[INFO] fetching crate len-trait 0.6.1...
[INFO] testing len-trait-0.6.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate len-trait 0.6.1 into /workspace/builds/worker-76/source
[INFO] validating manifest of crates.io crate len-trait 0.6.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate len-trait 0.6.1
[INFO] finished tweaking crates.io crate len-trait 0.6.1
[INFO] tweaked toml for crates.io crate len-trait 0.6.1 written to /workspace/builds/worker-76/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1425d1bbbe74aa491dc0f1e8a6c526b88833f70f2a61ef300c650c3ab2044db
[INFO] running `Command { std: "docker" "start" "-a" "e1425d1bbbe74aa491dc0f1e8a6c526b88833f70f2a61ef300c650c3ab2044db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1425d1bbbe74aa491dc0f1e8a6c526b88833f70f2a61ef300c650c3ab2044db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1425d1bbbe74aa491dc0f1e8a6c526b88833f70f2a61ef300c650c3ab2044db", kill_on_drop: false }`
[INFO] [stdout] e1425d1bbbe74aa491dc0f1e8a6c526b88833f70f2a61ef300c650c3ab2044db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a49ef1a87f9fbff6a3050b272240855155e44eacd392f1ab6d18e54e8e6d8bc0
[INFO] running `Command { std: "docker" "start" "-a" "a49ef1a87f9fbff6a3050b272240855155e44eacd392f1ab6d18e54e8e6d8bc0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling len-trait v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/capacity.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if Len::is_empty(self) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if <dyn Len>::is_empty(self) {
[INFO] [stdout]     |            ++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.58s
[INFO] running `Command { std: "docker" "inspect" "a49ef1a87f9fbff6a3050b272240855155e44eacd392f1ab6d18e54e8e6d8bc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a49ef1a87f9fbff6a3050b272240855155e44eacd392f1ab6d18e54e8e6d8bc0", kill_on_drop: false }`
[INFO] [stdout] a49ef1a87f9fbff6a3050b272240855155e44eacd392f1ab6d18e54e8e6d8bc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54466b28c9f319afab06ff33b0b622cf37119daa3fede90c7b128abd8c01e9e4
[INFO] running `Command { std: "docker" "start" "-a" "54466b28c9f319afab06ff33b0b622cf37119daa3fede90c7b128abd8c01e9e4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling len-trait v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/capacity.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if Len::is_empty(self) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if <dyn Len>::is_empty(self) {
[INFO] [stdout]     |            ++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/capacity.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if Len::is_empty(self) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:76:24
[INFO] [stdout]     |
[INFO] [stdout] 76  | #![cfg_attr(test, deny(warnings))]
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` implied by `#[warn(warnings)]`
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 |         if <dyn Len>::is_empty(self) {
[INFO] [stdout]     |            ++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `Command { std: "docker" "inspect" "54466b28c9f319afab06ff33b0b622cf37119daa3fede90c7b128abd8c01e9e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54466b28c9f319afab06ff33b0b622cf37119daa3fede90c7b128abd8c01e9e4", kill_on_drop: false }`
[INFO] [stdout] 54466b28c9f319afab06ff33b0b622cf37119daa3fede90c7b128abd8c01e9e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f0f9aa7b733b2a2846f188462c9915b42c747e6a9559b7a1196a075f66428a90
[INFO] running `Command { std: "docker" "start" "-a" "f0f9aa7b733b2a2846f188462c9915b42c747e6a9559b7a1196a075f66428a90", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stdout] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout] running 0 tests
[INFO] [stderr]    --> src/capacity.rs:166:12
[INFO] [stdout] 
[INFO] [stderr]     |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 166 |         if Len::is_empty(self) {
[INFO] [stdout] 
[INFO] [stderr]     |            ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 166 |         if <dyn Len>::is_empty(self) {
[INFO] [stderr]     |            ++++    +
[INFO] [stderr] 
[INFO] [stderr] warning: `len-trait` (lib) generated 1 warning
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/capacity.rs:166:12
[INFO] [stderr]     |
[INFO] [stderr] 166 |         if Len::is_empty(self) {
[INFO] [stderr]     |            ^^^
[INFO] [stderr]     |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]    --> src/lib.rs:76:24
[INFO] [stderr]     |
[INFO] [stderr] 76  | #![cfg_attr(test, deny(warnings))]
[INFO] [stderr]     |                        ^^^^^^^^
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` implied by `#[warn(warnings)]`
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 166 |         if <dyn Len>::is_empty(self) {
[INFO] [stderr]     |            ++++    +
[INFO] [stderr] 
[INFO] [stderr] warning: `len-trait` (lib test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1m 27s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/len_trait-d3182209d51fcd22)
[INFO] [stderr]    Doc-tests len-trait
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test src/len.rs - len::Len::len (line 40) ... ok
[INFO] [stdout] test src/capacity.rs - capacity::Capacity::capacity (line 19) ... ok
[INFO] [stdout] test src/capacity.rs - capacity::CapacityMut::shrink_to_fit (line 150) ... ok
[INFO] [stdout] test src/capacity.rs - capacity::WithCapacity::with_capacity (line 57) ... ok
[INFO] [stdout] test src/len.rs - len::LenMut::split_off (line 127) ... ok
[INFO] [stdout] test src/len.rs - len::LenMut::truncate (line 101) ... ok
[INFO] [stdout] test src/len.rs - len::Clear::clear (line 64) ... ok
[INFO] [stdout] test src/len.rs - len::Empty::is_empty (line 11) ... ok
[INFO] [stdout] test src/capacity.rs - capacity::CapacityMut::reserve (line 93) ... ok
[INFO] [stdout] test src/capacity.rs - capacity::CapacityMut::reserve_exact (line 113) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.78s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f0f9aa7b733b2a2846f188462c9915b42c747e6a9559b7a1196a075f66428a90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0f9aa7b733b2a2846f188462c9915b42c747e6a9559b7a1196a075f66428a90", kill_on_drop: false }`
[INFO] [stdout] f0f9aa7b733b2a2846f188462c9915b42c747e6a9559b7a1196a075f66428a90