[INFO] cloning repository https://github.com/AlexanderSchuetz97/rco-cell
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AlexanderSchuetz97/rco-cell" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6b3619239a74883bf65adb1d64ed766d6d3d645
[INFO] checking AlexanderSchuetz97/rco-cell against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AlexanderSchuetz97/rco-cell 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 git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] finished tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] tweaked toml for git repo https://github.com/AlexanderSchuetz97/rco-cell written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/AlexanderSchuetz97/rco-cell 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 4ff2d9a5071b879c4a9829d5556d80dcee577f830bbac27a599d9850eb73876b
[INFO] running `Command { std: "docker" "start" "-a" "4ff2d9a5071b879c4a9829d5556d80dcee577f830bbac27a599d9850eb73876b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ff2d9a5071b879c4a9829d5556d80dcee577f830bbac27a599d9850eb73876b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ff2d9a5071b879c4a9829d5556d80dcee577f830bbac27a599d9850eb73876b", kill_on_drop: false }`
[INFO] [stdout] 4ff2d9a5071b879c4a9829d5556d80dcee577f830bbac27a599d9850eb73876b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 0fc07b0c5ec01b1cd4d6575f9d5eaf32f1214e5b374e52de58f363be2b293098
[INFO] running `Command { std: "docker" "start" "-a" "0fc07b0c5ec01b1cd4d6575f9d5eaf32f1214e5b374e52de58f363be2b293098", kill_on_drop: false }`
[INFO] [stderr]     Checking rco-cell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1045:9
[INFO] [stdout]      |
[INFO] [stdout] 1045 |     use std::cell::RefCell;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `RefCell` is already imported here
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1048:9
[INFO] [stdout]      |
[INFO] [stdout] 1048 |     use std::rc::Rc;
[INFO] [stdout]      |         ^^^^^^^^^^^
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `Rc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "0fc07b0c5ec01b1cd4d6575f9d5eaf32f1214e5b374e52de58f363be2b293098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fc07b0c5ec01b1cd4d6575f9d5eaf32f1214e5b374e52de58f363be2b293098", kill_on_drop: false }`
[INFO] [stdout] 0fc07b0c5ec01b1cd4d6575f9d5eaf32f1214e5b374e52de58f363be2b293098
[INFO] checking AlexanderSchuetz97/rco-cell against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AlexanderSchuetz97/rco-cell 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] started tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] finished tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] tweaked toml for git repo https://github.com/AlexanderSchuetz97/rco-cell written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/AlexanderSchuetz97/rco-cell 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 1ce9586c68817cd9206731a9cce894f615a77e4039f88c1bdbc31acf17eed817
[INFO] running `Command { std: "docker" "start" "-a" "1ce9586c68817cd9206731a9cce894f615a77e4039f88c1bdbc31acf17eed817", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ce9586c68817cd9206731a9cce894f615a77e4039f88c1bdbc31acf17eed817", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ce9586c68817cd9206731a9cce894f615a77e4039f88c1bdbc31acf17eed817", kill_on_drop: false }`
[INFO] [stdout] 1ce9586c68817cd9206731a9cce894f615a77e4039f88c1bdbc31acf17eed817
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] b006868471009dc807ee5d936bd7b50aad9f535eb858147ad6ff382b2f298496
[INFO] running `Command { std: "docker" "start" "-a" "b006868471009dc807ee5d936bd7b50aad9f535eb858147ad6ff382b2f298496", kill_on_drop: false }`
[INFO] [stderr]     Checking rco-cell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1045:9
[INFO] [stdout]      |
[INFO] [stdout] 1045 |     use std::cell::RefCell;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `RefCell` is already imported here
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1048:9
[INFO] [stdout]      |
[INFO] [stdout] 1048 |     use std::rc::Rc;
[INFO] [stdout]      |         ^^^^^^^^^^^
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `Rc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed for `Result<R, Box<dyn Any + Send>>`
[INFO] [stdout]     --> src/lib.rs:1212:13
[INFO] [stdout]      |
[INFO] [stdout] 1212 |           let r = panic::catch_unwind(AssertUnwindSafe(|| {
[INFO] [stdout]      |  _____________^___-
[INFO] [stdout] 1213 | |             let _m = x.borrow_mut();
[INFO] [stdout] 1214 | |             panic!("Oh no");
[INFO] [stdout] 1215 | |         }));
[INFO] [stdout]      | |___________- type must be known at this point
[INFO] [stdout]      |
[INFO] [stdout] help: consider giving `r` an explicit type, where the type for type parameter `R` is specified
[INFO] [stdout]      |
[INFO] [stdout] 1212 |         let r: Result<R, Box<dyn Any + Send>> = panic::catch_unwind(AssertUnwindSafe(|| {
[INFO] [stdout]      |              ++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rco-cell` (lib test) due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b006868471009dc807ee5d936bd7b50aad9f535eb858147ad6ff382b2f298496", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b006868471009dc807ee5d936bd7b50aad9f535eb858147ad6ff382b2f298496", kill_on_drop: false }`
[INFO] [stdout] b006868471009dc807ee5d936bd7b50aad9f535eb858147ad6ff382b2f298496