[INFO] fetching crate synstructure_test_traits 0.1.0...
[INFO] checking synstructure_test_traits-0.1.0 against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] extracting crate synstructure_test_traits 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate synstructure_test_traits 0.1.0 on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate synstructure_test_traits 0.1.0
[INFO] finished tweaking crates.io crate synstructure_test_traits 0.1.0
[INFO] tweaked toml for crates.io crate synstructure_test_traits 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "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" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0176c6949f30bd9d659aee8e10cf4a6709cec019f26c23cb3085f47c7ff38516
[INFO] running `Command { std: "docker" "start" "-a" "0176c6949f30bd9d659aee8e10cf4a6709cec019f26c23cb3085f47c7ff38516", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0176c6949f30bd9d659aee8e10cf4a6709cec019f26c23cb3085f47c7ff38516", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0176c6949f30bd9d659aee8e10cf4a6709cec019f26c23cb3085f47c7ff38516", kill_on_drop: false }`
[INFO] [stdout] 0176c6949f30bd9d659aee8e10cf4a6709cec019f26c23cb3085f47c7ff38516
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3c9b7f5b1c65d1c1057dbc36c77d7bbf22b96005cc740a6969e45a92585f89d
[INFO] running `Command { std: "docker" "start" "-a" "c3c9b7f5b1c65d1c1057dbc36c77d7bbf22b96005cc740a6969e45a92585f89d", kill_on_drop: false }`
[INFO] [stderr]     Checking synstructure_test_traits v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> lib.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn walk_fields(&self, walk: &mut FnMut(&WalkFields));
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&WalkFields)`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> lib.rs:7:45
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn walk_fields(&self, walk: &mut FnMut(&WalkFields));
[INFO] [stdout]   |                                             ^^^^^^^^^^ help: use `dyn`: `dyn WalkFields`
[INFO] [stdout]   |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> lib.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn walk_fields(&self, _walk: &mut FnMut(&WalkFields)) {}
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&WalkFields)`
[INFO] [stdout]    |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> lib.rs:10:46
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn walk_fields(&self, _walk: &mut FnMut(&WalkFields)) {}
[INFO] [stdout]    |                                              ^^^^^^^^^^ help: use `dyn`: `dyn WalkFields`
[INFO] [stdout]    |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> lib.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn walk_fields(&self, walk: &mut FnMut(&WalkFields));
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&WalkFields)`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> lib.rs:7:45
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn walk_fields(&self, walk: &mut FnMut(&WalkFields));
[INFO] [stdout]   |                                             ^^^^^^^^^^ help: use `dyn`: `dyn WalkFields`
[INFO] [stdout]   |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> lib.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn walk_fields(&self, _walk: &mut FnMut(&WalkFields)) {}
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&WalkFields)`
[INFO] [stdout]    |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> lib.rs:10:46
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn walk_fields(&self, _walk: &mut FnMut(&WalkFields)) {}
[INFO] [stdout]    |                                              ^^^^^^^^^^ help: use `dyn`: `dyn WalkFields`
[INFO] [stdout]    |
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "c3c9b7f5b1c65d1c1057dbc36c77d7bbf22b96005cc740a6969e45a92585f89d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3c9b7f5b1c65d1c1057dbc36c77d7bbf22b96005cc740a6969e45a92585f89d", kill_on_drop: false }`
[INFO] [stdout] c3c9b7f5b1c65d1c1057dbc36c77d7bbf22b96005cc740a6969e45a92585f89d