[INFO] crate mwmatching 0.1.1 is already in cache
[INFO] checking mwmatching-0.1.1 against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] extracting crate mwmatching 0.1.1 into work/builds/worker-5/source
[INFO] validating manifest of crates.io crate mwmatching 0.1.1 on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate mwmatching 0.1.1
[INFO] finished tweaking crates.io crate mwmatching 0.1.1
[INFO] tweaked toml for crates.io crate mwmatching 0.1.1 written to work/builds/worker-5/source/Cargo.toml
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 820bdb5b8effe72dd2354a7640b0209fdb320a695619e1c10f774eb65a398eb7
[INFO] running `"docker" "start" "-a" "820bdb5b8effe72dd2354a7640b0209fdb320a695619e1c10f774eb65a398eb7"`
[INFO] [stderr]     Checking mwmatching v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:744:25
[INFO] [stderr]     |
[INFO] [stderr] 744 |                     let mut k = p / 2;
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:852:29
[INFO] [stderr]     |
[INFO] [stderr] 852 |                         let mut k = p / 2;
[INFO] [stderr]     |                             ----^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:744:25
[INFO] [stderr]     |
[INFO] [stderr] 744 |                     let mut k = p / 2;
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:852:29
[INFO] [stderr]     |
[INFO] [stderr] 852 |                         let mut k = p / 2;
[INFO] [stderr]     |                             ----^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] error[E0464]: multiple matching crates for `rand`
[INFO] [stderr]  --> examples/largedata/main.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | extern crate rand;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: candidates:
[INFO] [stderr]           crate `rand`: /opt/rustwide/rustup-home/toolchains/c9edc02e8320a9e5799d185910ece7d491f524e6-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librand-f00608bd7edcd617.rlib
[INFO] [stderr]           crate `rand`: /opt/rustwide/rustup-home/toolchains/c9edc02e8320a9e5799d185910ece7d491f524e6-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librand-03c4b6cba646a45b.rlib
[INFO] [stderr] 
[INFO] [stderr] error[E0463]: can't find crate for `rand`
[INFO] [stderr]  --> examples/largedata/main.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | extern crate rand;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `mwmatching`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "820bdb5b8effe72dd2354a7640b0209fdb320a695619e1c10f774eb65a398eb7"`
[INFO] running `"docker" "rm" "-f" "820bdb5b8effe72dd2354a7640b0209fdb320a695619e1c10f774eb65a398eb7"`
[INFO] [stdout] 820bdb5b8effe72dd2354a7640b0209fdb320a695619e1c10f774eb65a398eb7