[INFO] crate paw-attributes 1.0.0 is already in cache
[INFO] extracting crate paw-attributes 1.0.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/paw-attributes/1.0.0
[INFO] extracting crate paw-attributes 1.0.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/paw-attributes/1.0.0
[INFO] validating manifest of paw-attributes-1.0.0 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 paw-attributes-1.0.0 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 paw-attributes-1.0.0
[INFO] finished frobbing paw-attributes-1.0.0
[INFO] frobbed toml for paw-attributes-1.0.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/paw-attributes/1.0.0/Cargo.toml
[INFO] started frobbing paw-attributes-1.0.0
[INFO] finished frobbing paw-attributes-1.0.0
[INFO] frobbed toml for paw-attributes-1.0.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/paw-attributes/1.0.0/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 paw-attributes-1.0.0 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/paw-attributes/1.0.0:/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] ec6c1a6fecb18f5de2bcbc9fb29206881e9a74e4d011ef16bd639640d3c86dac
[INFO] running `"docker" "start" "-a" "ec6c1a6fecb18f5de2bcbc9fb29206881e9a74e4d011ef16bd639640d3c86dac"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling paw-attributes v1.0.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.91s
[INFO] running `"docker" "inspect" "ec6c1a6fecb18f5de2bcbc9fb29206881e9a74e4d011ef16bd639640d3c86dac"`
[INFO] running `"docker" "rm" "-f" "ec6c1a6fecb18f5de2bcbc9fb29206881e9a74e4d011ef16bd639640d3c86dac"`
[INFO] [stdout] ec6c1a6fecb18f5de2bcbc9fb29206881e9a74e4d011ef16bd639640d3c86dac
[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/paw-attributes/1.0.0:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 98e91a065a789e151ef8e90f79625d42f882a15f0dc24061234a6e23310f053d
[INFO] running `"docker" "start" "-a" "98e91a065a789e151ef8e90f79625d42f882a15f0dc24061234a6e23310f053d"`
[INFO] [stderr]    Compiling paw-attributes v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0659]: `main` is ambiguous (built-in attribute vs any other name)
[INFO] [stderr]   |
[INFO] [stderr]   = note: `main` could refer to a built-in attribute
[INFO] [stderr] note: `main` could also refer to the crate-local procedural macro defined here
[INFO] [stderr]  --> src/lib.rs:16:1
[INFO] [stderr]   |
[INFO] [stderr] 16| / pub fn main(_attr: TokenStream, item: TokenStream) -> TokenStream {
[INFO] [stderr] 17| |     let input = syn::parse_macro_input!(item as syn::ItemFn);
[INFO] [stderr] 18| |
[INFO] [stderr] 19| |     let ret = &input.decl.output;
[INFO] [stderr] ... |
[INFO] [stderr] 76| |     result.into()
[INFO] [stderr] 77| | }
[INFO] [stderr]   | |_^
[INFO] [stderr]   = help: use `crate::main` to refer to this crate-local procedural macro unambiguously
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0659`.
[INFO] [stderr] error: Could not compile `paw-attributes`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "98e91a065a789e151ef8e90f79625d42f882a15f0dc24061234a6e23310f053d"`
[INFO] running `"docker" "rm" "-f" "98e91a065a789e151ef8e90f79625d42f882a15f0dc24061234a6e23310f053d"`
[INFO] [stdout] 98e91a065a789e151ef8e90f79625d42f882a15f0dc24061234a6e23310f053d