[INFO] fetching crate rmp 0.8.14...
[INFO] checking rmp-0.8.14 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate rmp 0.8.14 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate rmp 0.8.14
[INFO] finished tweaking crates.io crate rmp 0.8.14
[INFO] tweaked toml for crates.io crate rmp 0.8.14 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rmp 0.8.14 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] crate crates.io crate rmp 0.8.14 already has a lockfile, it will not be regenerated
[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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 3fa5228509ba46c20ed9eeeb6b12f3ba82736c8a37ee5d3c5419312b53c8f922
[INFO] running `Command { std: "docker" "start" "-a" "3fa5228509ba46c20ed9eeeb6b12f3ba82736c8a37ee5d3c5419312b53c8f922", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fa5228509ba46c20ed9eeeb6b12f3ba82736c8a37ee5d3c5419312b53c8f922", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fa5228509ba46c20ed9eeeb6b12f3ba82736c8a37ee5d3c5419312b53c8f922", kill_on_drop: false }`
[INFO] [stdout] 3fa5228509ba46c20ed9eeeb6b12f3ba82736c8a37ee5d3c5419312b53c8f922
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] fc4f0693e61d5fde541b419204f6a156029169e11486d27c0734ed156f5e9f16
[INFO] running `Command { std: "docker" "start" "-a" "fc4f0693e61d5fde541b419204f6a156029169e11486d27c0734ed156f5e9f16", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]     Checking regex-syntax v0.8.3
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking getrandom v0.2.14
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rmp v0.8.14 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stdout] warning: struct `MarkerWriteError` is never constructed
[INFO] [stdout]    --> src/decode/mod.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | struct MarkerWriteError<E: RmpReadErr>(E);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking quickcheck v1.0.3
[INFO] [stdout] warning: struct `MarkerWriteError` is never constructed
[INFO] [stdout]    --> src/decode/mod.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | struct MarkerWriteError<E: RmpReadErr>(E);
[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<Marker, ValueWriteError<Infallible>>
[INFO] [stdout]  --> tests/func/mirror.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         encode::write_uint(&mut buf, xs).unwrap();
[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<Marker, ValueWriteError<Infallible>>
[INFO] [stdout]   --> tests/func/mirror.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         encode::write_sint(&mut buf, xs).unwrap();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rmp` (test "lib") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "fc4f0693e61d5fde541b419204f6a156029169e11486d27c0734ed156f5e9f16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc4f0693e61d5fde541b419204f6a156029169e11486d27c0734ed156f5e9f16", kill_on_drop: false }`
[INFO] [stdout] fc4f0693e61d5fde541b419204f6a156029169e11486d27c0734ed156f5e9f16