[INFO] crate serde_tuple 0.5.0 is already in cache
[INFO] testing serde_tuple-0.5.0 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate serde_tuple 0.5.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate serde_tuple 0.5.0 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate serde_tuple 0.5.0
[INFO] finished tweaking crates.io crate serde_tuple 0.5.0
[INFO] tweaked toml for crates.io crate serde_tuple 0.5.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate serde_tuple 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] aabab8e10c6fe5a1c85f5ca0381d5d9a10c67c556f9f000303990c3a57ac530a
[INFO] running `"docker" "start" "-a" "aabab8e10c6fe5a1c85f5ca0381d5d9a10c67c556f9f000303990c3a57ac530a"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling proc-macro2 v1.0.7
[INFO] [stderr]    Compiling syn v0.15.36
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]    Compiling serde v1.0.92
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling serde_tuple_macros v0.5.0
[INFO] [stderr]    Compiling serde_tuple v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.01s
[INFO] running `"docker" "inspect" "aabab8e10c6fe5a1c85f5ca0381d5d9a10c67c556f9f000303990c3a57ac530a"`
[INFO] running `"docker" "rm" "-f" "aabab8e10c6fe5a1c85f5ca0381d5d9a10c67c556f9f000303990c3a57ac530a"`
[INFO] [stdout] aabab8e10c6fe5a1c85f5ca0381d5d9a10c67c556f9f000303990c3a57ac530a
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stdout] 2162b75a8a5c180915148d1b97afe8068aacf2f51d5966ed1ae389f8db38df20
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "2162b75a8a5c180915148d1b97afe8068aacf2f51d5966ed1ae389f8db38df20"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ryu v0.2.8
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling serde_tuple v0.5.0 (/opt/rustwide/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] warning: struct is never constructed: `Ok`
[INFO] [stderr]   --> examples/simple.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct Ok;
[INFO] [stderr]    |        ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 5.81s
[INFO] running `"docker" "inspect" "2162b75a8a5c180915148d1b97afe8068aacf2f51d5966ed1ae389f8db38df20"`
[INFO] running `"docker" "rm" "-f" "2162b75a8a5c180915148d1b97afe8068aacf2f51d5966ed1ae389f8db38df20"`
[INFO] [stdout] 2162b75a8a5c180915148d1b97afe8068aacf2f51d5966ed1ae389f8db38df20
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stdout] 0f4a996e96cd872bef54da956900519df3a9e18f2a70cdccf918cdbda75d9f9d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "0f4a996e96cd872bef54da956900519df3a9e18f2a70cdccf918cdbda75d9f9d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[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] warning: struct is never constructed: `Ok`
[INFO] [stderr]   --> examples/simple.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct Ok;
[INFO] [stderr]    |        ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/serde_tuple-49e90787c9d05fa1
[INFO] [stderr]    Doc-tests serde_tuple
[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] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs -  (line 5) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs -  (line 5) stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'rustc' has overflowed its stack
[INFO] [stdout] fatal runtime error: stack overflow
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs -  (line 5)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "0f4a996e96cd872bef54da956900519df3a9e18f2a70cdccf918cdbda75d9f9d"`
[INFO] running `"docker" "rm" "-f" "0f4a996e96cd872bef54da956900519df3a9e18f2a70cdccf918cdbda75d9f9d"`
[INFO] [stdout] 0f4a996e96cd872bef54da956900519df3a9e18f2a70cdccf918cdbda75d9f9d