[INFO] fetching crate iflet 0.1.0...
[INFO] checking iflet-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate iflet 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate iflet 0.1.0 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 iflet 0.1.0
[INFO] finished tweaking crates.io crate iflet 0.1.0
[INFO] tweaked toml for crates.io crate iflet 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages
[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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 89af80d56a2341dd398be5a8d81b69d81f53760ee9b242157ef902a00744b9d3
[INFO] running `Command { std: "docker" "start" "-a" "89af80d56a2341dd398be5a8d81b69d81f53760ee9b242157ef902a00744b9d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89af80d56a2341dd398be5a8d81b69d81f53760ee9b242157ef902a00744b9d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89af80d56a2341dd398be5a8d81b69d81f53760ee9b242157ef902a00744b9d3", kill_on_drop: false }`
[INFO] [stdout] 89af80d56a2341dd398be5a8d81b69d81f53760ee9b242157ef902a00744b9d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 8304b4554e5c2d3254069b78305c581fe339cf717f1a2a5dd96d3c9652b112cd
[INFO] running `Command { std: "docker" "start" "-a" "8304b4554e5c2d3254069b78305c581fe339cf717f1a2a5dd96d3c9652b112cd", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking iflet v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.17s
[INFO] running `Command { std: "docker" "inspect" "8304b4554e5c2d3254069b78305c581fe339cf717f1a2a5dd96d3c9652b112cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8304b4554e5c2d3254069b78305c581fe339cf717f1a2a5dd96d3c9652b112cd", kill_on_drop: false }`
[INFO] [stdout] 8304b4554e5c2d3254069b78305c581fe339cf717f1a2a5dd96d3c9652b112cd
[INFO] checking iflet-0.1.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate iflet 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate iflet 0.1.0 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 crates.io crate iflet 0.1.0
[INFO] finished tweaking crates.io crate iflet 0.1.0
[INFO] tweaked toml for crates.io crate iflet 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 05eda3fc55df4fc9018dd51534803a7c22d0b446f8080ec8b312ed24b38da514
[INFO] running `Command { std: "docker" "start" "-a" "05eda3fc55df4fc9018dd51534803a7c22d0b446f8080ec8b312ed24b38da514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05eda3fc55df4fc9018dd51534803a7c22d0b446f8080ec8b312ed24b38da514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05eda3fc55df4fc9018dd51534803a7c22d0b446f8080ec8b312ed24b38da514", kill_on_drop: false }`
[INFO] [stdout] 05eda3fc55df4fc9018dd51534803a7c22d0b446f8080ec8b312ed24b38da514
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] af6f0bdb277796c01e1f2a6daf0b66444357585393c7b0b69b4b8c8e0bfcaaec
[INFO] running `Command { std: "docker" "start" "-a" "af6f0bdb277796c01e1f2a6daf0b66444357585393c7b0b69b4b8c8e0bfcaaec", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking iflet v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> src/lib.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         match $r {
[INFO] [stdout] 14  | |             $l $( if $c ),* => $b1
[INFO] [stdout] 15  | |             _ => $b2
[INFO] [stdout] 16  | |         }
[INFO] [stdout]     | |_________^ cannot satisfy `_ -> _`
[INFO] [stdout] ...
[INFO] [stdout] 125 | /     if_chain!([let Some(a) => x,
[INFO] [stdout] 126 | |                let Ok(b) => y,
[INFO] [stdout] 127 | |                let (c, d) => z] {
[INFO] [stdout] 128 | |         assert_eq!(a, 3);
[INFO] [stdout] ...   |
[INFO] [stdout] 134 | |         panic!("match failed when success was expected");
[INFO] [stdout] 135 | |     });
[INFO] [stdout]     | |______- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `if_chain` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> src/lib.rs:13:9
[INFO] [stdout]     |
[INFO] [stdout] 13  | /         match $r {
[INFO] [stdout] 14  | |             $l $( if $c ),* => $b1
[INFO] [stdout] 15  | |             _ => $b2
[INFO] [stdout] 16  | |         }
[INFO] [stdout]     | |_________^ cannot satisfy `_ -> _`
[INFO] [stdout] ...
[INFO] [stdout] 275 | /     if_chain!([let Some(a) => x,
[INFO] [stdout] 276 | |                let Ok(b) if !b.is_empty() => y,
[INFO] [stdout] 277 | |                let (c, d) if d < 0 => z] {
[INFO] [stdout] 278 | |         assert_eq!(a, 3);
[INFO] [stdout] ...   |
[INFO] [stdout] 284 | |         panic!("match failed when success was expected");
[INFO] [stdout] 285 | |     });
[INFO] [stdout]     | |______- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `if_chain` (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 E0284`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iflet` (lib test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "af6f0bdb277796c01e1f2a6daf0b66444357585393c7b0b69b4b8c8e0bfcaaec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af6f0bdb277796c01e1f2a6daf0b66444357585393c7b0b69b4b8c8e0bfcaaec", kill_on_drop: false }`
[INFO] [stdout] af6f0bdb277796c01e1f2a6daf0b66444357585393c7b0b69b4b8c8e0bfcaaec