[INFO] fetching crate unwrap-print 0.2.0...
[INFO] testing unwrap-print-0.2.0 against 1.99.0-beta.8 for beta-1.100-2
[INFO] extracting crate unwrap-print 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] removed /workspace/builds/worker-7-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate unwrap-print 0.2.0
[INFO] finished tweaking crates.io crate unwrap-print 0.2.0
[INFO] tweaked toml for crates.io crate unwrap-print 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unwrap-print 0.2.0 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate unwrap-print 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6
[INFO] running `Command { std: "docker" "start" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling unwrap-print v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling unwrap-print v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `is_err` found for enum `Option<T>` in the current scope
[INFO] [stdout]    --> src/lib.rs:397:21
[INFO] [stdout]     |
[INFO] [stdout] 397 |         assert!(res.is_err());
[INFO] [stdout]     |                     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: there is a method `iter` with a similar name
[INFO] [stdout]     |
[INFO] [stdout] 397 -         assert!(res.is_err());
[INFO] [stdout] 397 +         assert!(res.iter());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unwrap-print` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6", kill_on_drop: false }`
[INFO] [stdout] 3b66ab7146935b03b3727df4ba5c89bf832df8e20f5736678aeaa4ae315592a6
