[INFO] fetching crate msgpackin 0.0.4...
[INFO] testing msgpackin-0.0.4 against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] extracting crate msgpackin 0.0.4 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate msgpackin 0.0.4
[INFO] finished tweaking crates.io crate msgpackin 0.0.4
[INFO] tweaked toml for crates.io crate msgpackin 0.0.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate msgpackin 0.0.4 on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 39 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded msgpackin_core v0.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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_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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7d2b6e44d50e142bb96617f7bcfb1fd6aa1e278f922ad577689fd9b37be024f
[INFO] running `Command { std: "docker" "start" "-a" "a7d2b6e44d50e142bb96617f7bcfb1fd6aa1e278f922ad577689fd9b37be024f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7d2b6e44d50e142bb96617f7bcfb1fd6aa1e278f922ad577689fd9b37be024f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7d2b6e44d50e142bb96617f7bcfb1fd6aa1e278f922ad577689fd9b37be024f", kill_on_drop: false }`
[INFO] [stdout] a7d2b6e44d50e142bb96617f7bcfb1fd6aa1e278f922ad577689fd9b37be024f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 3e73c56728c3d8d5b8e7dea08462d035c970b9cfa28c3c2c2eef2e6e880c9ced
[INFO] running `Command { std: "docker" "start" "-a" "3e73c56728c3d8d5b8e7dea08462d035c970b9cfa28c3c2c2eef2e6e880c9ced", kill_on_drop: false }`
[INFO] [stderr]    Compiling msgpackin_core v0.0.4
[INFO] [stderr]    Compiling msgpackin v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: unused import: `self::core::iter`
[INFO] [stdout]    --> src/lib.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 153 |     pub use self::core::iter;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 132 | #![deny(warnings)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_imports)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: trait `Error` is never used
[INFO] [stdout]    --> src/lib.rs:185:15
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub trait Error: fmt::Debug + fmt::Display {
[INFO] [stdout]     |               ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(dead_code)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/value.rs:116:19
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub fn as_ref(&self) -> Utf8StrRef {
[INFO] [stdout]     |                   ^^^^^     ---------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(mismatched_lifetime_syntaxes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub fn as_ref(&self) -> Utf8StrRef<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/value.rs:427:19
[INFO] [stdout]     |
[INFO] [stdout] 427 |     pub fn as_ref(&self) -> ValueRef {
[INFO] [stdout]     |                   ^^^^^     -------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 427 |     pub fn as_ref(&self) -> ValueRef<'_> {
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `msgpackin` (lib) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "3e73c56728c3d8d5b8e7dea08462d035c970b9cfa28c3c2c2eef2e6e880c9ced", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e73c56728c3d8d5b8e7dea08462d035c970b9cfa28c3c2c2eef2e6e880c9ced", kill_on_drop: false }`
[INFO] [stdout] 3e73c56728c3d8d5b8e7dea08462d035c970b9cfa28c3c2c2eef2e6e880c9ced