[INFO] crate rust-mpfr 0.1.7 is already in cache
[INFO] extracting crate rust-mpfr 0.1.7 into work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/reg/rust-mpfr/0.1.7
[INFO] extracting crate rust-mpfr 0.1.7 into work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/reg/rust-mpfr/0.1.7
[INFO] validating manifest of rust-mpfr-0.1.7 on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rust-mpfr-0.1.7 on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rust-mpfr-0.1.7
[INFO] finished frobbing rust-mpfr-0.1.7
[INFO] frobbed toml for rust-mpfr-0.1.7 written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/reg/rust-mpfr/0.1.7/Cargo.toml
[INFO] started frobbing rust-mpfr-0.1.7
[INFO] finished frobbing rust-mpfr-0.1.7
[INFO] frobbed toml for rust-mpfr-0.1.7 written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/reg/rust-mpfr/0.1.7/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking rust-mpfr-0.1.7 against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-2/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/reg/rust-mpfr/0.1.7:/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" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5dd6fe1fd24bc7704f415b4a68ef5c75916a595a765698777d3a8d8f08a0abc3
[INFO] running `"docker" "start" "-a" "5dd6fe1fd24bc7704f415b4a68ef5c75916a595a765698777d3a8d8f08a0abc3"`
[INFO] [stderr]     Checking rust-mpfr v0.1.7 (/opt/crater/workdir)
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/test.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     x / y;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `"docker" "inspect" "5dd6fe1fd24bc7704f415b4a68ef5c75916a595a765698777d3a8d8f08a0abc3"`
[INFO] running `"docker" "rm" "-f" "5dd6fe1fd24bc7704f415b4a68ef5c75916a595a765698777d3a8d8f08a0abc3"`
[INFO] [stdout] 5dd6fe1fd24bc7704f415b4a68ef5c75916a595a765698777d3a8d8f08a0abc3