[INFO] fetching crate microserde 0.1.13...
[INFO] checking microserde-0.1.13 against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] extracting crate microserde 0.1.13 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate microserde 0.1.13 on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate microserde 0.1.13
[INFO] finished tweaking crates.io crate microserde 0.1.13
[INFO] tweaked toml for crates.io crate microserde 0.1.13 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6dd08e773b266eabe9379968dc42dec4574aa7f9dfe316affca7786c6aeae1e5
[INFO] running `Command { std: "docker" "start" "-a" "6dd08e773b266eabe9379968dc42dec4574aa7f9dfe316affca7786c6aeae1e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6dd08e773b266eabe9379968dc42dec4574aa7f9dfe316affca7786c6aeae1e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd08e773b266eabe9379968dc42dec4574aa7f9dfe316affca7786c6aeae1e5", kill_on_drop: false }`
[INFO] [stdout] 6dd08e773b266eabe9379968dc42dec4574aa7f9dfe316affca7786c6aeae1e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e4d27965e7bc83ae0ec26f05bd211983b7f3c3f21c99bd8ed4f2f6fa10c4bc6e
[INFO] running `Command { std: "docker" "start" "-a" "e4d27965e7bc83ae0ec26f05bd211983b7f3c3f21c99bd8ed4f2f6fa10c4bc6e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling microserde-derive v0.1.13
[INFO] [stderr]    Compiling automod v1.0.0
[INFO] [stderr]     Checking microserde v0.1.13 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ignore.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 48 |         Ok(Visitor::ignore())
[INFO] [stdout]    |            ^^^^^^^ help: use `dyn`: `<dyn Visitor>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ignore.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Ok(Visitor::ignore())
[INFO] [stdout]    |            ^^^^^^^ help: use `dyn`: `<dyn Visitor>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ignore.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 48 |         Ok(Visitor::ignore())
[INFO] [stdout]    |            ^^^^^^^ help: use `dyn`: `<dyn Visitor>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ignore.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Ok(Visitor::ignore())
[INFO] [stdout]    |            ^^^^^^^ help: use `dyn`: `<dyn Visitor>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.70s
[INFO] running `Command { std: "docker" "inspect" "e4d27965e7bc83ae0ec26f05bd211983b7f3c3f21c99bd8ed4f2f6fa10c4bc6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4d27965e7bc83ae0ec26f05bd211983b7f3c3f21c99bd8ed4f2f6fa10c4bc6e", kill_on_drop: false }`
[INFO] [stdout] e4d27965e7bc83ae0ec26f05bd211983b7f3c3f21c99bd8ed4f2f6fa10c4bc6e