[INFO] crate classgroup 0.1.0 is already in cache
[INFO] extracting crate classgroup 0.1.0 into work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/classgroup/0.1.0
[INFO] extracting crate classgroup 0.1.0 into work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/classgroup/0.1.0
[INFO] validating manifest of classgroup-0.1.0 on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of classgroup-0.1.0 on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing classgroup-0.1.0
[INFO] finished frobbing classgroup-0.1.0
[INFO] frobbed toml for classgroup-0.1.0 written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/classgroup/0.1.0/Cargo.toml
[INFO] started frobbing classgroup-0.1.0
[INFO] finished frobbing classgroup-0.1.0
[INFO] frobbed toml for classgroup-0.1.0 written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/classgroup/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking classgroup-0.1.0 against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-2/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/classgroup/0.1.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 01709066647fb57482a82091ea1cf35d777dce5330427a650bcb0bf7d53562dc
[INFO] running `"docker" "start" "-a" "01709066647fb57482a82091ea1cf35d777dce5330427a650bcb0bf7d53562dc"`
[INFO] [stderr]     Checking classgroup v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gmp/mpz.rs:487:40
[INFO] [stderr]     |
[INFO] [stderr] 487 |     fn cause(&self) -> Option<&'static Error> {
[INFO] [stderr]     |                                        ^^^^^ help: use `dyn`: `dyn Error`
[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/gmp/mpz.rs:487:40
[INFO] [stderr]     |
[INFO] [stderr] 487 |     fn cause(&self) -> Option<&'static Error> {
[INFO] [stderr]     |                                        ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `gmp`
[INFO] [stderr]   --> bench/bench.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | use gmp::mpz::Mpz;
[INFO] [stderr]    |     ^^^ use of undeclared type or module `gmp`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Mpz`
[INFO] [stderr]   --> bench/bench.rs:25:23
[INFO] [stderr]    |
[INFO] [stderr] 25 |         let m_2048 = -Mpz::from_str(
[INFO] [stderr]    |                       ^^^ use of undeclared type or module `Mpz`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Mpz`
[INFO] [stderr]   --> bench/bench.rs:39:23
[INFO] [stderr]    |
[INFO] [stderr] 39 |         let m_1024 = -Mpz::from_str(
[INFO] [stderr]    |                       ^^^ use of undeclared type or module `Mpz`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `gmp::mpz::Mpz`
[INFO] [stderr]   --> bench/bench.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | use gmp::mpz::Mpz;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::str::FromStr`
[INFO] [stderr]   --> bench/bench.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 | use std::str::FromStr;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `classgroup`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "01709066647fb57482a82091ea1cf35d777dce5330427a650bcb0bf7d53562dc"`
[INFO] running `"docker" "rm" "-f" "01709066647fb57482a82091ea1cf35d777dce5330427a650bcb0bf7d53562dc"`
[INFO] [stdout] 01709066647fb57482a82091ea1cf35d777dce5330427a650bcb0bf7d53562dc