[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 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] fa7342d47b2f2669b2ebdbff064d115421cccf75c9341e5da3be54e57d7e1978
[INFO] running `"docker" "start" "-a" "fa7342d47b2f2669b2ebdbff064d115421cccf75c9341e5da3be54e57d7e1978"`
[INFO] [stderr]    Compiling serde_tuple v0.2.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.77s
[INFO] running `"docker" "inspect" "fa7342d47b2f2669b2ebdbff064d115421cccf75c9341e5da3be54e57d7e1978"`
[INFO] running `"docker" "rm" "-f" "fa7342d47b2f2669b2ebdbff064d115421cccf75c9341e5da3be54e57d7e1978"`
[INFO] [stdout] fa7342d47b2f2669b2ebdbff064d115421cccf75c9341e5da3be54e57d7e1978
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 3e99affe9d90d7b90f9b45911fdfd4793f9811302a30e20226d145269cc8274e
[INFO] running `"docker" "start" "-a" "3e99affe9d90d7b90f9b45911fdfd4793f9811302a30e20226d145269cc8274e"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[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 1.14s
[INFO] running `"docker" "inspect" "3e99affe9d90d7b90f9b45911fdfd4793f9811302a30e20226d145269cc8274e"`
[INFO] running `"docker" "rm" "-f" "3e99affe9d90d7b90f9b45911fdfd4793f9811302a30e20226d145269cc8274e"`
[INFO] [stdout] 3e99affe9d90d7b90f9b45911fdfd4793f9811302a30e20226d145269cc8274e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 45aa7e37d7152106a7d13415835dd7e25fec3405af2ce36e28765ea3255b2758
[INFO] running `"docker" "start" "-a" "45aa7e37d7152106a7d13415835dd7e25fec3405af2ce36e28765ea3255b2758"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/serde_tuple-83c777153a42d4df
[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_macro2-18fd6f71a2fc2b6f.rlib --extern quote=/opt/crater/target/debug/deps/libquote-bbb9336e7901af9b.rlib --extern serde=/opt/crater/target/debug/deps/libserde-f4ad0cdcf3ae7a20.rlib --extern serde_derive=/opt/crater/target/debug/deps/libserde_derive-7d503ff943f67474.so --extern serde_json=/opt/crater/target/debug/deps/libserde_json-905e72386a5f800f.rlib --extern serde_tuple=/opt/crater/target/debug/deps/libserde_tuple-96c9e0600e8f1504.so --extern syn=/opt/crater/target/debug/deps/libsyn-cb02dd882811c4e3.rlib` (signal: 6, SIGABRT: process abort signal)
[INFO] running `"docker" "inspect" "45aa7e37d7152106a7d13415835dd7e25fec3405af2ce36e28765ea3255b2758"`
[INFO] running `"docker" "rm" "-f" "45aa7e37d7152106a7d13415835dd7e25fec3405af2ce36e28765ea3255b2758"`
[INFO] [stdout] 45aa7e37d7152106a7d13415835dd7e25fec3405af2ce36e28765ea3255b2758