[INFO] crate tango-client 0.1.1 is already in cache
[INFO] extracting crate tango-client 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/tango-client/0.1.1
[INFO] extracting crate tango-client 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tango-client/0.1.1
[INFO] validating manifest of tango-client-0.1.1 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tango-client-0.1.1 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tango-client-0.1.1
[INFO] finished frobbing tango-client-0.1.1
[INFO] frobbed toml for tango-client-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/tango-client/0.1.1/Cargo.toml
[INFO] started frobbing tango-client-0.1.1
[INFO] finished frobbing tango-client-0.1.1
[INFO] frobbed toml for tango-client-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tango-client/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing tango-client-0.1.1 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/tango-client/0.1.1:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] fdb387e6d57fd9116bdf70e49474565f4b98384785be6410c4b860ef10c25092
[INFO] running `"docker" "start" "-a" "fdb387e6d57fd9116bdf70e49474565f4b98384785be6410c4b860ef10c25092"`
[INFO] [stderr]    Compiling tango-client-sys v0.1.1
[INFO] [stderr] error: failed to run custom build command for `tango-client-sys v0.1.1`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/tango-client-sys-b90c5f0a701a4464/build-script-build` (exit code: 1)
[INFO] [stderr] --- stdout
[INFO] [stderr] `"pkg-config" "--libs" "--cflags" "tango"` did not exit successfully: exit code: 1
[INFO] [stderr] --- stderr
[INFO] [stderr] Package tango was not found in the pkg-config search path.
[INFO] [stderr] Perhaps you should add the directory containing `tango.pc'
[INFO] [stderr] to the PKG_CONFIG_PATH environment variable
[INFO] [stderr] No package 'tango' found
[INFO] [stderr] ---
[INFO] running `"docker" "inspect" "fdb387e6d57fd9116bdf70e49474565f4b98384785be6410c4b860ef10c25092"`
[INFO] running `"docker" "rm" "-f" "fdb387e6d57fd9116bdf70e49474565f4b98384785be6410c4b860ef10c25092"`
[INFO] [stdout] fdb387e6d57fd9116bdf70e49474565f4b98384785be6410c4b860ef10c25092