[INFO] fetching crate rt_map 0.5.2...
[INFO] checking rt_map-0.5.2 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate rt_map 0.5.2 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate rt_map 0.5.2 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] removed /workspace/builds/worker-1-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate rt_map 0.5.2
[INFO] finished tweaking crates.io crate rt_map 0.5.2
[INFO] tweaked toml for crates.io crate rt_map 0.5.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate rt_map 0.5.2 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 rt_ref v0.2.0
[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] a07564fb41044efb463030acb1807f6968c5808759981cf02cb0a1a32a136d4b
[INFO] running `Command { std: "docker" "start" "-a" "a07564fb41044efb463030acb1807f6968c5808759981cf02cb0a1a32a136d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a07564fb41044efb463030acb1807f6968c5808759981cf02cb0a1a32a136d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a07564fb41044efb463030acb1807f6968c5808759981cf02cb0a1a32a136d4b", kill_on_drop: false }`
[INFO] [stdout] a07564fb41044efb463030acb1807f6968c5808759981cf02cb0a1a32a136d4b
[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] ac916348666750205996de8795c280066b5c5fc29012cd105a5681973d3a8682
[INFO] running `Command { std: "docker" "start" "-a" "ac916348666750205996de8795c280066b5c5fc29012cd105a5681973d3a8682", kill_on_drop: false }`
[INFO] [stderr]     Checking rt_ref v0.2.0
[INFO] [stderr]     Checking rt_map v0.5.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "ac916348666750205996de8795c280066b5c5fc29012cd105a5681973d3a8682", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac916348666750205996de8795c280066b5c5fc29012cd105a5681973d3a8682", kill_on_drop: false }`
[INFO] [stdout] ac916348666750205996de8795c280066b5c5fc29012cd105a5681973d3a8682
[INFO] checking rt_map-0.5.2 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate rt_map 0.5.2 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate rt_map 0.5.2 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate rt_map 0.5.2
[INFO] finished tweaking crates.io crate rt_map 0.5.2
[INFO] tweaked toml for crates.io crate rt_map 0.5.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate rt_map 0.5.2 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90f33e8c9cc494e8a1e053ffe627607005cafb46aba8794afa9edf13ff6eac2e
[INFO] running `Command { std: "docker" "start" "-a" "90f33e8c9cc494e8a1e053ffe627607005cafb46aba8794afa9edf13ff6eac2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90f33e8c9cc494e8a1e053ffe627607005cafb46aba8794afa9edf13ff6eac2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90f33e8c9cc494e8a1e053ffe627607005cafb46aba8794afa9edf13ff6eac2e", kill_on_drop: false }`
[INFO] [stdout] 90f33e8c9cc494e8a1e053ffe627607005cafb46aba8794afa9edf13ff6eac2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ddcc9985c681828790955d3c82ab2caa16f359807cadc31f5d72d0a68f7ea2b
[INFO] running `Command { std: "docker" "start" "-a" "9ddcc9985c681828790955d3c82ab2caa16f359807cadc31f5d72d0a68f7ea2b", kill_on_drop: false }`
[INFO] [stderr]     Checking rt_ref v0.2.0
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rt_ref-0.2.0/src/cell.rs:9:54
[INFO] [stdout]    |
[INFO] [stdout] 9  |       ($borrow_wanted:expr, $borrow_existing:expr) => {{
[INFO] [stdout]    |  ______________________________________________________^
[INFO] [stdout] 10 | |         panic!(
[INFO] [stdout] 11 | |             "Expected to borrow `{type_name}` {borrow_wanted}, but it was already borrowed{borrow_existing}.",
[INFO] [stdout] 12 | |             type_name = ::std::any::type_name::<T>(),
[INFO] [stdout] ...  |
[INFO] [stdout] 15 | |         )
[INFO] [stdout] 16 | |     }};
[INFO] [stdout]    | |_____^ cannot infer type
[INFO] [stdout] ...
[INFO] [stdout] 50 |               borrow_panic!("immutably", " mutably");
[INFO] [stdout]    |               -------------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `borrow_panic` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rt_ref` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9ddcc9985c681828790955d3c82ab2caa16f359807cadc31f5d72d0a68f7ea2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ddcc9985c681828790955d3c82ab2caa16f359807cadc31f5d72d0a68f7ea2b", kill_on_drop: false }`
[INFO] [stdout] 9ddcc9985c681828790955d3c82ab2caa16f359807cadc31f5d72d0a68f7ea2b