[INFO] fetching crate proofsize_derive 0.1.0...
[INFO] checking proofsize_derive-0.1.0 against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] extracting crate proofsize_derive 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate proofsize_derive 0.1.0 on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate proofsize_derive 0.1.0
[INFO] finished tweaking crates.io crate proofsize_derive 0.1.0
[INFO] tweaked toml for crates.io crate proofsize_derive 0.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ad5da5bb418d12f477d5f71f26f2cbcff953c6ffaf8441af650874b69ac3bd6
[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" "5ad5da5bb418d12f477d5f71f26f2cbcff953c6ffaf8441af650874b69ac3bd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ad5da5bb418d12f477d5f71f26f2cbcff953c6ffaf8441af650874b69ac3bd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ad5da5bb418d12f477d5f71f26f2cbcff953c6ffaf8441af650874b69ac3bd6", kill_on_drop: false }`
[INFO] [stdout] 5ad5da5bb418d12f477d5f71f26f2cbcff953c6ffaf8441af650874b69ac3bd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 032fe1f95797d93a1b0f97450a627dc2f2c2b47b56bc6813c292b30f16e8ab5f
[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" "032fe1f95797d93a1b0f97450a627dc2f2c2b47b56bc6813c292b30f16e8ab5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]     Checking synstructure v0.12.4
[INFO] [stderr]     Checking proofsize_derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `rug_binserial`
[INFO] [stdout]   --> tests/test.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     #[derive(ProofSize)]
[INFO] [stdout]    |              ^^^^^^^^^ can't find crate
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proofsize_derive`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "032fe1f95797d93a1b0f97450a627dc2f2c2b47b56bc6813c292b30f16e8ab5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "032fe1f95797d93a1b0f97450a627dc2f2c2b47b56bc6813c292b30f16e8ab5f", kill_on_drop: false }`
[INFO] [stdout] 032fe1f95797d93a1b0f97450a627dc2f2c2b47b56bc6813c292b30f16e8ab5f