[INFO] updating cached repository https://github.com/calebwin/fern
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9e5da73a0152faa92f4cf96b504e42d82d9448f4
[INFO] checking calebwin/fern against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcalebwin%2Ffern" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/calebwin/fern on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/calebwin/fern
[INFO] finished tweaking git repo https://github.com/calebwin/fern
[INFO] tweaked toml for git repo https://github.com/calebwin/fern written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/calebwin/fern already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1400c3498723f779d949a0a6adab29cb204309fe338d342589c19b9b89d97253
[INFO] running `"docker" "start" "-a" "1400c3498723f779d949a0a6adab29cb204309fe338d342589c19b9b89d97253"`
[INFO] [stderr]    Compiling cc v1.0.29
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]     Checking error-chain v0.12.0
[INFO] [stderr]     Checking rsmt2 v0.10.0
[INFO] [stderr]     Checking fern v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `SmtRes`
[INFO] [stderr]  --> src/main.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rsmt2::{SmtRes, Solver};
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SmtRes`
[INFO] [stderr]  --> src/main.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rsmt2::{SmtRes, Solver};
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `rsmt2::example::simple::Cst` doesn't implement `std::fmt::Debug`
[INFO] [stderr]   --> src/main.rs:32:26
[INFO] [stderr]    |
[INFO] [stderr] 32 |         println!("{:?}", model);
[INFO] [stderr]    |                          ^^^^^ `rsmt2::example::simple::Cst` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::fmt::Debug` is not implemented for `rsmt2::example::simple::Cst`
[INFO] [stderr]    = note: required because of the requirements on the impl of `std::fmt::Debug` for `(std::string::String, std::string::String, rsmt2::example::simple::Cst)`
[INFO] [stderr]    = note: required because of the requirements on the impl of `std::fmt::Debug` for `std::vec::Vec<(std::string::String, std::string::String, rsmt2::example::simple::Cst)>`
[INFO] [stderr]    = note: required by `std::fmt::Debug::fmt`
[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[E0277]: `rsmt2::example::simple::Cst` doesn't implement `std::fmt::Debug`
[INFO] [stderr]   --> src/main.rs:32:26
[INFO] [stderr]    |
[INFO] [stderr] 32 |         println!("{:?}", model);
[INFO] [stderr]    |                          ^^^^^ `rsmt2::example::simple::Cst` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::fmt::Debug` is not implemented for `rsmt2::example::simple::Cst`
[INFO] [stderr]    = note: required because of the requirements on the impl of `std::fmt::Debug` for `(std::string::String, std::string::String, rsmt2::example::simple::Cst)`
[INFO] [stderr]    = note: required because of the requirements on the impl of `std::fmt::Debug` for `std::vec::Vec<(std::string::String, std::string::String, rsmt2::example::simple::Cst)>`
[INFO] [stderr]    = note: required by `std::fmt::Debug::fmt`
[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; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `fern`.
[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] error: could not compile `fern`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1400c3498723f779d949a0a6adab29cb204309fe338d342589c19b9b89d97253"`
[INFO] running `"docker" "rm" "-f" "1400c3498723f779d949a0a6adab29cb204309fe338d342589c19b9b89d97253"`
[INFO] [stdout] 1400c3498723f779d949a0a6adab29cb204309fe338d342589c19b9b89d97253