[INFO] crate proc-macro-rules 0.2.1 is already in cache
[INFO] extracting crate proc-macro-rules 0.2.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/proc-macro-rules/0.2.1
[INFO] extracting crate proc-macro-rules 0.2.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/proc-macro-rules/0.2.1
[INFO] validating manifest of proc-macro-rules-0.2.1 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 proc-macro-rules-0.2.1 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 proc-macro-rules-0.2.1
[INFO] removed 1 missing examples
[INFO] finished frobbing proc-macro-rules-0.2.1
[INFO] frobbed toml for proc-macro-rules-0.2.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/proc-macro-rules/0.2.1/Cargo.toml
[INFO] started frobbing proc-macro-rules-0.2.1
[INFO] removed 1 missing examples
[INFO] finished frobbing proc-macro-rules-0.2.1
[INFO] frobbed toml for proc-macro-rules-0.2.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/proc-macro-rules/0.2.1/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 proc-macro-rules-0.2.1 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/proc-macro-rules/0.2.1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f93f70f799e94314b1a04705e816894fc8b7ce48c35c3177cf7a4d4a4f5c4133
[INFO] running `"docker" "start" "-a" "f93f70f799e94314b1a04705e816894fc8b7ce48c35c3177cf7a4d4a4f5c4133"`
[INFO] [stderr]    Compiling proc-macro-rules-macros v0.2.0
[INFO] [stderr]    Compiling proc-macro-rules v0.2.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.37s
[INFO] running `"docker" "inspect" "f93f70f799e94314b1a04705e816894fc8b7ce48c35c3177cf7a4d4a4f5c4133"`
[INFO] running `"docker" "rm" "-f" "f93f70f799e94314b1a04705e816894fc8b7ce48c35c3177cf7a4d4a4f5c4133"`
[INFO] [stdout] f93f70f799e94314b1a04705e816894fc8b7ce48c35c3177cf7a4d4a4f5c4133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/proc-macro-rules/0.2.1:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 849486be41ba9fd8e4d80748990d18e77dec62ffcfc43271b2e1a6075b44330f
[INFO] running `"docker" "start" "-a" "849486be41ba9fd8e4d80748990d18e77dec62ffcfc43271b2e1a6075b44330f"`
[INFO] [stderr]    Compiling proc-macro-rules v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
[INFO] [stderr]   --> examples/macro_rules.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | #[proc_macro]
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `macro_rules`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `examples/macro_rules.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: Could not compile `proc-macro-rules`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "849486be41ba9fd8e4d80748990d18e77dec62ffcfc43271b2e1a6075b44330f"`
[INFO] running `"docker" "rm" "-f" "849486be41ba9fd8e4d80748990d18e77dec62ffcfc43271b2e1a6075b44330f"`
[INFO] [stdout] 849486be41ba9fd8e4d80748990d18e77dec62ffcfc43271b2e1a6075b44330f