[INFO] fetching crate gc 0.3.3...
[INFO] checking gc-0.3.3 against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] extracting crate gc 0.3.3 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate gc 0.3.3 on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate gc 0.3.3
[INFO] finished tweaking crates.io crate gc 0.3.3
[INFO] tweaked toml for crates.io crate gc 0.3.3 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 090b632f6716f4917c2d457366546650515a4330f75df90881fddf7fe1cd7928
[INFO] running `"docker" "start" "-a" "090b632f6716f4917c2d457366546650515a4330f75df90881fddf7fe1cd7928"`
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking gc v0.3.3 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/gc.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | /// Whether or not the thread is currently in the sweep phase of garbage collection.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macros
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/gc.rs:42:1
[INFO] [stderr]    |
[INFO] [stderr] 42 | /// During this phase, attempts to dereference a `Gc<T>` pointer will trigger a panic.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macros
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/gc.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | /// The garbage collector's internal state.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macros
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/gc.rs:18:39
[INFO] [stderr]    |
[INFO] [stderr] 18 |     boxes_start: Option<NonNull<GcBox<Trace>>>,
[INFO] [stderr]    |                                       ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/gc.rs:72:32
[INFO] [stderr]    |
[INFO] [stderr] 72 |     next: Option<NonNull<GcBox<Trace>>>,
[INFO] [stderr]    |                                ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gc.rs:155:45
[INFO] [stderr]     |
[INFO] [stderr] 155 |         incoming: *mut Option<NonNull<GcBox<Trace>>>,
[INFO] [stderr]     |                                             ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gc.rs:156:29
[INFO] [stderr]     |
[INFO] [stderr] 156 |         this: NonNull<GcBox<Trace>>,
[INFO] [stderr]     |                             ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gc.rs:158:52
[INFO] [stderr]     |
[INFO] [stderr] 158 |     unsafe fn mark(head: &mut Option<NonNull<GcBox<Trace>>>) -> Vec<Unmarked> {
[INFO] [stderr]     |                                                    ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stderr] 
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr] error[E0606]: casting `f64` as `usize` is invalid
[INFO] [stderr]   --> src/gc.rs:98:36
[INFO] [stderr]    |
[INFO] [stderr] 98 |                     st.threshold = (st.bytes_allocated as f64 / USED_SPACE_RATIO) as usize
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0606`.
[INFO] [stderr] error: could not compile `gc`.
[INFO] [stderr] 
[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 `"docker" "inspect" "090b632f6716f4917c2d457366546650515a4330f75df90881fddf7fe1cd7928"`
[INFO] running `"docker" "rm" "-f" "090b632f6716f4917c2d457366546650515a4330f75df90881fddf7fe1cd7928"`
[INFO] [stdout] 090b632f6716f4917c2d457366546650515a4330f75df90881fddf7fe1cd7928