[INFO] fetching crate serde-ext-macros 0.1.1...
[INFO] extracting crate serde-ext-macros 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/serde-ext-macros/0.1.1
[INFO] extracting crate serde-ext-macros 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde-ext-macros/0.1.1
[INFO] validating manifest of serde-ext-macros-0.1.1 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-ext-macros-0.1.1 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-ext-macros-0.1.1
[INFO] finished frobbing serde-ext-macros-0.1.1
[INFO] frobbed toml for serde-ext-macros-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/serde-ext-macros/0.1.1/Cargo.toml
[INFO] started frobbing serde-ext-macros-0.1.1
[INFO] finished frobbing serde-ext-macros-0.1.1
[INFO] frobbed toml for serde-ext-macros-0.1.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde-ext-macros/0.1.1/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-ext-macros-0.1.1 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-ext-macros/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] e7dd80f1a049e0e141c80ef4d4c79bdca3faa8b7291b9edf09fc9f83cb5e1eb3
[INFO] running `"docker" "start" "-a" "e7dd80f1a049e0e141c80ef4d4c79bdca3faa8b7291b9edf09fc9f83cb5e1eb3"`
[INFO] [stderr]    Compiling serde-ext-macros v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `out`
[INFO] [stderr]   --> src/lib.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let out = item.clone();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_out`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `attrs`
[INFO] [stderr]   --> src/lib.rs:10:21
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn extend_serde(attrs: TokenStream, item: TokenStream) -> TokenStream {
[INFO] [stderr]    |                     ^^^^^ help: consider prefixing with an underscore: `_attrs`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.31s
[INFO] running `"docker" "inspect" "e7dd80f1a049e0e141c80ef4d4c79bdca3faa8b7291b9edf09fc9f83cb5e1eb3"`
[INFO] running `"docker" "rm" "-f" "e7dd80f1a049e0e141c80ef4d4c79bdca3faa8b7291b9edf09fc9f83cb5e1eb3"`
[INFO] [stdout] e7dd80f1a049e0e141c80ef4d4c79bdca3faa8b7291b9edf09fc9f83cb5e1eb3
[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-ext-macros/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 47052106cb59c52281cdce14433ac393263a33d6543497b60f39e83d73ea2178
[INFO] running `"docker" "start" "-a" "47052106cb59c52281cdce14433ac393263a33d6543497b60f39e83d73ea2178"`
[INFO] [stderr]    Compiling serde-ext-macros v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `out`
[INFO] [stderr]   --> src/lib.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let out = item.clone();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_out`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `attrs`
[INFO] [stderr]   --> src/lib.rs:10:21
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn extend_serde(attrs: TokenStream, item: TokenStream) -> TokenStream {
[INFO] [stderr]    |                     ^^^^^ help: consider prefixing with an underscore: `_attrs`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "47052106cb59c52281cdce14433ac393263a33d6543497b60f39e83d73ea2178"`
[INFO] running `"docker" "rm" "-f" "47052106cb59c52281cdce14433ac393263a33d6543497b60f39e83d73ea2178"`
[INFO] [stdout] 47052106cb59c52281cdce14433ac393263a33d6543497b60f39e83d73ea2178
[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-ext-macros/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 21a1e12e9c4a10a64c1a1415234e7e0750e4eaad39beff0696d2a4ccbbf9654f
[INFO] running `"docker" "start" "-a" "21a1e12e9c4a10a64c1a1415234e7e0750e4eaad39beff0696d2a4ccbbf9654f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/serde_ext_macros-ae55e1fc8f8f9fba
[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-ext-macros
[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] running `"docker" "inspect" "21a1e12e9c4a10a64c1a1415234e7e0750e4eaad39beff0696d2a4ccbbf9654f"`
[INFO] running `"docker" "rm" "-f" "21a1e12e9c4a10a64c1a1415234e7e0750e4eaad39beff0696d2a4ccbbf9654f"`
[INFO] [stdout] 21a1e12e9c4a10a64c1a1415234e7e0750e4eaad39beff0696d2a4ccbbf9654f