[INFO] fetching crate mfa-cli 0.2.1...
[INFO] checking mfa-cli-0.2.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate mfa-cli 0.2.1 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate mfa-cli 0.2.1 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mfa-cli 0.2.1
[INFO] finished tweaking crates.io crate mfa-cli 0.2.1
[INFO] tweaked toml for crates.io crate mfa-cli 0.2.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate mfa-cli 0.2.1 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded generic-array v0.14.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b7b898f878b97d0df5c0ea5c94b0f6b85e54ee141a426d1fddcdd1a738f69a99
[INFO] running `Command { std: "docker" "start" "-a" "b7b898f878b97d0df5c0ea5c94b0f6b85e54ee141a426d1fddcdd1a738f69a99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7b898f878b97d0df5c0ea5c94b0f6b85e54ee141a426d1fddcdd1a738f69a99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7b898f878b97d0df5c0ea5c94b0f6b85e54ee141a426d1fddcdd1a738f69a99", kill_on_drop: false }`
[INFO] [stdout] b7b898f878b97d0df5c0ea5c94b0f6b85e54ee141a426d1fddcdd1a738f69a99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b1b94f05400f10674827501fa6e67f7951f62d9fe174450bae6a4107b9c58262
[INFO] running `Command { std: "docker" "start" "-a" "b1b94f05400f10674827501fa6e67f7951f62d9fe174450bae6a4107b9c58262", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.17
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.23
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking generic-array v0.14.1
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking mfa-cli v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:163:32
[INFO] [stdout]     |
[INFO] [stdout] 163 |             Err(err) => panic!(err),
[INFO] [stdout]     |                                ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]     |
[INFO] [stdout] 163 |             Err(err) => panic!("{}", err),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:163:32
[INFO] [stdout]     |
[INFO] [stdout] 163 |             Err(err) => panic!(err),
[INFO] [stdout]     |                                ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]     |
[INFO] [stdout] 163 |             Err(err) => panic!("{}", err),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.46s
[INFO] running `Command { std: "docker" "inspect" "b1b94f05400f10674827501fa6e67f7951f62d9fe174450bae6a4107b9c58262", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1b94f05400f10674827501fa6e67f7951f62d9fe174450bae6a4107b9c58262", kill_on_drop: false }`
[INFO] [stdout] b1b94f05400f10674827501fa6e67f7951f62d9fe174450bae6a4107b9c58262