[INFO] fetching crate eko-gc 0.0.2...
[INFO] checking eko-gc-0.0.2 against try#012cd62c9add58ab3910e44c137d87db3ab70f61 for pr-155915
[INFO] extracting crate eko-gc 0.0.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate eko-gc 0.0.2
[INFO] finished tweaking crates.io crate eko-gc 0.0.2
[INFO] tweaked toml for crates.io crate eko-gc 0.0.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate eko-gc 0.0.2 on toolchain 012cd62c9add58ab3910e44c137d87db3ab70f61
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2cb45bba1ef1f0ab3e0cb95f8c102a2f53d1849c1727c44114421cabcf6348a5
[INFO] running `Command { std: "docker" "start" "-a" "2cb45bba1ef1f0ab3e0cb95f8c102a2f53d1849c1727c44114421cabcf6348a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2cb45bba1ef1f0ab3e0cb95f8c102a2f53d1849c1727c44114421cabcf6348a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cb45bba1ef1f0ab3e0cb95f8c102a2f53d1849c1727c44114421cabcf6348a5", kill_on_drop: false }`
[INFO] [stdout] 2cb45bba1ef1f0ab3e0cb95f8c102a2f53d1849c1727c44114421cabcf6348a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c75ef8279e201e50dec2fc0a33f6cc766e5d682dfe3cc1c9253cf7219edb691
[INFO] running `Command { std: "docker" "start" "-a" "3c75ef8279e201e50dec2fc0a33f6cc766e5d682dfe3cc1c9253cf7219edb691", kill_on_drop: false }`
[INFO] [stderr]     Checking eko-gc v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:42:47
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                               ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, dyn Trace>>>,
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_box.rs:22:46
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, dyn Trace>>>,
[INFO] [stdout]    |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:74:28
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<dyn Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<Trace>> = Vec::new();
[INFO] [stdout]    |                                      ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<dyn Trace>> = Vec::new();
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:42:47
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                               ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, dyn Trace>>>,
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_box.rs:22:46
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, dyn Trace>>>,
[INFO] [stdout]    |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |   fn inner(&self) -> &GcBox<T>;
[INFO] [stdout]    |            ^^^^^     ^^^^^^^^^
[INFO] [stdout]    |            |         ||
[INFO] [stdout]    |            |         |the same lifetime is hidden here
[INFO] [stdout]    |            |         the same lifetime is elided here
[INFO] [stdout]    |            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 |   fn inner(&self) -> &GcBox<'_, T>;
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |   fn inner(&self) -> &GcBox<T> {
[INFO] [stdout]    |            ^^^^^     ^^^^^^^^^
[INFO] [stdout]    |            |         ||
[INFO] [stdout]    |            |         |the same lifetime is hidden here
[INFO] [stdout]    |            |         the same lifetime is elided here
[INFO] [stdout]    |            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 39 |   fn inner(&self) -> &GcBox<'_, T> {
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc_ref_cell.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn borrow(&self) -> GcRef<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn borrow(&self) -> GcRef<'_, T> {
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc_ref_cell.rs:27:21
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn borrow_mut(&self) -> GcRefMut<T> {
[INFO] [stdout]    |                     ^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn borrow_mut(&self) -> GcRefMut<'_, T> {
[INFO] [stdout]    |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:74:28
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<dyn Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<Trace>> = Vec::new();
[INFO] [stdout]    |                                      ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<dyn Trace>> = Vec::new();
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |   fn inner(&self) -> &GcBox<T>;
[INFO] [stdout]    |            ^^^^^     ^^^^^^^^^
[INFO] [stdout]    |            |         ||
[INFO] [stdout]    |            |         |the same lifetime is hidden here
[INFO] [stdout]    |            |         the same lifetime is elided here
[INFO] [stdout]    |            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 |   fn inner(&self) -> &GcBox<'_, T>;
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |   fn inner(&self) -> &GcBox<T> {
[INFO] [stdout]    |            ^^^^^     ^^^^^^^^^
[INFO] [stdout]    |            |         ||
[INFO] [stdout]    |            |         |the same lifetime is hidden here
[INFO] [stdout]    |            |         the same lifetime is elided here
[INFO] [stdout]    |            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 39 |   fn inner(&self) -> &GcBox<'_, T> {
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc_ref_cell.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn borrow(&self) -> GcRef<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn borrow(&self) -> GcRef<'_, T> {
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/gc_ref_cell.rs:27:21
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn borrow_mut(&self) -> GcRefMut<T> {
[INFO] [stdout]    |                     ^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn borrow_mut(&self) -> GcRefMut<'_, T> {
[INFO] [stdout]    |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "3c75ef8279e201e50dec2fc0a33f6cc766e5d682dfe3cc1c9253cf7219edb691", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c75ef8279e201e50dec2fc0a33f6cc766e5d682dfe3cc1c9253cf7219edb691", kill_on_drop: false }`
[INFO] [stdout] 3c75ef8279e201e50dec2fc0a33f6cc766e5d682dfe3cc1c9253cf7219edb691
