[INFO] updating cached repository c7x43t/hello_cargo2
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/c7x43t/hello_cargo2
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/c7x43t/hello_cargo2" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/c7x43t/hello_cargo2"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/c7x43t/hello_cargo2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/c7x43t/hello_cargo2" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/c7x43t/hello_cargo2"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/c7x43t/hello_cargo2'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ca56607fc36473d00a8f684a3409f93a3db5c595
[INFO] sha for GitHub repo c7x43t/hello_cargo2: ca56607fc36473d00a8f684a3409f93a3db5c595
[INFO] validating manifest of c7x43t/hello_cargo2 on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of c7x43t/hello_cargo2 on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing c7x43t/hello_cargo2
[INFO] finished frobbing c7x43t/hello_cargo2
[INFO] frobbed toml for c7x43t/hello_cargo2 written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/c7x43t/hello_cargo2/Cargo.toml
[INFO] started frobbing c7x43t/hello_cargo2
[INFO] finished frobbing c7x43t/hello_cargo2
[INFO] frobbed toml for c7x43t/hello_cargo2 written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/c7x43t/hello_cargo2/Cargo.toml
[INFO] crate c7x43t/hello_cargo2 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking c7x43t/hello_cargo2 against master#452087b4bf18cece2d52d7cd8c9147195e5404bf for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-2/master#452087b4bf18cece2d52d7cd8c9147195e5404bf:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/c7x43t/hello_cargo2:/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" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 657093a84749657dee293992f931dd2e701bf0ae8593f1ca9368ee2bb65216d1
[INFO] running `"docker" "start" "-a" "657093a84749657dee293992f931dd2e701bf0ae8593f1ca9368ee2bb65216d1"`
[INFO] [stderr]    Compiling syn v0.15.35
[INFO] [stderr]    Compiling num-complex v0.2.2
[INFO] [stderr]     Checking alga v0.5.4
[INFO] [stderr]     Checking ndarray v0.12.1
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]     Checking sprs v0.6.4
[INFO] [stderr] warning[E0502]: cannot borrow `indptr` as immutable because it is also borrowed as mutable
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/sprs-0.6.4/src/sparse/triplet_iter.rs:122:26
[INFO] [stderr]     |
[INFO] [stderr] 122 |             indptr[i] += indptr[i - 1];
[INFO] [stderr]     |             -------------^^^^^^-------
[INFO] [stderr]     |             |            |
[INFO] [stderr]     |             |            immutable borrow occurs here
[INFO] [stderr]     |             mutable borrow occurs here
[INFO] [stderr]     |             mutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Checking hello_cargo2 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 37.62s
[INFO] running `"docker" "inspect" "657093a84749657dee293992f931dd2e701bf0ae8593f1ca9368ee2bb65216d1"`
[INFO] running `"docker" "rm" "-f" "657093a84749657dee293992f931dd2e701bf0ae8593f1ca9368ee2bb65216d1"`
[INFO] [stdout] 657093a84749657dee293992f931dd2e701bf0ae8593f1ca9368ee2bb65216d1