[INFO] fetching crate guard_let 0.1.2...
[INFO] checking guard_let-0.1.2 against try#6024cfef3a82f9a7688f07054f1650081bad3af5 for pr-74130
[INFO] extracting crate guard_let 0.1.2 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate guard_let 0.1.2 on toolchain 6024cfef3a82f9a7688f07054f1650081bad3af5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate guard_let 0.1.2
[INFO] finished tweaking crates.io crate guard_let 0.1.2
[INFO] tweaked toml for crates.io crate guard_let 0.1.2 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pmutil v0.5.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e2f2506286c41d871c250c766c60776576a27d21fb4c51665d107e598e4d4057
[INFO] running `Command { std: "docker" "start" "-a" "e2f2506286c41d871c250c766c60776576a27d21fb4c51665d107e598e4d4057", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e2f2506286c41d871c250c766c60776576a27d21fb4c51665d107e598e4d4057", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2f2506286c41d871c250c766c60776576a27d21fb4c51665d107e598e4d4057", kill_on_drop: false }`
[INFO] [stdout] e2f2506286c41d871c250c766c60776576a27d21fb4c51665d107e598e4d4057
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 66751b94b54c25bb44d458c81e0d61a802ce8be42e47887a83e8c514ea2ffd62
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "66751b94b54c25bb44d458c81e0d61a802ce8be42e47887a83e8c514ea2ffd62", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]     Checking unicode-xid v0.2.1
[INFO] [stderr]     Checking proc-macro2 v1.0.18
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]     Checking pmutil v0.5.3
[INFO] [stderr]     Checking guard_let v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: `Enum` doesn't implement `std::fmt::Debug`
[INFO] [stdout]   --> tests/usage.rs:21:38
[INFO] [stdout]    |
[INFO] [stdout] 21 |         println!("v is not A: {:?}", v);
[INFO] [stdout]    |                                      ^ `Enum` cannot be formatted using `{:?}`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::fmt::Debug` is not implemented for `Enum`
[INFO] [stdout]    = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
[INFO] [stdout]    = note: required by `std::fmt::Debug::fmt`
[INFO] [stdout]    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `Enum` doesn't implement `std::fmt::Debug`
[INFO] [stdout]   --> tests/usage.rs:35:38
[INFO] [stdout]    |
[INFO] [stdout] 35 |         println!("v is not C: {:?}", v);
[INFO] [stdout]    |                                      ^ `Enum` cannot be formatted using `{:?}`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::fmt::Debug` is not implemented for `Enum`
[INFO] [stdout]    = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
[INFO] [stdout]    = note: required by `std::fmt::Debug::fmt`
[INFO] [stdout]    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `guard_let`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "66751b94b54c25bb44d458c81e0d61a802ce8be42e47887a83e8c514ea2ffd62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66751b94b54c25bb44d458c81e0d61a802ce8be42e47887a83e8c514ea2ffd62", kill_on_drop: false }`
[INFO] [stdout] 66751b94b54c25bb44d458c81e0d61a802ce8be42e47887a83e8c514ea2ffd62