[INFO] fetching crate msgpackin 0.0.4...
[INFO] building msgpackin-0.0.4 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate msgpackin 0.0.4 into /workspace/builds/worker-6-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-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate msgpackin 0.0.4 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 46 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "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-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_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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0acb64b6ee6ad9a2c5eb0d7c65fee34eae8e832eb0d018f555c48cbfe77d80f9
[INFO] running `Command { std: "docker" "start" "-a" "0acb64b6ee6ad9a2c5eb0d7c65fee34eae8e832eb0d018f555c48cbfe77d80f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0acb64b6ee6ad9a2c5eb0d7c65fee34eae8e832eb0d018f555c48cbfe77d80f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0acb64b6ee6ad9a2c5eb0d7c65fee34eae8e832eb0d018f555c48cbfe77d80f9", kill_on_drop: false }`
[INFO] [stdout] 0acb64b6ee6ad9a2c5eb0d7c65fee34eae8e832eb0d018f555c48cbfe77d80f9
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95bc0e5f4ee41870e1d81132965e936953378ac4869645c160926cdb70724cc7
[INFO] running `Command { std: "docker" "start" "-a" "95bc0e5f4ee41870e1d81132965e936953378ac4869645c160926cdb70724cc7", 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: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/value.rs:116:19
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub fn as_ref(&self) -> Utf8StrRef {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[deny(mismatched_lifetime_syntaxes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub fn as_ref(&self) -> Utf8StrRef<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/value.rs:427:19
[INFO] [stdout]     |
[INFO] [stdout] 427 |     pub fn as_ref(&self) -> ValueRef {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type 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" "95bc0e5f4ee41870e1d81132965e936953378ac4869645c160926cdb70724cc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95bc0e5f4ee41870e1d81132965e936953378ac4869645c160926cdb70724cc7", kill_on_drop: false }`
[INFO] [stdout] 95bc0e5f4ee41870e1d81132965e936953378ac4869645c160926cdb70724cc7