960db2ec4a4b4530fbe54bf7cd60b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6053e382ff1d238ff4952a72a975aeb980e42005f51081348b1c3f5d6d6bb5c0
[INFO] running `Command { std: "docker" "start" "-a" "6053e382ff1d238ff4952a72a975aeb980e42005f51081348b1c3f5d6d6bb5c0", kill_on_drop: false }`
[INFO] [stderr] warning: unused `DiscardOnDrop` that must be used
[INFO] [stderr]    --> src/lib.rs:261:9
[INFO] [stderr]     |
[INFO] [stderr] 261 |         DiscardOnDrop::new(Foo::new());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: 
[INFO] [stderr]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
[INFO] [stderr]             You probably don't want that to happen.
[INFO] [stderr]             
[INFO] [stderr]             How to fix this:
[INFO] [stderr]             
[INFO] [stderr]               * Store the DiscardOnDrop in a variable or data structure.
[INFO] [stderr]             
[INFO] [stderr]               * Or use the DiscardOnDrop::leak function which will cause it to not be
[INFO] [stderr]                 discarded (this *will* leak memory!).
[INFO] [stderr]             
[INFO] [stderr]             See the DiscardOnDrop documentation for more details.
[INFO] [stderr] 
[INFO] [stderr] warning: unused `DiscardOnDrop` that must be used
[INFO] [stderr]    --> src/lib.rs:262:9
[INFO] [stderr]     |
[INFO] [stderr] 262 |         DiscardOnDrop::new(Foo::new());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: 
[INFO] [stderr]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
[INFO] [stderr]             You probably don't want that to happen.
[INFO] [stderr]             
[INFO] [stderr]             How to fix this:
[INFO] [stderr]             
[INFO] [stderr]               * Store the DiscardOnDrop in a variable or data structure.
[INFO] [stderr]             
[INFO] [stderr]               * Or use the DiscardOnDrop::leak function which will cause it to not be
[INFO] [stderr]                 discarded (this *will* leak memory!).
[INFO] [stderr]             
[INFO] [stderr]             See the DiscardOnDrop documentation for more details.
[INFO] [stderr] 
[INFO] [stderr] warning: `discard` (lib test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/discard-02d93fb86ba3bff7)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::deref_mut ... ok
[INFO] [stdout] test tests::discard ... ok
[INFO] [stdout] test tests::discard_on_drop ... ok
[INFO] [stderr]    Doc-tests discard
[INFO] [stdout] test tests::leak ... ok
[INFO] [stdout] test tests::no_discard ... ok
[INFO] [stdout] test tests::unused ... ok
[INFO] [stdout] test tests::unused_discard_on_drop ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - (line 15) ... ignored
[INFO] [stdout] test src/lib.rs - (line 30) ... ignored
[INFO] [stdout] test src/lib.rs - (line 61) ... ignored
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 3 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6053e382ff1d238ff4952a72a975aeb980e42005f51081348b1c3f5d6d6bb5c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6053e382ff1d238ff4952a72a975aeb980e42005f51081348b1c3f5d6d6bb5c0", kill_on_drop: false }`
[INFO] [stdout] 6053e382ff1d238ff4952a72a975aeb980e42005f51081348b1c3f5d6d6bb5c0