[INFO] fetching crate r2d2_postgres 0.15.0-rc.1...
[INFO] extracting crate r2d2_postgres 0.15.0-rc.1 into work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/r2d2_postgres/0.15.0-rc.1
[INFO] extracting crate r2d2_postgres 0.15.0-rc.1 into work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/r2d2_postgres/0.15.0-rc.1
[INFO] validating manifest of r2d2_postgres-0.15.0-rc.1 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of r2d2_postgres-0.15.0-rc.1 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing r2d2_postgres-0.15.0-rc.1
[INFO] finished frobbing r2d2_postgres-0.15.0-rc.1
[INFO] frobbed toml for r2d2_postgres-0.15.0-rc.1 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/r2d2_postgres/0.15.0-rc.1/Cargo.toml
[INFO] started frobbing r2d2_postgres-0.15.0-rc.1
[INFO] finished frobbing r2d2_postgres-0.15.0-rc.1
[INFO] frobbed toml for r2d2_postgres-0.15.0-rc.1 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/r2d2_postgres/0.15.0-rc.1/Cargo.toml
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded postgres v0.16.0-rc.2
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking r2d2_postgres-0.15.0-rc.1 against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-2/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/r2d2_postgres/0.15.0-rc.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c87eabbdd8754bc5c048d6a885da914647684c20e8458105283e70d0f9a4d926
[INFO] running `"docker" "start" "-a" "c87eabbdd8754bc5c048d6a885da914647684c20e8458105283e70d0f9a4d926"`
[INFO] [stderr]     Checking rent_to_own v0.1.0
[INFO] [stderr]     Checking fallible-iterator v0.2.0
[INFO] [stderr]    Compiling darling_core v0.8.6
[INFO] [stderr]     Checking postgres-protocol v0.4.1
[INFO] [stderr]    Compiling darling_macro v0.8.6
[INFO] [stderr]    Compiling darling v0.8.6
[INFO] [stderr]    Compiling derive_state_machine_future v0.2.0
[INFO] [stderr]     Checking state_machine_future v0.2.0
[INFO] [stderr]     Checking tokio-postgres v0.4.0-rc.3
[INFO] [stderr] warning[E0381]: use of possibly uninitialized variable: `_`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-postgres-0.4.0-rc.3/src/proto/copy_in.rs:171:44
[INFO] [stderr]     |
[INFO] [stderr] 171 |               let buf: Box<dyn Buf + Send> = loop {
[INFO] [stderr]     |  ____________________________________________^
[INFO] [stderr] 172 | |                 match try_ready!(state.stream.poll().map_err(Error::copy_in_stream)) {
[INFO] [stderr] 173 | |                     Some(buf) => {
[INFO] [stderr] 174 | |                         let buf = buf.into_buf();
[INFO] [stderr] ...   |
[INFO] [stderr] 191 | |                 }
[INFO] [stderr] 192 | |             };
[INFO] [stderr]     | |_____________^ use of possibly uninitialized value
[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 postgres v0.16.0-rc.2
[INFO] [stderr]     Checking r2d2_postgres v0.15.0-rc.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.12s
[INFO] running `"docker" "inspect" "c87eabbdd8754bc5c048d6a885da914647684c20e8458105283e70d0f9a4d926"`
[INFO] running `"docker" "rm" "-f" "c87eabbdd8754bc5c048d6a885da914647684c20e8458105283e70d0f9a4d926"`
[INFO] [stdout] c87eabbdd8754bc5c048d6a885da914647684c20e8458105283e70d0f9a4d926