[INFO] fetching crate zerogc-simple 0.2.0-alpha.2...
[INFO] checking zerogc-simple-0.2.0-alpha.2 against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] extracting crate zerogc-simple 0.2.0-alpha.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate zerogc-simple 0.2.0-alpha.2 on toolchain 6f8a6450478f69b8510c8976ab6c2a70b3b0e47c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zerogc-simple 0.2.0-alpha.2
[INFO] finished tweaking crates.io crate zerogc-simple 0.2.0-alpha.2
[INFO] tweaked toml for crates.io crate zerogc-simple 0.2.0-alpha.2 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate zerogc-simple 0.2.0-alpha.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "fetch" "--locked" "--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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fc11dba33e335d98d80769a0333eba563cdb2fabbb384e62e7d560d6a1c2f347
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fc11dba33e335d98d80769a0333eba563cdb2fabbb384e62e7d560d6a1c2f347", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc11dba33e335d98d80769a0333eba563cdb2fabbb384e62e7d560d6a1c2f347", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc11dba33e335d98d80769a0333eba563cdb2fabbb384e62e7d560d6a1c2f347", kill_on_drop: false }`
[INFO] [stdout] fc11dba33e335d98d80769a0333eba563cdb2fabbb384e62e7d560d6a1c2f347
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3fc0bf9ead6b63a86673c53de1c100c66aaf5ff23f4b646a03a80bb9b9f9717e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3fc0bf9ead6b63a86673c53de1c100c66aaf5ff23f4b646a03a80bb9b9f9717e", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.71
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking crossbeam-utils v0.8.4
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]     Checking term v0.7.0
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.4
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking rayon v1.5.0
[INFO] [stderr]     Checking slog-term v2.8.0
[INFO] [stderr]    Compiling zerogc-derive v0.2.0-alpha.2
[INFO] [stderr]     Checking zerogc v0.2.0-alpha.2
[INFO] [stderr]     Checking zerogc-context v0.2.0-alpha.2
[INFO] [stderr]     Checking zerogc-simple v0.2.0-alpha.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `zerogc_derive`
[INFO] [stdout]  --> examples/binary_trees.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use zerogc_derive::Trace;
[INFO] [stdout]   |     ^^^^^^^^^^^^^ use of undeclared crate or module `zerogc_derive`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot determine resolution for the derive macro `Trace`
[INFO] [stdout]   --> examples/binary_trees.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[derive(Trace)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `zerogc_derive`
[INFO] [stdout]  --> examples/binary_trees_parallel.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use zerogc_derive::Trace;
[INFO] [stdout]   |     ^^^^^^^^^^^^^ use of undeclared crate or module `zerogc_derive`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot determine resolution for the derive macro `Trace`
[INFO] [stdout]   --> examples/binary_trees_parallel.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Trace)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `zerogc` in this scope
[INFO] [stdout]   --> examples/binary_trees.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[zerogc(collector_id(SimpleCollectorId))]
[INFO] [stdout]    |   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `zerogc` in this scope
[INFO] [stdout]   --> examples/binary_trees.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 |     #[zerogc(mutable(public))]
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `CollectorId as SimpleCollectorId`
[INFO] [stdout]  --> examples/binary_trees.rs:5:66
[INFO] [stdout]   |
[INFO] [stdout] 5 | use zerogc_simple::{SimpleCollector, SimpleCollectorContext, Gc, CollectorId as SimpleCollectorId};
[INFO] [stdout]   |                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `zerogc` in this scope
[INFO] [stdout]   --> examples/binary_trees_parallel.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[zerogc(collector_id(SimpleCollectorId))]
[INFO] [stdout]    |   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `zerogc` in this scope
[INFO] [stdout]   --> examples/binary_trees_parallel.rs:14:7
[INFO] [stdout]    |
[INFO] [stdout] 14 |     #[zerogc(mutable(public))]
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `CollectorId as SimpleCollectorId`
[INFO] [stdout]  --> examples/binary_trees_parallel.rs:5:66
[INFO] [stdout]   |
[INFO] [stdout] 5 | use zerogc_simple::{SimpleCollector, SimpleCollectorContext, Gc, CollectorId as SimpleCollectorId};
[INFO] [stdout]   |                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Tree<'gc>: GcSafe` is not satisfied
[INFO] [stdout]    --> examples/binary_trees_parallel.rs:27:27
[INFO] [stdout]     |
[INFO] [stdout] 27  |                        -> Gc<'gc, Tree<'gc>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^ the trait `GcSafe` is not implemented for `Tree<'gc>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/zerogc-0.2.0-alpha.2/src/lib.rs:414:23
[INFO] [stdout]     |
[INFO] [stdout] 414 | pub struct Gc<'gc, T: GcSafe + ?Sized + 'gc, Id: CollectorId> {
[INFO] [stdout]     |                       ------ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Tree<'gc>: GcSafe` is not satisfied
[INFO] [stdout]    --> examples/binary_trees.rs:26:27
[INFO] [stdout]     |
[INFO] [stdout] 26  |                        -> Gc<'gc, Tree<'gc>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^ the trait `GcSafe` is not implemented for `Tree<'gc>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/zerogc-0.2.0-alpha.2/src/lib.rs:414:23
[INFO] [stdout]     |
[INFO] [stdout] 414 | pub struct Gc<'gc, T: GcSafe + ?Sized + 'gc, Id: CollectorId> {
[INFO] [stdout]     |                       ------ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Tree<'gc>: GcSafe` is not satisfied
[INFO] [stdout]    --> examples/binary_trees_parallel.rs:15:15
[INFO] [stdout]     |
[INFO] [stdout] 15  |     children: GcCell<Option<(Gc<'gc, Tree<'gc>>, Gc<'gc, Tree<'gc>>)>>,
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `GcSafe` is not implemented for `Tree<'gc>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/zerogc-0.2.0-alpha.2/src/lib.rs:414:23
[INFO] [stdout]     |
[INFO] [stdout] 414 | pub struct Gc<'gc, T: GcSafe + ?Sized + 'gc, Id: CollectorId> {
[INFO] [stdout]     |                       ------ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Tree<'gc>: GcSafe` is not satisfied
[INFO] [stdout]    --> examples/binary_trees.rs:14:15
[INFO] [stdout]     |
[INFO] [stdout] 14  |     children: GcCell<Option<(Gc<'gc, Tree<'gc>>, Gc<'gc, Tree<'gc>>)>>,
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `GcSafe` is not implemented for `Tree<'gc>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/zerogc-0.2.0-alpha.2/src/lib.rs:414:23
[INFO] [stdout]     |
[INFO] [stdout] 414 | pub struct Gc<'gc, T: GcSafe + ?Sized + 'gc, Id: CollectorId> {
[INFO] [stdout]     |                       ------ required by this bound in `Gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0432.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `zerogc-simple`
[INFO] [stdout] Some errors have detailed explanations: E0277, E0432.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3fc0bf9ead6b63a86673c53de1c100c66aaf5ff23f4b646a03a80bb9b9f9717e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fc0bf9ead6b63a86673c53de1c100c66aaf5ff23f4b646a03a80bb9b9f9717e", kill_on_drop: false }`
[INFO] [stdout] 3fc0bf9ead6b63a86673c53de1c100c66aaf5ff23f4b646a03a80bb9b9f9717e