[INFO] fetching crate copying_gc 0.1.0...
[INFO] testing copying_gc-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate copying_gc 0.1.0 into /workspace/builds/worker-28/source
[INFO] validating manifest of crates.io crate copying_gc 0.1.0 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 copying_gc 0.1.0
[INFO] finished tweaking crates.io crate copying_gc 0.1.0
[INFO] tweaked toml for crates.io crate copying_gc 0.1.0 written to /workspace/builds/worker-28/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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] 9829633a5fbf96ec005bd1a93adb4febc0fc3473b2dfb394cfc74b1d91b973bc
[INFO] running `Command { std: "docker" "start" "-a" "9829633a5fbf96ec005bd1a93adb4febc0fc3473b2dfb394cfc74b1d91b973bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9829633a5fbf96ec005bd1a93adb4febc0fc3473b2dfb394cfc74b1d91b973bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9829633a5fbf96ec005bd1a93adb4febc0fc3473b2dfb394cfc74b1d91b973bc", kill_on_drop: false }`
[INFO] [stdout] 9829633a5fbf96ec005bd1a93adb4febc0fc3473b2dfb394cfc74b1d91b973bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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] 18bfeba957df72281618dd9ded12efdf334a203659e7d32d93212f5bcbd2cd33
[INFO] running `Command { std: "docker" "start" "-a" "18bfeba957df72281618dd9ded12efdf334a203659e7d32d93212f5bcbd2cd33", kill_on_drop: false }`
[INFO] [stderr]    Compiling copying_gc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `alloc::heap`
[INFO] [stdout]  --> src/bitmap.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use alloc::heap;
[INFO] [stdout]   |     ^^^^^^^^^^^ no `heap` in the root
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `alloc::heap`
[INFO] [stdout]  --> src/space.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use alloc::heap as alloc_heap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ no `heap` in the root
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/space.rs:89:59
[INFO] [stdout]    |
[INFO] [stdout] 89 |                 let forwarded = *(ptr.raw_inner() as *mut (*mut u8));
[INFO] [stdout]    |                                                           ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 89 -                 let forwarded = *(ptr.raw_inner() as *mut (*mut u8));
[INFO] [stdout] 89 +                 let forwarded = *(ptr.raw_inner() as *mut *mut u8);
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/trace.rs:28:45
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn trace_with<'a, Tracer>(&'a mut self, Tracer) where Tracer: FnMut(&'a mut HeapTrait);
[INFO] [stdout]    |                                             ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Tracer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/ptr.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn realloc_to(&mut self, &mut Space);
[INFO] [stdout]    |                              ^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut Space`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/ptr.rs:85:46
[INFO] [stdout]    |
[INFO] [stdout] 85 |             *(self.space_ptr.inner() as *mut (*mut T)) = space_ptr.inner();
[INFO] [stdout]    |                                              ^      ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 85 -             *(self.space_ptr.inner() as *mut (*mut T)) = space_ptr.inner();
[INFO] [stdout] 85 +             *(self.space_ptr.inner() as *mut *mut T) = space_ptr.inner();
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/runtime.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 |     allocated: Vec<Box<RootedTrait>>,
[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] 11 -     allocated: Vec<Box<RootedTrait>>,
[INFO] [stdout] 11 +     allocated: Vec<Box<dyn RootedTrait>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space.rs:65:39
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn realloc(&mut self, p: &mut RootedTrait) {
[INFO] [stdout]    |                                       ^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 65 -     pub fn realloc(&mut self, p: &mut RootedTrait) {
[INFO] [stdout] 65 +     pub fn realloc(&mut self, p: &mut dyn RootedTrait) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space.rs:77:34
[INFO] [stdout]    |
[INFO] [stdout] 77 |     pub fn marked(&mut self, p: &HeapTrait) -> bool {
[INFO] [stdout]    |                                  ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 77 -     pub fn marked(&mut self, p: &HeapTrait) -> bool {
[INFO] [stdout] 77 +     pub fn marked(&mut self, p: &dyn HeapTrait) -> bool {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space.rs:85:41
[INFO] [stdout]    |
[INFO] [stdout] 85 |     pub fn forward(&mut self, ptr: &mut HeapTrait) {
[INFO] [stdout]    |                                         ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 -     pub fn forward(&mut self, ptr: &mut HeapTrait) {
[INFO] [stdout] 85 +     pub fn forward(&mut self, ptr: &mut dyn HeapTrait) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/trace.rs:18:41
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn subfields(&mut self) -> Vec<&mut HeapTrait>;
[INFO] [stdout]    |                                         ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 18 -     fn subfields(&mut self) -> Vec<&mut HeapTrait>;
[INFO] [stdout] 18 +     fn subfields(&mut self) -> Vec<&mut dyn HeapTrait>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/trace.rs:28:81
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn trace_with<'a, Tracer>(&'a mut self, Tracer) where Tracer: FnMut(&'a mut HeapTrait);
[INFO] [stdout]    |                                                                                 ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -     fn trace_with<'a, Tracer>(&'a mut self, Tracer) where Tracer: FnMut(&'a mut HeapTrait);
[INFO] [stdout] 28 +     fn trace_with<'a, Tracer>(&'a mut self, Tracer) where Tracer: FnMut(&'a mut dyn HeapTrait);
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/trace.rs:24:84
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn trace_with<'a, Tracer>(&'a mut self, _: Tracer) where Tracer: FnMut(&'a mut HeapTrait) { }
[INFO] [stdout]    |                                                                                    ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 24 -     fn trace_with<'a, Tracer>(&'a mut self, _: Tracer) where Tracer: FnMut(&'a mut HeapTrait) { }
[INFO] [stdout] 24 +     fn trace_with<'a, Tracer>(&'a mut self, _: Tracer) where Tracer: FnMut(&'a mut dyn HeapTrait) { }
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/trace.rs:45:41
[INFO] [stdout]    |
[INFO] [stdout] 45 |     fn subfields(&mut self) -> Vec<&mut HeapTrait> {
[INFO] [stdout]    |                                         ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -     fn subfields(&mut self) -> Vec<&mut HeapTrait> {
[INFO] [stdout] 45 +     fn subfields(&mut self) -> Vec<&mut dyn HeapTrait> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ptr.rs:14:37
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn space_ptr(&mut self) -> &mut SpacePtrTrait;
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 14 -     fn space_ptr(&mut self) -> &mut SpacePtrTrait;
[INFO] [stdout] 14 +     fn space_ptr(&mut self) -> &mut dyn SpacePtrTrait;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ptr.rs:77:37
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn space_ptr(&mut self) -> &mut SpacePtrTrait {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 77 -     fn space_ptr(&mut self) -> &mut SpacePtrTrait {
[INFO] [stdout] 77 +     fn space_ptr(&mut self) -> &mut dyn SpacePtrTrait {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ptr.rs:95:42
[INFO] [stdout]    |
[INFO] [stdout] 95 |     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout]    |                                          ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 95 -     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout] 95 +     fn subfields(&mut self)  -> Vec<&mut dyn HeapTrait> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ptr.rs:111:30
[INFO] [stdout]     |
[INFO] [stdout] 111 |     fn inner(&self) -> *mut (Trace + 'static) { self.0.inner() }
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 111 -     fn inner(&self) -> *mut (Trace + 'static) { self.0.inner() }
[INFO] [stdout] 111 +     fn inner(&self) -> *mut (dyn Trace + 'static) { self.0.inner() }
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ptr.rs:121:42
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout]     |                                          ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 121 -     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout] 121 +     fn subfields(&mut self)  -> Vec<&mut dyn HeapTrait> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/space_ptr.rs:6:30
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn inner(&self) -> *mut (Trace + 'static);
[INFO] [stdout]   |                              ^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 6 -     fn inner(&self) -> *mut (Trace + 'static);
[INFO] [stdout] 6 +     fn inner(&self) -> *mut (dyn Trace + 'static);
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space_ptr.rs:39:42
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout]    |                                          ^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 39 -     fn subfields(&mut self)  -> Vec<&mut HeapTrait> {
[INFO] [stdout] 39 +     fn subfields(&mut self)  -> Vec<&mut dyn HeapTrait> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space_ptr.rs:45:30
[INFO] [stdout]    |
[INFO] [stdout] 45 |     fn inner(&self) -> *mut (Trace + 'static) {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -     fn inner(&self) -> *mut (Trace + 'static) {
[INFO] [stdout] 45 +     fn inner(&self) -> *mut (dyn Trace + 'static) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/runtime.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let mut new_allocated: Vec<Box<RootedTrait>> = vec![];
[INFO] [stdout]    |                                        ^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 43 -         let mut new_allocated: Vec<Box<RootedTrait>> = vec![];
[INFO] [stdout] 43 +         let mut new_allocated: Vec<Box<dyn RootedTrait>> = vec![];
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/space_ptr.rs:46:29
[INFO] [stdout]    |
[INFO] [stdout] 46 |         self.inner as *mut (Trace + 'static)
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 46 -         self.inner as *mut (Trace + 'static)
[INFO] [stdout] 46 +         self.inner as *mut (dyn Trace + 'static)
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `copying_gc` due to 3 previous errors; 22 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "18bfeba957df72281618dd9ded12efdf334a203659e7d32d93212f5bcbd2cd33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18bfeba957df72281618dd9ded12efdf334a203659e7d32d93212f5bcbd2cd33", kill_on_drop: false }`
[INFO] [stdout] 18bfeba957df72281618dd9ded12efdf334a203659e7d32d93212f5bcbd2cd33