[INFO] fetching crate next-gen 0.0.10...
[INFO] checking next-gen-0.0.10 against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] extracting crate next-gen 0.0.10 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate next-gen 0.0.10 on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate next-gen 0.0.10
[INFO] finished tweaking crates.io crate next-gen 0.0.10
[INFO] tweaked toml for crates.io crate next-gen 0.0.10 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=forbid" "-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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] aa426d757255b139914d86e89f0a7eac75a0429f7db6617a8a34f6be5ef29bb0
[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" "aa426d757255b139914d86e89f0a7eac75a0429f7db6617a8a34f6be5ef29bb0"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling fstrings-proc-macro v0.2.3
[INFO] [stderr]    Compiling fstrings v0.2.3
[INFO] [stderr]    Compiling next-gen_proc-macro v0.0.10
[INFO] [stderr]     Checking next-gen v0.0.10 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/tests.rs:212:21
[INFO] [stderr]     |
[INFO] [stderr] 208 | /                     loop {
[INFO] [stderr] 209 | |                         yield_!(current);
[INFO] [stderr] 210 | |                         current = current.checked_sub(1)?;
[INFO] [stderr] 211 | |                     }
[INFO] [stderr]     | |_____________________- any code following this expression is unreachable
[INFO] [stderr] 212 |                       None
[INFO] [stderr]     |                       ^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read tests/../src/proc_macro/doc_examples/generator.rs: No such file or directory (os error 2)
[INFO] [stderr]   --> tests/proc_macro.rs:8:17
[INFO] [stderr]    |
[INFO] [stderr] 8  | /                 include! {
[INFO] [stderr] 9  | |                     concat!(
[INFO] [stderr] 10 | |                         "../src/proc_macro/doc_examples/",
[INFO] [stderr] 11 | |                         stringify!($ident),
[INFO] [stderr] 12 | |                         ".rs",
[INFO] [stderr] 13 | |                     )
[INFO] [stderr] 14 | |                 }
[INFO] [stderr]    | |_________________^
[INFO] [stderr] ...
[INFO] [stderr] 19 | /     test_include! {
[INFO] [stderr] 20 | |         generator,
[INFO] [stderr] 21 | |         generator_desugared,
[INFO] [stderr] 22 | |     }
[INFO] [stderr]    | |_____- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `next-gen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: function is never used: `return_iterator_with_concrete_dyn_type`
[INFO] [stderr]    --> src/tests.rs:190:8
[INFO] [stderr]     |
[INFO] [stderr] 190 |     fn return_iterator_with_concrete_dyn_type ()
[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] error: build failed
[INFO] running `"docker" "inspect" "aa426d757255b139914d86e89f0a7eac75a0429f7db6617a8a34f6be5ef29bb0"`
[INFO] running `"docker" "rm" "-f" "aa426d757255b139914d86e89f0a7eac75a0429f7db6617a8a34f6be5ef29bb0"`
[INFO] [stdout] aa426d757255b139914d86e89f0a7eac75a0429f7db6617a8a34f6be5ef29bb0