[INFO] fetching crate gc 0.5.1...
[INFO] testing gc-0.5.1 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate gc 0.5.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate gc 0.5.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate gc 0.5.1
[INFO] tweaked toml for crates.io crate gc 0.5.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate gc 0.5.1 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate gc 0.5.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gc_derive v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d7ade765aa35241e93568d8fae2bdc385b475bcb0e1f3e13ebcced27eecbccf5
[INFO] running `Command { std: "docker" "start" "-a" "d7ade765aa35241e93568d8fae2bdc385b475bcb0e1f3e13ebcced27eecbccf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7ade765aa35241e93568d8fae2bdc385b475bcb0e1f3e13ebcced27eecbccf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7ade765aa35241e93568d8fae2bdc385b475bcb0e1f3e13ebcced27eecbccf5", kill_on_drop: false }`
[INFO] [stdout] d7ade765aa35241e93568d8fae2bdc385b475bcb0e1f3e13ebcced27eecbccf5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 80248c0db08b2d2eebe40c487e253314f01a32efc288dcdbe2ddecb7cf47e7a4
[INFO] running `Command { std: "docker" "start" "-a" "80248c0db08b2d2eebe40c487e253314f01a32efc288dcdbe2ddecb7cf47e7a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling gc v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `Command { std: "docker" "inspect" "80248c0db08b2d2eebe40c487e253314f01a32efc288dcdbe2ddecb7cf47e7a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80248c0db08b2d2eebe40c487e253314f01a32efc288dcdbe2ddecb7cf47e7a4", kill_on_drop: false }`
[INFO] [stdout] 80248c0db08b2d2eebe40c487e253314f01a32efc288dcdbe2ddecb7cf47e7a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10a17e12e5f90c0cf90f21c10dd371f3bfdab36aec1cbbc26303ef5521dffc61
[INFO] running `Command { std: "docker" "start" "-a" "10a17e12e5f90c0cf90f21c10dd371f3bfdab36aec1cbbc26303ef5521dffc61", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling serde_json v1.0.140
[INFO] [stderr]    Compiling gc v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> tests/finalize.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | #[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]  --> tests/finalize.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use gc::{Finalize, Trace};
[INFO] [stdout]   |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]   --> tests/finalize.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[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]   --> tests/finalize.rs:1:20
[INFO] [stdout]    |
[INFO] [stdout]  1 | use gc::{Finalize, Trace};
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]   --> tests/finalize.rs:37:10
[INFO] [stdout]    |
[INFO] [stdout] 37 | #[derive(Trace, Finalize)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]   --> tests/finalize.rs:1:20
[INFO] [stdout]    |
[INFO] [stdout]  1 | use gc::{Finalize, Trace};
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]   --> tests/finalize.rs:37:17
[INFO] [stdout]    |
[INFO] [stdout] 37 | #[derive(Trace, Finalize)]
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]   --> tests/finalize.rs:1:10
[INFO] [stdout]    |
[INFO] [stdout]  1 | use gc::{Finalize, Trace};
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]  --> tests/derive_bounds.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | #[derive(Finalize, Trace)]
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> tests/derive_bounds.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | use gc::{Finalize, Gc, Trace};
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]  --> tests/derive_bounds.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | #[derive(Finalize, Trace)]
[INFO] [stdout]   |                    ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]  --> tests/derive_bounds.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use gc::{Finalize, Gc, Trace};
[INFO] [stdout]   |                        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `A: Trace` is not satisfied
[INFO] [stdout]   --> tests/finalize.rs:44:20
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let _x = X(Box::new(A { b: B }));
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
[INFO] [stdout]    |
[INFO] [stdout] help: the trait `Trace` is not implemented for `A`
[INFO] [stdout]   --> tests/finalize.rs:8:1
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct A {
[INFO] [stdout]    | ^^^^^^^^
[INFO] [stdout]    = help: the following other types implement trait `Trace`:
[INFO] [stdout]              &'static T
[INFO] [stdout]              ()
[INFO] [stdout]              (A, B)
[INFO] [stdout]              (A, B, C)
[INFO] [stdout]              (A, B, C, D)
[INFO] [stdout]              (A, B, C, D, E)
[INFO] [stdout]              (A, B, C, D, E, F)
[INFO] [stdout]              (A, B, C, D, E, F, G)
[INFO] [stdout]            and 147 others
[INFO] [stdout]    = note: required for the cast from `Box<A>` to `Box<(dyn Trace + 'static)>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Thunk<NotTrace>: Trace` is not satisfied
[INFO] [stdout]   --> tests/derive_bounds.rs:11:42
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let _: Gc<Thunk<NotTrace>> = Gc::new(Thunk(|| NotTrace));
[INFO] [stdout]    |                                  ------- ^^^^^^^^^^^^^^^^^^ the trait `Trace` is not implemented for `Thunk<NotTrace>`
[INFO] [stdout]    |                                  |
[INFO] [stdout]    |                                  required by a bound introduced by this call
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]    |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout] 80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let _: Gc<Thunk<NotTrace>> = Gc::new(&Thunk(|| NotTrace));
[INFO] [stdout]    |                                          +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc` (test "finalize") due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]   --> tests/gc_semantics.rs:86:10
[INFO] [stdout]    |
[INFO] [stdout] 86 | #[derive(Trace, Finalize)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]   --> tests/gc_semantics.rs:1:47
[INFO] [stdout]    |
[INFO] [stdout]  1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]    |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]   --> tests/gc_semantics.rs:86:17
[INFO] [stdout]    |
[INFO] [stdout] 86 | #[derive(Trace, Finalize)]
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]   --> tests/gc_semantics.rs:1:25
[INFO] [stdout]    |
[INFO] [stdout]  1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]    |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:271:14
[INFO] [stdout]     |
[INFO] [stdout] 271 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |              ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:25
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:271:24
[INFO] [stdout]     |
[INFO] [stdout] 271 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |                        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:47
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc` (test "derive_bounds") due to 3 previous errors
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:273:14
[INFO] [stdout]     |
[INFO] [stdout] 273 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |              ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:25
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:273:24
[INFO] [stdout]     |
[INFO] [stdout] 273 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |                        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:47
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:295:14
[INFO] [stdout]     |
[INFO] [stdout] 295 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |              ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:25
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:295:24
[INFO] [stdout]     |
[INFO] [stdout] 295 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |                        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:47
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Finalize` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:298:14
[INFO] [stdout]     |
[INFO] [stdout] 298 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |              ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Finalize` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:25
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Trace` in this scope
[INFO] [stdout]    --> tests/gc_semantics.rs:298:24
[INFO] [stdout]     |
[INFO] [stdout] 298 |     #[derive(Finalize, Trace)]
[INFO] [stdout]     |                        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `Trace` is imported here, but it is only a trait, without a derive macro
[INFO] [stdout]    --> tests/gc_semantics.rs:1:47
[INFO] [stdout]     |
[INFO] [stdout]   1 | use gc::{force_collect, Finalize, Gc, GcCell, Trace};
[INFO] [stdout]     |                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `GcWatchCycle: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:117:29
[INFO] [stdout]     |
[INFO] [stdout] 117 |           let node1 = Gc::new(GcWatchCycle {
[INFO] [stdout]     |  _____________________-------_^
[INFO] [stdout]     | |                     |
[INFO] [stdout]     | |                     required by a bound introduced by this call
[INFO] [stdout] 118 | |             watch: GcWatch(&FLAGS1),
[INFO] [stdout] 119 | |             cycle: GcCell::new(None),
[INFO] [stdout] 120 | |         });
[INFO] [stdout]     | |_________^ the trait `Trace` is not implemented for `GcWatchCycle`
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 117 |         let node1 = Gc::new(&GcWatchCycle {
[INFO] [stdout]     |                             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `GcWatchCycle: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:122:29
[INFO] [stdout]     |
[INFO] [stdout] 122 |           let node2 = Gc::new(GcWatchCycle {
[INFO] [stdout]     |  _____________________-------_^
[INFO] [stdout]     | |                     |
[INFO] [stdout]     | |                     required by a bound introduced by this call
[INFO] [stdout] 123 | |             watch: GcWatch(&FLAGS2),
[INFO] [stdout] 124 | |             cycle: GcCell::new(Some(node1.clone())),
[INFO] [stdout] 125 | |         });
[INFO] [stdout]     | |_________^ the trait `Trace` is not implemented for `GcWatchCycle`
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let node2 = Gc::new(&GcWatchCycle {
[INFO] [stdout]     |                             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `borrow_mut` exists for struct `GcCell<Option<Gc<GcWatchCycle>>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:137:26
[INFO] [stdout]     |
[INFO] [stdout]  87 | struct GcWatchCycle {
[INFO] [stdout]     | ------------------- doesn't satisfy `GcWatchCycle: Trace`
[INFO] [stdout] ...
[INFO] [stdout] 137 |             *node1.cycle.borrow_mut() = Some(node2);
[INFO] [stdout]     |                          ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the following trait bounds were not satisfied:
[INFO] [stdout]             `GcWatchCycle: Trace`
[INFO] [stdout]             which is required by `Option<Gc<GcWatchCycle>>: Trace`
[INFO] [stdout] note: the trait `Trace` must be implemented
[INFO] [stdout]    --> /opt/rustwide/workdir/src/trace.rs:26:1
[INFO] [stdout]     |
[INFO] [stdout]  26 | pub unsafe trait Trace: Finalize {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: trait `BorrowMut` which provides `borrow_mut` is implemented but not in scope; perhaps you want to import it
[INFO] [stdout]     |
[INFO] [stdout]   1 + use std::borrow::BorrowMut;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `ptr_eq::A: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:276:21
[INFO] [stdout]     |
[INFO] [stdout] 276 |     let a = Gc::new(A);
[INFO] [stdout]     |             ------- ^ the trait `Trace` is not implemented for `ptr_eq::A`
[INFO] [stdout]     |             |
[INFO] [stdout]     |             required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 276 |     let a = Gc::new(&A);
[INFO] [stdout]     |                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `ptr_eq::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:279:21
[INFO] [stdout]     |
[INFO] [stdout] 279 |     let b = Gc::new(B(aa));
[INFO] [stdout]     |             ------- ^^^^^ the trait `Trace` is not implemented for `ptr_eq::B`
[INFO] [stdout]     |             |
[INFO] [stdout]     |             required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 279 |     let b = Gc::new(&B(aa));
[INFO] [stdout]     |                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `ptr_eq::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:281:22
[INFO] [stdout]     |
[INFO] [stdout] 281 |     let bb = Gc::new(B(a.clone()));
[INFO] [stdout]     |              ------- ^^^^^^^^^^^^ the trait `Trace` is not implemented for `ptr_eq::B`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 281 |     let bb = Gc::new(&B(a.clone()));
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `ptr_eq::A: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:284:22
[INFO] [stdout]     |
[INFO] [stdout] 284 |     let a2 = Gc::new(A);
[INFO] [stdout]     |              ------- ^ the trait `Trace` is not implemented for `ptr_eq::A`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 284 |     let a2 = Gc::new(&A);
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `ptr_eq::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:286:22
[INFO] [stdout]     |
[INFO] [stdout] 286 |     let b2 = Gc::new(B(a2.clone()));
[INFO] [stdout]     |              ------- ^^^^^^^^^^^^^ the trait `Trace` is not implemented for `ptr_eq::B`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 286 |     let b2 = Gc::new(&B(a2.clone()));
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `as_ptr::A: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:301:21
[INFO] [stdout]     |
[INFO] [stdout] 301 |     let a = Gc::new(A);
[INFO] [stdout]     |             ------- ^ the trait `Trace` is not implemented for `as_ptr::A`
[INFO] [stdout]     |             |
[INFO] [stdout]     |             required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 301 |     let a = Gc::new(&A);
[INFO] [stdout]     |                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `as_ptr::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:306:21
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let b = Gc::new(B(a.clone()));
[INFO] [stdout]     |             ------- ^^^^^^^^^^^^ the trait `Trace` is not implemented for `as_ptr::B`
[INFO] [stdout]     |             |
[INFO] [stdout]     |             required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let b = Gc::new(&B(a.clone()));
[INFO] [stdout]     |                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `as_ptr::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:308:22
[INFO] [stdout]     |
[INFO] [stdout] 308 |     let bb = Gc::new(B(a.clone()));
[INFO] [stdout]     |              ------- ^^^^^^^^^^^^ the trait `Trace` is not implemented for `as_ptr::B`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 308 |     let bb = Gc::new(&B(a.clone()));
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `as_ptr::A: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:311:22
[INFO] [stdout]     |
[INFO] [stdout] 311 |     let a2 = Gc::new(A);
[INFO] [stdout]     |              ------- ^ the trait `Trace` is not implemented for `as_ptr::A`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 311 |     let a2 = Gc::new(&A);
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `as_ptr::B: Trace` is not satisfied
[INFO] [stdout]    --> tests/gc_semantics.rs:314:22
[INFO] [stdout]     |
[INFO] [stdout] 314 |     let b2 = Gc::new(B(a2.clone()));
[INFO] [stdout]     |              ------- ^^^^^^^^^^^^^ the trait `Trace` is not implemented for `as_ptr::B`
[INFO] [stdout]     |              |
[INFO] [stdout]     |              required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `Gc::<T>::new`
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:65:9
[INFO] [stdout]     |
[INFO] [stdout]  65 | impl<T: Trace> Gc<T> {
[INFO] [stdout]     |         ^^^^^ required by this bound in `Gc::<T>::new`
[INFO] [stdout] ...
[INFO] [stdout]  80 |     pub fn new(value: T) -> Self {
[INFO] [stdout]     |            --- required by a bound in this associated function
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]     |
[INFO] [stdout] 314 |     let b2 = Gc::new(&B(a2.clone()));
[INFO] [stdout]     |                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc` (test "gc_semantics") due to 23 previous errors
[INFO] running `Command { std: "docker" "inspect" "10a17e12e5f90c0cf90f21c10dd371f3bfdab36aec1cbbc26303ef5521dffc61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10a17e12e5f90c0cf90f21c10dd371f3bfdab36aec1cbbc26303ef5521dffc61", kill_on_drop: false }`
[INFO] [stdout] 10a17e12e5f90c0cf90f21c10dd371f3bfdab36aec1cbbc26303ef5521dffc61
