[INFO] cloning repository https://github.com/ghimiresdp/rust-challenges
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ghimiresdp/rust-challenges" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghimiresdp%2Frust-challenges", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghimiresdp%2Frust-challenges'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0ba0024927f81bc857d677a88e7cad1c34ef3799
[INFO] checking ghimiresdp/rust-challenges against master#01706e1a34c87656fcbfce198608f4cd2ac6461a for pr-135272
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghimiresdp%2Frust-challenges" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ghimiresdp/rust-challenges on toolchain 01706e1a34c87656fcbfce198608f4cd2ac6461a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+01706e1a34c87656fcbfce198608f4cd2ac6461a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ghimiresdp/rust-challenges
[INFO] finished tweaking git repo https://github.com/ghimiresdp/rust-challenges
[INFO] tweaked toml for git repo https://github.com/ghimiresdp/rust-challenges written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ghimiresdp/rust-challenges already has a lockfile, it will not be regenerated
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[INFO] [stdout] e1a870e1f0666ca7ce67503417af473a4ac46788f024efcc02e4512502f240bb
[INFO] running `Command { std: "docker" "start" "-a" "e1a870e1f0666ca7ce67503417af473a4ac46788f024efcc02e4512502f240bb", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "rm" "-f" "e1a870e1f0666ca7ce67503417af473a4ac46788f024efcc02e4512502f240bb", kill_on_drop: false }`
[INFO] [stdout] e1a870e1f0666ca7ce67503417af473a4ac46788f024efcc02e4512502f240bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "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@sha256:819108c5571ea2e421544af4d832f968d213c87fbe3707a016657f43d2f853bc" "/opt/rustwide/cargo-home/bin/cargo" "+01706e1a34c87656fcbfce198608f4cd2ac6461a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: function pointer comparisons do not produce meaningful results since their addresses are not guaranteed to be unique
[INFO] [stdout]   --> design-patterns/src/observer.rs:52:26
[INFO] [stdout]    |
[INFO] [stdout] 52 |             .retain(|&x| x != listener);
[INFO] [stdout]    |                          ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the address of the same function can vary between different codegen units
[INFO] [stdout]    = note: furthermore, different functions could have the same address after being merged together
[INFO] [stdout]    = note: for more information visit <https://doc.rust-lang.org/nightly/core/ptr/fn.fn_addr_eq.html>
[INFO] [stdout]    = note: `#[warn(unpredictable_function_pointer_comparisons)]` on by default
[INFO] [stdout] help: refactor your code, or use `std::ptr::fn_addr_eq` to suppress the lint
[INFO] [stdout]    |
[INFO] [stdout] 52 |             .retain(|&x| !std::ptr::fn_addr_eq(x, listener));
[INFO] [stdout]    |                          ++++++++++++++++++++++ ~         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function pointer comparisons do not produce meaningful results since their addresses are not guaranteed to be unique
[INFO] [stdout]   --> design-patterns/src/observer.rs:52:26
[INFO] [stdout]    |
[INFO] [stdout] 52 |             .retain(|&x| x != listener);
[INFO] [stdout]    |                          ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the address of the same function can vary between different codegen units
[INFO] [stdout]    = note: furthermore, different functions could have the same address after being merged together
[INFO] [stdout]    = note: for more information visit <https://doc.rust-lang.org/nightly/core/ptr/fn.fn_addr_eq.html>
[INFO] [stdout]    = note: `#[warn(unpredictable_function_pointer_comparisons)]` on by default
[INFO] [stdout] help: refactor your code, or use `std::ptr::fn_addr_eq` to suppress the lint
[INFO] [stdout]    |
[INFO] [stdout] 52 |             .retain(|&x| !std::ptr::fn_addr_eq(x, listener));
[INFO] [stdout]    |                          ++++++++++++++++++++++ ~         +
[INFO] [stdout] 
[INFO] [stdout] 
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[INFO] running `Command { std: "docker" "inspect" "947635c9ffda89791700a069074ac4fb0b02ec259e98d990f795a697300e7226", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "947635c9ffda89791700a069074ac4fb0b02ec259e98d990f795a697300e7226", kill_on_drop: false }`
[INFO] [stdout] 947635c9ffda89791700a069074ac4fb0b02ec259e98d990f795a697300e7226
