[INFO] fetching crate json_keyquotes_convert 0.2.3...
[INFO] checking json_keyquotes_convert-0.2.3 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate json_keyquotes_convert 0.2.3 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate json_keyquotes_convert 0.2.3 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 json_keyquotes_convert 0.2.3
[INFO] finished tweaking crates.io crate json_keyquotes_convert 0.2.3
[INFO] tweaked toml for crates.io crate json_keyquotes_convert 0.2.3 written to /workspace/builds/worker-4-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 7 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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] da9f4c38a7e16a35dddab7ff06bc41de950d7b4ffd8b67d3a0a262c557a0ade2
[INFO] running `Command { std: "docker" "start" "-a" "da9f4c38a7e16a35dddab7ff06bc41de950d7b4ffd8b67d3a0a262c557a0ade2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da9f4c38a7e16a35dddab7ff06bc41de950d7b4ffd8b67d3a0a262c557a0ade2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da9f4c38a7e16a35dddab7ff06bc41de950d7b4ffd8b67d3a0a262c557a0ade2", kill_on_drop: false }`
[INFO] [stdout] da9f4c38a7e16a35dddab7ff06bc41de950d7b4ffd8b67d3a0a262c557a0ade2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 57b42fdab0c7794458970ce4a2352c30c5716b0535af2baa4f0443670872f4cf
[INFO] running `Command { std: "docker" "start" "-a" "57b42fdab0c7794458970ce4a2352c30c5716b0535af2baa4f0443670872f4cf", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking json_keyquotes_convert v0.2.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "57b42fdab0c7794458970ce4a2352c30c5716b0535af2baa4f0443670872f4cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57b42fdab0c7794458970ce4a2352c30c5716b0535af2baa4f0443670872f4cf", kill_on_drop: false }`
[INFO] [stdout] 57b42fdab0c7794458970ce4a2352c30c5716b0535af2baa4f0443670872f4cf
[INFO] checking json_keyquotes_convert-0.2.3 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate json_keyquotes_convert 0.2.3 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate json_keyquotes_convert 0.2.3 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 json_keyquotes_convert 0.2.3
[INFO] finished tweaking crates.io crate json_keyquotes_convert 0.2.3
[INFO] tweaked toml for crates.io crate json_keyquotes_convert 0.2.3 written to /workspace/builds/worker-4-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]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 15f6a3399c2f7cc08ab44328a5be3cf44caecc2a17c1e8f2ab926a59f53a1f84
[INFO] running `Command { std: "docker" "start" "-a" "15f6a3399c2f7cc08ab44328a5be3cf44caecc2a17c1e8f2ab926a59f53a1f84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15f6a3399c2f7cc08ab44328a5be3cf44caecc2a17c1e8f2ab926a59f53a1f84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15f6a3399c2f7cc08ab44328a5be3cf44caecc2a17c1e8f2ab926a59f53a1f84", kill_on_drop: false }`
[INFO] [stdout] 15f6a3399c2f7cc08ab44328a5be3cf44caecc2a17c1e8f2ab926a59f53a1f84
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 7b4da4fbf5bf9c5fadca22e88b473bb119ed3f1a21b80884944c160249529bf7
[INFO] running `Command { std: "docker" "start" "-a" "7b4da4fbf5bf9c5fadca22e88b473bb119ed3f1a21b80884944c160249529bf7", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking json_keyquotes_convert v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/load_write_utils.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     match fs::read_to_string(path) {
[INFO] [stdout] 22 | |         Ok(val) => return Ok(val),
[INFO] [stdout] 23 | |         Err(err) => return Err(err),
[INFO] [stdout] 24 | |     };
[INFO] [stdout]    | |_____^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/load_write_utils.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     match fs::read_to_string(path) {
[INFO] [stdout] 22 | |         Ok(val) => return Ok(val),
[INFO] [stdout] 23 | |         Err(err) => return Err(err),
[INFO] [stdout] 24 | |     };
[INFO] [stdout]    | |_____^ cannot infer type
[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] [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 `json_keyquotes_convert` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `json_keyquotes_convert` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "7b4da4fbf5bf9c5fadca22e88b473bb119ed3f1a21b80884944c160249529bf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b4da4fbf5bf9c5fadca22e88b473bb119ed3f1a21b80884944c160249529bf7", kill_on_drop: false }`
[INFO] [stdout] 7b4da4fbf5bf9c5fadca22e88b473bb119ed3f1a21b80884944c160249529bf7