[INFO] fetching crate imm_gc 0.2.1...
[INFO] testing imm_gc-0.2.1 against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] extracting crate imm_gc 0.2.1 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate imm_gc 0.2.1 on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate imm_gc 0.2.1
[INFO] finished tweaking crates.io crate imm_gc 0.2.1
[INFO] tweaked toml for crates.io crate imm_gc 0.2.1 written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded imm_gc_derive v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d0702d632e1227bc671c2d057c6890f34b102ca129025ffc7327f5aed3b11dd6
[INFO] running `Command { std: "docker" "start" "-a" "d0702d632e1227bc671c2d057c6890f34b102ca129025ffc7327f5aed3b11dd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0702d632e1227bc671c2d057c6890f34b102ca129025ffc7327f5aed3b11dd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0702d632e1227bc671c2d057c6890f34b102ca129025ffc7327f5aed3b11dd6", kill_on_drop: false }`
[INFO] [stdout] d0702d632e1227bc671c2d057c6890f34b102ca129025ffc7327f5aed3b11dd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d14a132ca8d45b0cf8f5d41f1d0c66fb0b9fa121da18aa87940e543bf667428a
[INFO] running `Command { std: "docker" "start" "-a" "d14a132ca8d45b0cf8f5d41f1d0c66fb0b9fa121da18aa87940e543bf667428a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling imm_gc v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.91s
[INFO] running `Command { std: "docker" "inspect" "d14a132ca8d45b0cf8f5d41f1d0c66fb0b9fa121da18aa87940e543bf667428a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d14a132ca8d45b0cf8f5d41f1d0c66fb0b9fa121da18aa87940e543bf667428a", kill_on_drop: false }`
[INFO] [stdout] d14a132ca8d45b0cf8f5d41f1d0c66fb0b9fa121da18aa87940e543bf667428a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e74df508d440d4fc75d0137c19adc5a72edf5148d0002ed084ba8525b11311ba
[INFO] running `Command { std: "docker" "start" "-a" "e74df508d440d4fc75d0137c19adc5a72edf5148d0002ed084ba8525b11311ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling imm_gc v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.01s
[INFO] running `Command { std: "docker" "inspect" "e74df508d440d4fc75d0137c19adc5a72edf5148d0002ed084ba8525b11311ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e74df508d440d4fc75d0137c19adc5a72edf5148d0002ed084ba8525b11311ba", kill_on_drop: false }`
[INFO] [stdout] e74df508d440d4fc75d0137c19adc5a72edf5148d0002ed084ba8525b11311ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4e0efc82bf91396131e38cb15a9add7618033f66be014a444df1bc9e83bf091a
[INFO] running `Command { std: "docker" "start" "-a" "4e0efc82bf91396131e38cb15a9add7618033f66be014a444df1bc9e83bf091a", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/imm_gc-3aeb1379ac3467a7)
[INFO] [stdout] running 2 tests
[INFO] [stderr]    Doc-tests imm_gc
[INFO] [stdout] test tests::test_better_cyclic::test_better_cyclic ... ok
[INFO] [stdout] test tests::test_simple_cyclic::test_simple_cyclic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test src/lib.rs - Gc<T>::drop (line 445) ... FAILED
[INFO] [stdout] test src/lib.rs - Gc<T>::new_cyclic (line 118) ... FAILED
[INFO] [stdout] test src/lib.rs - unsafe_empty_trace (line 737) ... FAILED
[INFO] [stdout] test src/lib.rs - Gc<T>::new_cyclic (line 138) ... ok
[INFO] [stdout] test src/lib.rs - Gc<T>::get_mut (line 272) ... ok
[INFO] [stdout] test src/lib.rs - Gc<T>::deref (line 339) ... FAILED
[INFO] [stdout] test src/lib.rs - unsafe_empty_trace (line 724) ... ok
[INFO] [stdout] test src/lib.rs - Gc<T>::new (line 92) ... ok
[INFO] [stdout] test src/lib.rs - Gc<T>::try_unwrap (line 214) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - Gc<T>::drop (line 445) stdout ----
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> src/lib.rs:448:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Trace)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> src/lib.rs:446:18
[INFO] [stdout]   |
[INFO] [stdout] 4 | use imm_gc::{Gc, Trace};
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Cyclic: Trace` is not satisfied
[INFO] [stdout]   --> src/lib.rs:449:15
[INFO] [stdout]    |
[INFO] [stdout] 7  | struct Cyclic(Gc<Cyclic>);
[INFO] [stdout]    |               ^^^^^^^^^^ the trait `Trace` is not implemented for `Cyclic`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `Gc`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:43:18
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Gc<T: Trace> {
[INFO] [stdout]    |                  ^^^^^ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - Gc<T>::new_cyclic (line 118) stdout ----
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> src/lib.rs:121:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Trace)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> src/lib.rs:119:18
[INFO] [stdout]   |
[INFO] [stdout] 4 | use imm_gc::{Gc, Trace};
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Gadget: Trace` is not satisfied
[INFO] [stdout]   --> src/lib.rs:128:17
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn new() -> Gc<Self> {
[INFO] [stdout]    |                 ^^^^^^^^ the trait `Trace` is not implemented for `Gadget`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `Gc`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:43:18
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Gc<T: Trace> {
[INFO] [stdout]    |                  ^^^^^ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Gadget: Trace` is not satisfied
[INFO] [stdout]   --> src/lib.rs:123:14
[INFO] [stdout]    |
[INFO] [stdout] 8  |     self_gc: Gc<Gadget>,
[INFO] [stdout]    |              ^^^^^^^^^^ the trait `Trace` is not implemented for `Gadget`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `Gc`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:43:18
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Gc<T: Trace> {
[INFO] [stdout]    |                  ^^^^^ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - unsafe_empty_trace (line 737) stdout ----
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> src/lib.rs:740:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Trace)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> src/lib.rs:738:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use imm_gc::Trace;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - Gc<T>::deref (line 339) stdout ----
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> src/lib.rs:342:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Trace)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> src/lib.rs:340:18
[INFO] [stdout]   |
[INFO] [stdout] 4 | use imm_gc::{Gc, Trace};
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Cyclic: Trace` is not satisfied
[INFO] [stdout]   --> src/lib.rs:343:15
[INFO] [stdout]    |
[INFO] [stdout] 7  | struct Cyclic(Gc<Cyclic>);
[INFO] [stdout]    |               ^^^^^^^^^^ the trait `Trace` is not implemented for `Cyclic`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `Gc`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:43:18
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Gc<T: Trace> {
[INFO] [stdout]    |                  ^^^^^ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - Gc<T>::deref (line 339)
[INFO] [stdout]     src/lib.rs - Gc<T>::drop (line 445)
[INFO] [stdout]     src/lib.rs - Gc<T>::new_cyclic (line 118)
[INFO] [stdout]     src/lib.rs - unsafe_empty_trace (line 737)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 5 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.07s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "4e0efc82bf91396131e38cb15a9add7618033f66be014a444df1bc9e83bf091a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e0efc82bf91396131e38cb15a9add7618033f66be014a444df1bc9e83bf091a", kill_on_drop: false }`
[INFO] [stdout] 4e0efc82bf91396131e38cb15a9add7618033f66be014a444df1bc9e83bf091a