[INFO] fetching crate elrond-codec 0.16.0...
[INFO] checking elrond-codec-0.16.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate elrond-codec 0.16.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate elrond-codec 0.16.0
[INFO] finished tweaking crates.io crate elrond-codec 0.16.0
[INFO] tweaked toml for crates.io crate elrond-codec 0.16.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate elrond-codec 0.16.0 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 18 packages to latest compatible versions
[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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] a43e6e5d5e3322ccac4d82e9d7741cbc90a0db1e3b5e05c192fc43b0965573c1
[INFO] running `Command { std: "docker" "start" "-a" "a43e6e5d5e3322ccac4d82e9d7741cbc90a0db1e3b5e05c192fc43b0965573c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a43e6e5d5e3322ccac4d82e9d7741cbc90a0db1e3b5e05c192fc43b0965573c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a43e6e5d5e3322ccac4d82e9d7741cbc90a0db1e3b5e05c192fc43b0965573c1", kill_on_drop: false }`
[INFO] [stdout] a43e6e5d5e3322ccac4d82e9d7741cbc90a0db1e3b5e05c192fc43b0965573c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 3a1f3f36451d260f8dbfa85136189ef5f70f72d998249be1433dbe156aeb964a
[INFO] running `Command { std: "docker" "start" "-a" "3a1f3f36451d260f8dbfa85136189ef5f70f72d998249be1433dbe156aeb964a", kill_on_drop: false }`
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]     Checking memory_units v0.4.0
[INFO] [stderr]    Compiling elrond-codec-derive v0.16.0
[INFO] [stderr]     Checking elrond-codec v0.16.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `simple_function` is never used
[INFO] [stdout]   --> tests/derive_struct_with_generic_test.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | trait SimpleTrait {
[INFO] [stdout]    |       ----------- method in this trait
[INFO] [stdout] 13 |     fn simple_function(&self);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<ArrayVec<i32, 2>, !>
[INFO] [stdout]    --> src/impl_for_types/impl_array_vec.rs:105:17
[INFO] [stdout]     |
[INFO] [stdout] 105 |         let _ = <ArrayVec<i32, 2>>::top_decode_or_handle_err(TOP_BYTES, PanicErrorHandler);
[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<Option<ArrayVec<i32, 2>>, !>
[INFO] [stdout]    --> src/impl_for_types/impl_array_vec.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |             Option::<ArrayVec<i32, 2>>::top_decode_or_handle_err(NESTED_BYTES, PanicErrorHandler);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `elrond-codec` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "3a1f3f36451d260f8dbfa85136189ef5f70f72d998249be1433dbe156aeb964a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a1f3f36451d260f8dbfa85136189ef5f70f72d998249be1433dbe156aeb964a", kill_on_drop: false }`
[INFO] [stdout] 3a1f3f36451d260f8dbfa85136189ef5f70f72d998249be1433dbe156aeb964a