[INFO] crate serde_tuple 0.2.5 is already in cache
[INFO] extracting crate serde_tuple 0.2.5 into work/ex/beta-1.37-6/sources/1.36.0/reg/serde_tuple/0.2.5
[INFO] extracting crate serde_tuple 0.2.5 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_tuple/0.2.5
[INFO] validating manifest of serde_tuple-0.2.5 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of serde_tuple-0.2.5 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing serde_tuple-0.2.5
[INFO] finished frobbing serde_tuple-0.2.5
[INFO] frobbed toml for serde_tuple-0.2.5 written to work/ex/beta-1.37-6/sources/1.36.0/reg/serde_tuple/0.2.5/Cargo.toml
[INFO] started frobbing serde_tuple-0.2.5
[INFO] finished frobbing serde_tuple-0.2.5
[INFO] frobbed toml for serde_tuple-0.2.5 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_tuple/0.2.5/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing serde_tuple-0.2.5 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_tuple/0.2.5:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 4f36d5dc313bfaecd317423313a87f71df9291f96b1ecca13699ad0d4247c354
[INFO] running `"docker" "start" "-a" "4f36d5dc313bfaecd317423313a87f71df9291f96b1ecca13699ad0d4247c354"`
[INFO] [stderr]    Compiling serde_tuple v0.2.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.93s
[INFO] running `"docker" "inspect" "4f36d5dc313bfaecd317423313a87f71df9291f96b1ecca13699ad0d4247c354"`
[INFO] running `"docker" "rm" "-f" "4f36d5dc313bfaecd317423313a87f71df9291f96b1ecca13699ad0d4247c354"`
[INFO] [stdout] 4f36d5dc313bfaecd317423313a87f71df9291f96b1ecca13699ad0d4247c354
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_tuple/0.2.5:/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] b35792b57cc3dc16557786318c50221e0d0b746b8c4e0157b4c0c1d6f1ed9cde
[INFO] running `"docker" "start" "-a" "b35792b57cc3dc16557786318c50221e0d0b746b8c4e0157b4c0c1d6f1ed9cde"`
[INFO] [stderr]    Compiling serde_tuple v0.2.5 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::borrow::Cow`
[INFO] [stderr]  --> examples/simple.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::borrow::Cow;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `"docker" "inspect" "b35792b57cc3dc16557786318c50221e0d0b746b8c4e0157b4c0c1d6f1ed9cde"`
[INFO] running `"docker" "rm" "-f" "b35792b57cc3dc16557786318c50221e0d0b746b8c4e0157b4c0c1d6f1ed9cde"`
[INFO] [stdout] b35792b57cc3dc16557786318c50221e0d0b746b8c4e0157b4c0c1d6f1ed9cde
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_tuple/0.2.5:/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 1e555455d16d08ee0b7a9cc6e0db66fe2bdaaca3198feb2776425880ce30f8a6
[INFO] running `"docker" "start" "-a" "1e555455d16d08ee0b7a9cc6e0db66fe2bdaaca3198feb2776425880ce30f8a6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/serde_tuple-bc9198ec1500d341
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests serde_tuple
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stderr] 
[INFO] [stderr] thread 'rustc' has overflowed its stack
[INFO] [stderr] fatal runtime error: stack overflow
[INFO] [stderr] error: process didn't exit successfully: `rustdoc --edition=2018 --test /opt/crater/workdir/src/lib.rs --crate-name serde_tuple -L dependency=/opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern proc_macro2=/opt/crater/target/debug/deps/libproc_macro2-2aea07fc3d3d046a.rlib --extern quote=/opt/crater/target/debug/deps/libquote-6174f5eb7dc960bb.rlib --extern serde=/opt/crater/target/debug/deps/libserde-c55174c1f02a9342.rlib --extern serde_derive=/opt/crater/target/debug/deps/libserde_derive-33a91212eb58894d.so --extern serde_json=/opt/crater/target/debug/deps/libserde_json-86f23295433fb37c.rlib --extern serde_tuple=/opt/crater/target/debug/deps/libserde_tuple-32b6af9702e8cd8b.so --extern syn=/opt/crater/target/debug/deps/libsyn-896faa8358ddb7be.rlib` (signal: 6, SIGABRT: process abort signal)
[INFO] running `"docker" "inspect" "1e555455d16d08ee0b7a9cc6e0db66fe2bdaaca3198feb2776425880ce30f8a6"`
[INFO] running `"docker" "rm" "-f" "1e555455d16d08ee0b7a9cc6e0db66fe2bdaaca3198feb2776425880ce30f8a6"`
[INFO] [stdout] 1e555455d16d08ee0b7a9cc6e0db66fe2bdaaca3198feb2776425880ce30f8a6